2,230 results match your criteria Chalcogenide Letters[Journal]


Universal Precise Growth of 2D Transition Metal Dichalcogenides in Vertical Direction.

ACS Appl Mater Interfaces 2020 Jul 10. Epub 2020 Jul 10.

Two-dimensional transition metal dichalcogenides (TMDs) have been one of the hottest focus of materials due to the most beneficial electronic and optoelectronic properties. Up to now, one of the big challenges is synthesis of large-area layer-number-controlled single crystal films. However, the poorly understanding of growth mechanism seriously hampers the progress of scalable production of TMDs with precisely tunable thickness at the atomic scale. Read More

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http://dx.doi.org/10.1021/acsami.0c08335DOI Listing

Boson band mapping: revealing ultrafast laser induced structural modifications in chalcogenide glass.

Opt Lett 2020 Jul;45(13):3369-3372

The formation of femtosecond laser direct-written waveguides in gallium lanthanum sulfide (GLS) chalcogenide glass with a peak index contrast of =0.023 and an average positive refractive index change of =0.0049 is explained for the first time, to the best of our knowledge. Read More

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http://dx.doi.org/10.1364/OL.393511DOI Listing

Exploration of the Interaction Strength at the Interface of Anionic Chalcogen Anchors and Gold (111)-Based Nanomaterials.

Nanomaterials (Basel) 2020 Jun 25;10(6). Epub 2020 Jun 25.

Departamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago PO 7800003, Chile.

Nowadays, the use of sulfur-based ligands to modify gold-based materials has become a common trend. Here, we present a theoretical exploration of the modulation of the chalcogenides-gold interaction strength, using sulfur, selenium, and tellurium as anchor atoms. To characterize the chalcogenide-gold interaction, we designed a nanocluster of 42 gold atoms (Au) to model a gold surface (111) and a series of 60 functionalized phenyl-chalcogenolate ligands to determine the ability of electron-donor and -withdrawing groups to modulate the interaction. Read More

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http://dx.doi.org/10.3390/nano10061237DOI Listing

Topologically Nontrivial Phase-Change Compound GeSbTe.

ACS Nano 2020 Jul 6. Epub 2020 Jul 6.

Department of Physical Sciences, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan.

Chalcogenide phase-change materials show strikingly contrasting optical and electrical properties, which has led to their extensive implementation in various memory devices. By performing spin-, time-, and angle-resolved photoemission spectroscopy combined with the first-principles calculation, we report the experimental results that the crystalline phase of GeSbTe is topologically nontrivial in the vicinity of the Dirac semimetal phase. The resulting linearly dispersive bulk Dirac-like bands that cross the Fermi level and are thus responsible for conductivity in the stable crystalline phase of GeSbTe can be viewed as a 3D analogue of graphene. Read More

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http://dx.doi.org/10.1021/acsnano.0c04145DOI Listing

Optical emission spectroscopy of lead sulfide films plasma deposition.

Spectrochim Acta A Mol Biomol Spectrosc 2020 Jun 20;241:118629. Epub 2020 Jun 20.

Nizhny Novgorod State Technical University n.a. R.E. Alekseev, Nizhny Novgorod, Russia.

In-situ Optical Emission Spectroscopy (OES) combined with quantum chemical calculations was used as a powerful tool to find out the exited reactive species existing in plasma discharge during the process of lead sulfide chalcogenide materials deposition. Low temperature nonequilibrium RF (40.68 MHz) plasma at low pressure (0. Read More

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http://dx.doi.org/10.1016/j.saa.2020.118629DOI Listing

Modified Lennard-Jones potentials for nanoscale atoms.

J Comput Chem 2020 Aug 27;41(22):1985-2000. Epub 2020 Jun 27.

Department of Physics, The MacDiarmid Institute for Advanced Materials and Nanotechnology, The University of Auckland, Auckland, New Zealand.

A classical 6-12 Lennard-Jones (LJ) equation has been widely used to model materials and is the potential of choice in studies when the focus is on fundamental issues. Here we report a systematic study comparing the pair interaction potentials within solid-state materials (i.e. Read More

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http://dx.doi.org/10.1002/jcc.26368DOI Listing

Nonvolatile Electrically Reconfigurable Integrated Photonic Switch Enabled by a Silicon PIN Diode Heater.

Adv Mater 2020 Jun 26:e2001218. Epub 2020 Jun 26.

Department of Electrical and Computer Engineering, University of Washington, Seattle, WA, 98195, USA.

Reconfigurability of photonic integrated circuits (PICs) has become increasingly important due to the growing demands for electronic-photonic systems on a chip driven by emerging applications, including neuromorphic computing, quantum information, and microwave photonics. Success in these fields usually requires highly scalable photonic switching units as essential building blocks. Current photonic switches, however, mainly rely on materials with weak, volatile thermo-optic or electro-optic modulation effects, resulting in large footprints and high energy consumption. Read More

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http://dx.doi.org/10.1002/adma.202001218DOI Listing

Near-Infrared Rewritable, Non-Volatile Subwavelength Absorber Based on Chalcogenide Phase Change Materials.

Nanomaterials (Basel) 2020 Jun 23;10(6). Epub 2020 Jun 23.

College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China.

Chalcogenide phase change materials enable the realization of novel, non-volatile, switchable electronic and photonic devices. In this paper, we propose a type of rewritable, non-volatile near infrared subwavelength absorber based on chalcogenide phase change materials. Our numerical simulations show that nearly perfect absorption more than 0. Read More

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http://dx.doi.org/10.3390/nano10061222DOI Listing

Inverse Design of Ultralow Lattice Thermal Conductivity Materials via Materials Database Screening of Lone Pair Cation Coordination Environment.

J Phys Chem Lett 2020 Jul 1:5577-5583. Epub 2020 Jul 1.

Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States.

The presence of lone pair (LP) electrons is strongly associated with the disruption of lattice heat transport, which is a critical component of strategies to achieve efficient thermoelectric energy conversion. By exploiting an empirical relationship between lattice thermal conductivity, κ, and the bond angles of pnictogen group LP cation coordination environments, we develop an inverse design strategy based on a materials database screening to identify chalcogenide materials with ultralow κ for thermoelectrics. Screening the ∼635 000 real and hypothetical inorganic crystals of the Open Quantum Materials Database based on the constituent elements, nominal electron counting, LP cation coordination environment, and synthesizability, we identify 189 compounds expected to exhibit ultralow κ. Read More

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http://dx.doi.org/10.1021/acs.jpclett.0c01077DOI Listing

Glassy Flux Protocol to Confine Lead-Free CsSnX Nanocrystals Into Transparent Solid Medium.

J Phys Chem Lett 2020 Jun 23. Epub 2020 Jun 23.

Encapsulation of halide perovskites into transparent solid medium is important for increasing their stability and rendering the exploration of new optoelectronic application. Here, we describe a glassy flux protocol to confine lead-free cesium tin halide (CsSnX3) perovskite nanocrystals into transparent chalcogenide glassy matrix by capitalizing on judiciously designed germanium-antimony-sulfur chalcogenide flux as solvent to dissolve and re-crystallize the target crystal phases. We show that CsSnX3 nanocrystals can be obtained in form of spherical shape, single crystalline, and arbitrary halide ratio through use of cesium halide and tin(II) halide at precisely defined concentrations. Read More

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http://dx.doi.org/10.1021/acs.jpclett.0c01382DOI Listing

Few-moded ultralarge mode area chalcogenide photonic crystal fiber for mid-infrared high power applications.

Opt Express 2020 May;28(11):16658-16672

We demonstrate a novel few-moded ultralarge mode area chalcogenide glass photonic crystal fiber for mid-infrared high power applications. The numerical simulation indicates that the fiber has ultralarge mode areas of ∼10500 µm and ∼12000 µm for the fundamental mode LP and the lowest higher-order mode LP, respectively. Dual-moded operation is confirmed experimentally at 2 µm, in good agreement with the numerical simulation. Read More

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http://dx.doi.org/10.1364/OE.389507DOI Listing

Permanent tuning of optical resonant modes of chalcogenide-coated microresonators.

Appl Opt 2020 Jun;59(16):4814-4820

Chalcogenide materials are promising for optical resonant mode tuning of whispering gallery mode (WGM) microresonators due to their high nonlinearity. In this study, this phenomenon was demonstrated for -coated toroidal microresonators using an optical postprocess, which utilizes the intrinsically photosensitive property of the coating. A signal laser was used to illuminate the resonator for permanent tuning of the WGMs in a sensitive manner. Read More

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http://dx.doi.org/10.1364/AO.392924DOI Listing

Stimulated Brillouin scattering in a tapered dual-core AsSe-PMMA fiber for simultaneous temperature and strain sensing.

Opt Lett 2020 Jun;45(12):3301-3304

Chalcogenide fibers are currently being used widely in nonlinear optical signal processing, as they exhibit ultrahigh nonlinearity. Here, we propose a sensor based on stimulated Brillouin scattering for simultaneous temperature and strain measurement in a dual-core tapered -polymethyl methacrylate fiber using a Brillouin optical time-domain analysis system. Different Brillouin frequency responses under temperature and strain variations and the separation of Brillouin frequency shifts (BFSs) in two principal polarization axes are demonstrated experimentally over a 50-cm-long tapered dual-core hybrid microfiber. Read More

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http://dx.doi.org/10.1364/OL.391734DOI Listing

Effects of disorder on two-photon absorption in amorphous semiconductors.

Opt Lett 2020 Jun;45(12):3228-3231

Structural disorder inherent to amorphous materials affords them unique, tailorable properties desirable for diverse applications, but our ability to exploit these phenomena is limited by a lack of understanding of complex structure-property relationships. Here we focus on nonlinear optical absorption and derive a relationship between disorder and the two-photon absorption (2PA) coefficient. We employ an open-aperture Z-scan to measure the 2PA spectra of arsenic (III) sulfide () chalcogenide glass films processed with two solvents that impart different levels of structural disorder. Read More

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http://dx.doi.org/10.1364/OL.391197DOI Listing

Changes of Structure and Bonding with Thickness in Chalcogenide Thin Films.

Adv Mater 2020 Jun 14:e2001033. Epub 2020 Jun 14.

Institute for Theoretical Solid State Physics, JARA-FIT and JARA-HPC, RWTH Aachen University, Aachen, D-52074, Germany.

Extreme miniaturization is known to be detrimental for certain properties, such as ferroelectricity in perovskite oxide films below a critical thickness. Remarkably, few-layer crystalline films of monochalcogenides display robust in-plane ferroelectricity with potential applications in nanoelectronics. These applications critically depend on the electronic properties and the nature of bonding in the 2D limit. Read More

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http://dx.doi.org/10.1002/adma.202001033DOI Listing

In Situ Reaction Induced Core-Shell Structure to Ultralow κ and High Thermoelectric Performance of SnTe.

Adv Sci (Weinh) 2020 Jun 16;7(11):1903493. Epub 2020 Apr 16.

State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan 430074 P. R. China.

Lead-free chalcogenide SnTe has been demonstrated to be an efficient medium temperature thermoelectric (TE) material. However, high intrinsic Sn vacancies as well as high thermal conductivity devalue its performance. Here, β-ZnSb is incorporated into the SnTe matrix to regulate the thermoelectric performance of SnTe. Read More

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http://dx.doi.org/10.1002/advs.201903493DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7284213PMC

Use of Chalcogenide-Semiconductor-Sensitized Titania to Directly Charge a Vanadium Redox Battery.

Nanomaterials (Basel) 2020 Jun 9;10(6). Epub 2020 Jun 9.

Department of Chemical Engineering, University of Patras, 26500 Patras, Greece.

Unmediated charging of a battery using solar radiation is a very attractive project of solar energy conversion and storage. In the present work, solar energy was converted into electricity using a photocatalytic fuel cell operating with a chalcogenide-semiconductor-sensitized nanoparticulate titania photoanode and an air-cathode functioning by oxygen reduction. This cell produced sufficient energy to directly charge a vanadium redox battery functioning with a VOSO electrolyte and carbon paper electrodes. Read More

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http://dx.doi.org/10.3390/nano10061137DOI Listing

Internally functionalized multifaceted organochalcogen compounds.

Authors:
Vimal K Jain

Dalton Trans 2020 Jul;49(26):8817-8835

UM-DAE Centre for Excellence in Basic Sciences, Nalanda Building, University of Mumbai, Kalina Campus, Santacruz (E), Mumbai-400 098, India.

Two families of internally functionalized multifaceted organochalcogen compounds based on flexible and rigid backbones, viz., N,N-dimethylaminoalkyl and pyridyl/pryrimidyl groups, have been designed and developed in the author's group. These compounds exhibit remarkable ligand chemistry and often show unprecedented reactivity leading to the formation of several serendipitous products. Read More

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http://dx.doi.org/10.1039/d0dt01160fDOI Listing

Tunable Grain Orientation of Chalcogenide Film and Its Application for Second Harmonic Generation.

ACS Appl Mater Interfaces 2020 Jul 22;12(26):29953-29958. Epub 2020 Jun 22.

School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.

To date, the second harmonic generation (SHG) has a great effect on photonic devices. However, it is a formidable challenge to achieve reconfigurable SHG. Hereby, we experimentally demonstrate the SHG response from the oriented GeSbTe (GST) grains induced by polarized laser pulses for the first time. Read More

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http://dx.doi.org/10.1021/acsami.0c05082DOI Listing

Insight into the interfacial stability and reaction mechanism between gaseous mercury and chalcogen-based sorbents in SO-containing flue gas.

J Colloid Interface Sci 2020 May 28;577:503-511. Epub 2020 May 28.

School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.

Chalcogen-based materials have been confirmed to possess large adsorption capacities for gaseous elemental mercury (Hg) from SO-containing flue gas. However, the interface reaction mechanisms and the interfacial stability are still ambiguous. Here, we selected some commonly used chalcogen-based sorbents (e. Read More

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http://dx.doi.org/10.1016/j.jcis.2020.05.072DOI Listing

Emergence of Topologically Nontrivial Spin-Polarized States in a Segmented Linear Chain.

Phys Rev Lett 2020 May;124(20):206403

Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.

The synthesis of new materials with novel or useful properties is one of the most important drivers in the fields of condensed matter physics and materials science. Discoveries of this kind are especially significant when they point to promising future basic research and applications. van der Waals bonded materials comprised of lower-dimensional building blocks have been shown to exhibit emergent properties when isolated in an atomically thin form [1-8]. Read More

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http://dx.doi.org/10.1103/PhysRevLett.124.206403DOI Listing

Strategies for Chalcogenide Thin Film Functionalization.

Langmuir 2020 Jul 23;36(26):7691-7700. Epub 2020 Jun 23.

L2C, Univ Montpellier, CNRS, Place Eugène Bataillon-CC074, F-34095 Montpellier Cedex 5, France.

We report the functionalization of chalcogenide thin films with biotinylated 12-mer peptides SVSVGMKPSPRP and LLADTTHHRPWT exhibiting a high binding affinity toward inorganic surfaces, on the one hand, and with (3-aminopropyl)triethoxysilane (APTES), on the other hand. The specific biotin moieties were used to bind streptavidin proteins and demonstrate the efficacy of the biofunctionalizated chalcogenide thin films to capture biomolecules. Atomic force microscopy provided high-resolution images of the interfaces, and water contact angle measurements gave insight into the interaction mechanisms. Read More

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http://dx.doi.org/10.1021/acs.langmuir.0c01328DOI Listing

A Solution-based Method for Synthesizing Pyrite-type Ferrous Metal Sulfide Microspheres with Efficient OER Activity.

Chem Asian J 2020 Jun 4. Epub 2020 Jun 4.

School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin, 300072, China.

Simple and stable synthesis of transition metal sulfides and clarification of their growth mechanisms are of great importance for developing catalysts, metal-air batteries and other technologies. In this work, we developed a one-step facile hydrothermal approach to successfully synthesize NiS microspheres. By changing the experimental parameters, the reason that affects the formation of nanostructured spheres is investigated and discussed in detail, and the formation mechanism of microspheres is proposed innovatively. Read More

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http://dx.doi.org/10.1002/asia.202000504DOI Listing

Chimeric supramolecular synthons in PhTe(I)Se.

Authors:
Yury V Torubaev

Acta Crystallogr C Struct Chem 2020 Jun 18;76(Pt 6):579-584. Epub 2020 May 18.

N.S. Kurnakov Institute of General and Inorganic Chemistry of Russian Academy of Sciences (IGIC RAS), Moscow, Russian Federation.

Iodination of PhTeSe by molecular iodine is directed towards the Te atom and yields {diiodo[(phenyltellanyl)selanyl]-λ-tellanyl}benzene, PhTeSeTeIPh or CHISeTe. The molecule can be considered as a chimera of PhTeSeR, PhTeSeTePh and R'TeIPh fragments. The crystal structure features a complex interplay of the supramolecular synthons Te. Read More

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http://dx.doi.org/10.1107/S2053229620006166DOI Listing

Low-temperature synthesis and electrocatalytic application of large-area PtTe thin films.

Nanotechnology 2020 Sep 4;31(37):375601. Epub 2020 Jun 4.

School of Chemistry, Trinity College Dublin, Dublin 2 D02 PN40, Ireland. AMBER Centre, CRANN Institute, Trinity College Dublin, Dublin 2 D02 PN40, Ireland.

The synthesis of transition metal dichalcogenides (TMDs) has been a primary focus for 2D nanomaterial research over the last 10 years, however, only a small fraction of this research has been concentrated on transition metal ditellurides. In particular, nanoscale platinum ditelluride (PtTe) has rarely been investigated, despite its potential applications in catalysis, photonics and spintronics. Of the reports published, the majority examine mechanically-exfoliated flakes from chemical vapor transport (CVT) grown crystals. Read More

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http://dx.doi.org/10.1088/1361-6528/ab9973DOI Listing
September 2020

Transformation of Colloidal Quantum Dot: From Intraband Transition to Localized Surface Plasmon Resonance.

Nano Lett 2020 Jul 9;20(7):4985-4992. Epub 2020 Jun 9.

Department of Chemistry, Korea University, Seoul 02841 Republic of Korea.

An increase in the carrier density of semiconductor nanocrystals can gradually change the origin of the optical property from the excitonic transition to the localized surface plasmon resonances. Here, we present the evolution of the electronic transition of self-doped AgSe colloidal quantum dots, from the intraband transition to the localized surface plasmon resonances along with a splitting of the intraband transition (1P-1S). The minimum fwhm of the split intraband transition is only 23. Read More

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http://dx.doi.org/10.1021/acs.nanolett.0c01080DOI Listing

Te Nanoneedles Induced Entanglement and Thermoelectric Improvement of SnSe.

Materials (Basel) 2020 Jun 1;13(11). Epub 2020 Jun 1.

School of Chemical Engineering & Materials Science, Chung-Ang University, Seoul 06974, Korea.

Chalcogenide-based materials have attracted widespread interest in high-performance thermoelectric research fields. A strategy for the application of two types of chalcogenide for improved thermoelectric performance is described herein. Tin selenide (SnSe) is used as a base material, and Te nanoneedles are crystallized in the SnSe, resulting in the generation of a composite structure of SnSe with Te nanoneedles. Read More

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http://dx.doi.org/10.3390/ma13112523DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7321485PMC

Reversible Electrochemical Gelation of Metal Chalcogenide Quantum Dots.

J Am Chem Soc 2020 Jun 16. Epub 2020 Jun 16.

Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States.

The ability to dictate the assembly of quantum dots (QDs) is critical for their integration into solid-state electronic and optoelectronic devices. However, assembly methods that enable efficient electronic communication between QDs, facilitate access to the reactive surface, and retain the native quantum confinement characteristics of the QD are lacking. Here we introduce a universal and facile electrochemical gelation method for assembling metal chalcogenide QDs (as demonstrated for CdS, ZnS, and CdSe) into macroscale 3-D connected pore-matter nanoarchitectures that remain quantum confined and in which each QD is accessible to the ambient. Read More

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http://dx.doi.org/10.1021/jacs.0c03156DOI Listing

Low-noise octave-spanning mid-infrared supercontinuum generation in a multimode chalcogenide fiber.

Opt Lett 2020 Jun;45(11):3103-3106

We demonstrate the generation of a low-noise, octave-spanning mid-infrared supercontinuum from 1700 to 4800 nm by injecting femtosecond pulses into the normal dispersion regime of a multimode step-index chalcogenide fiber with 100 µm core diameter. We conduct a systematic study of the intensity noise across the supercontinuum spectrum and show that the initial fluctuations of the pump laser are at most amplified by a factor of three. We also perform a comparison with the noise characteristics of an octave-spanning supercontinuum generated in the anomalous dispersion regime of a multimode fluoride fiber with similar core size and show that the normal dispersion supercontinuum in the multimode chalcogenide fiber has superior noise characteristics. Read More

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http://dx.doi.org/10.1364/OL.392282DOI Listing

Second-Order Nonlinear-Optical-Active Selenide Borate YSeBO: Featuring a [YSeBO] Planar Belt.

Inorg Chem 2020 Jun 29;59(12):7905-7909. Epub 2020 May 29.

School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, P. R. China.

Chalcogenide borates were very rarely investigated in the past. As the second selenide borate, YSeBO obtained by a high-temperature solid-state reaction crystallizes in the noncentrosymmetric orthorhombic space group 2 with a novel structure type. Its structure consists of two basic building units, [BO] planar triangles and [YOSe] pentagonal bipyramids, and features the [YSeBO] planar belt. Read More

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http://dx.doi.org/10.1021/acs.inorgchem.0c00753DOI Listing

Crystal Structure and Electronic Properties of New Compound ZrPtSe.

Inorg Chem 2020 Jun 27;59(12):8196-8202. Epub 2020 May 27.

Department of Physics, The University of Texas at Dallas, Richardson, Texas 75080, United States.

A new ternary nonstoichiometric ZrPtSe has been discovered as a part of effort to dope Zr into the layered transitional metal chalcogenide PtSe. With a new structure type (68), it is the first Pt-based ternary chalcogenide with group 4 elements (Ti, Zr, and Hf). The crystal structure adopts the orthorhombic space group with lattice parameters of = 15. Read More

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http://dx.doi.org/10.1021/acs.inorgchem.0c00522DOI Listing

Chemical Bonding in Chalcogenides: The Concept of Multicenter Hyperbonding.

Adv Mater 2020 May 27:e2000340. Epub 2020 May 27.

Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.

The precise nature of chemical-bonding interactions in amorphous, and crystalline, chalcogenides is still unclear due to the complexity arising from the delocalization of bonding, and nonbonding, electrons. Although an increasing degree of electron delocalization for elements down a column of the periodic table is widely recognized, its influence on chemical-bonding interactions, and on consequent material properties, of chalcogenides has not previously been comprehensively understood from an atomistic point of view. Here, a chemical-bonding framework is provided for understanding the behavior of chalcogenides (and, in principle, other lone-pair materials) by studying prototypical telluride nonvolatile-memory, "phase-change" materials (PCMs), and related chalcogenide compounds, via density-functional-theory molecular-dynamics (DFT-MD) simulations. Read More

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http://dx.doi.org/10.1002/adma.202000340DOI Listing

Analyzing and Tuning the Chalcogen-Amine-Thiol Complexes for Tailoring of Chalcogenide Syntheses.

Inorg Chem 2020 Jun 22;59(12):8240-8250. Epub 2020 May 22.

Davidson School of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, Indiana 47907, United States.

The amine-thiol solvent system has been used extensively to synthesize metal chalcogenide thin films and nanoparticles because of its ability to dissolve various metal and chalcogen precursors. While previous studies of this solvent system have focused on understanding the dissolution of metal precursors, here we provide an in-depth investigation of the dissolution of chalcogens, specifically Se and Te. Analytical techniques, including Raman, X-ray absorption, and NMR spectroscopy and high-resolution tandem mass spectrometry, were used to identify pathways for Se and Te dissolution in butylamine-ethanethiol and ethylenediamine-ethanethiol solutions. Read More

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http://dx.doi.org/10.1021/acs.inorgchem.0c00597DOI Listing

Expression and interactions of stereochemically active lone pairs and their relation to structural distortions and thermal conductivity.

IUCrJ 2020 May 31;7(Pt 3):480-489. Epub 2020 Mar 31.

Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, Aarhus 8000, Denmark.

In chemistry, stereochemically active lone pairs are typically described as an important non-bonding effect, and recent interest has centred on understanding the derived effect of lone pair expression on physical properties such as thermal conductivity. To manipulate such properties, it is essential to understand the conditions that lead to lone pair expression and provide a quantitative chemical description of their identity to allow comparison between systems. Here, density functional theory calculations are used first to establish the presence of stereochemically active lone pairs on antimony in the archetypical chalcogenide MnSbO. Read More

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http://dx.doi.org/10.1107/S2052252520003619DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7201275PMC

Quantum dot (QD)-based probes for multiplexed determination of heavy metal ions.

Mikrochim Acta 2020 May 19;187(6):336. Epub 2020 May 19.

Advanced Manufacturing and Fabrication, School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia.

Heavy metal contamination is a major global concern and additive toxicity resulting from the exposure to multiple heavy metal ions is more pronounced than that induced by a single metal species. Quantum dots (QDs) have demonstrated unique properties as sensing materials for heavy metal ions over the past two decades. With the rapid development and deep understanding on determination of single heavy metal ion using QD probes, this technology has been employed for sensing multiple metal ions. Read More

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http://dx.doi.org/10.1007/s00604-020-04297-5DOI Listing

Colloidal crystal engineering with metal-organic framework nanoparticles and DNA.

Nat Commun 2020 May 19;11(1):2495. Epub 2020 May 19.

Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA.

Colloidal crystal engineering with nucleic acid-modified nanoparticles is a powerful way for preparing 3D superlattices, which may be useful in many areas, including catalysis, sensing, and photonics. To date, the building blocks studied have been primarily based upon metals, metal oxides, chalcogenide semiconductors, and proteins. Here, we show that metal-organic framework nanoparticles (MOF NPs) densely functionalized with oligonucleotides can be programmed to crystallize into a diverse set of superlattices with well-defined crystal symmetries and compositions. Read More

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http://dx.doi.org/10.1038/s41467-020-16339-wDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7237412PMC

Heteroleptic Samarium(III) Chalcogenide Complexes: Opportunities for Giant Exchange Coupling in Bridging σ- and π-Radical Lanthanide Dichalcogenides.

Inorg Chem 2020 Jun 18;59(11):7571-7583. Epub 2020 May 18.

WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, United Kingdom.

The introduction of (N) radicals into multinuclear lanthanide molecular magnets raised hysteresis temperatures by stimulating strong exchange coupling between spin centers. Radical ligands with larger donor atoms could promote more efficient magnetic coupling between lanthanides to provide superior magnetic properties. Here, we show that heavy chalcogens (S, Se, Te) are primed to fulfill these criteria. Read More

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http://dx.doi.org/10.1021/acs.inorgchem.0c00470DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7268190PMC

Synergistic optimization of thermoelectric performance in earth-abundant CuZnSnS by inclusion of graphene nanosheets.

Nanotechnology 2020 Sep 15;31(36):365402. Epub 2020 May 15.

University School of Basic and Applied Sciences, Guru Gobind Singh Indraprastha University, Dwarka, Delhi 110078, India.

Earth-abundant quaternary chalcogenide semiconductors with complex structures, such as copper zinc tin sulphide (CuZnSnS; CZTS), have the potential to become economic and non-toxic thermoelectric materials. However, the inferior power factor of CZTS, due to its insignificant electrical conductivity, negates the advantage of inherent small thermal conductivity. In the present report, the thermoelectric properties of CZTS composites integrated with graphene nanosheets (GNs) CZTS/x (x = 0. Read More

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http://dx.doi.org/10.1088/1361-6528/ab9393DOI Listing
September 2020
3.821 Impact Factor

Etchless chalcogenide microresonators monolithically coupled to silicon photonic waveguides.

Opt Lett 2020 May;45(10):2830-2833

Integration of chalcogenide waveguides in silicon photonics can mitigate the prohibitive nonlinear losses of silicon while leveraging the mature complementary metal-oxide-semiconductor (CMOS)-compatible nanophotonic fabrication process. In this work, we demonstrate, for the first time, to the best of our knowledge, a method of integrating high- chalcogenides microring resonators onto the silicon photonics platform without post-process etching. The method uses micro-trench filling and a novel thermal dewetting technique to form low-loss chalcogenide strip waveguides. Read More

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http://dx.doi.org/10.1364/OL.392879DOI Listing

Molecules versus Nanoparticles: Identifying a Reactive Molecular Intermediate in the Synthesis of Ternary Coinage Metal Chalcogenides.

Inorg Chem 2020 Jun 15;59(11):7727-7738. Epub 2020 May 15.

Institut de Recherches sur la Catalyse et l'Environnement de Lyon (IRCELYON), Université Lyon, Université Claude Bernard Lyon 1, CNRS, UMR 5256, 2 avenue Albert Einstein, 69626 Villeurbanne, France.

The identification of reactive intermediates during molecule-to-nanoparticle (NP) transformation has great significance in comprehending the mechanism of NP formation and, therefore, optimizing the synthetic conditions and properties of the formed products. We report here the room temperature (RT) synthesis of AgCuSe NPs from the reaction of di--butyl selenide with trifluoroacetates (TFA) of silver(I) and copper(II). The isolation and characterization of a molecular species during the course of this reaction, [AgCu(TFA)(BuSe)] (), which shows extraordinary reactivity and interesting thermochromic behavior (blue at 0 °C and green at RT), confirmed that ternary metal selenide NPs are formed via this intermediate species. Read More

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http://dx.doi.org/10.1021/acs.inorgchem.0c00758DOI Listing

Functional Chalcogenide NaHgSnSe and KMnGeSe Exhibiting Flexible Chain Structure and Intriguing Birefringence Tunability.

Inorg Chem 2020 Jun 15;59(11):7614-7621. Epub 2020 May 15.

Beijing Center for Crystal Research and Development, Key Lab of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.

The two functional chalcogenides KMnGeSe and NaHgSnSe, featuring a straight-chain structure, have been successfully prepared and fully characterized. KMnGeSe shows paramagnetic behavior. The birefringence of NaHgSnSe is as large as 0. Read More

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http://dx.doi.org/10.1021/acs.inorgchem.0c00490DOI Listing

Enhanced Water Dispersibility of Discrete Chalcogenide Nanoclusters with a Sodalite-Net Loose-Packing Pattern in a Crystal Lattice.

Inorg Chem 2020 May 15. Epub 2020 May 15.

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, China.

Good aqueous dispersibility of metal chalcogenide nanoclusters with an atomically precise structure is desirable to achieve tiny and uniform cluster-based "quantum dots". However, there are big challenges toward this goal, especially for the large-sized nanoclusters without covalently bonded organic ligands, because the strong electrostatic interactions between closely packed negatively charged nanoclusters and protonated organic amine templates in the crystal lattice impede the dispersion of cluster-based bulk crystalline samples. Here, we report two iso-structured crystalline metal chalcogenides composed of discrete supertetrahedral T4-MInS nanoclusters with the formulas of [MInS] (denoted M, M = Zn and Fe), which adopt a sodalite-net loose-packing pattern in the crystal lattice and display superior dispersibility in water and some organic solvents as compared to other cases composed of the same type of nanoclusters with close-packing pattern. Read More

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http://dx.doi.org/10.1021/acs.inorgchem.0c00621DOI Listing
May 2020
4.762 Impact Factor

Comparative study of Er-doped Ga-Ge-Sb-S thin films fabricated by sputtering and pulsed laser deposition.

Sci Rep 2020 May 14;10(1):7997. Epub 2020 May 14.

Department of Graphic Arts and Photophysics, Faculty of Chemical Technology, University of Pardubice, 53210, Pardubice, Czech Republic.

Despite the renewed interest in rare earth-doped chalcogenide glasses lying mainly in mid-infrared applications, a few comprehensive studies so far have presented the photoluminescence of amorphous chalcogenide films from visible to mid-infrared. This work reports the fabrication of luminescent quaternary sulfide thin films using radio-frequency sputtering and pulsed laser deposition, and the characterization of their chemical composition, morphology, structure, refractive index and Er photoluminescence. The study of ErI level lifetimes enables developing suitable deposition parameters; the dependency of composition, structural and spectroscopic properties on deposition parameters provides a way to tailor the RE-doped thin film properties. Read More

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http://dx.doi.org/10.1038/s41598-020-64092-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7224381PMC

Electrocatalytic proton-reduction behaviour of telluride-capped triiron clusters: tuning of overpotentials and stabilization of redox states relative to lighter chalcogenide analogues.

Dalton Trans 2020 Jun;49(21):7133-7143

Department of Chemistry, King's College London, Britannia House, 7 Trinity Street, London SE1 1DB, UK.

Reaction of [Fe3(CO)9(μ3-Te)2] (1) with the corresponding phosphine has been used to prepare the phosphine-substituted tellurium-capped triiron clusters [Fe3(CO)9(μ3-Te)2(PPh3)] (2), [Fe3(CO)8(μ3-Te)2(PPh3)] (3) and [Fe3(CO)7(μ3-Te)2(μ-R2PXPR2)] (X = CH2, R = Ph (4), Cy (5); X = NPri, R = Ph (6)). The directly related cluster [Fe3(CO)7(μ3-CO)(μ3-Te)(μ-dppm)] (7) was isolated from the reaction of [Fe3(CO)10(μ-Ph2PCH2PPh2)] with elemental tellurium. The electrochemistry of these new clusters has been probed by cyclic voltammetry, and selected complexes have been tested as proton reduction catalysts. Read More

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http://dx.doi.org/10.1039/d0dt00556hDOI Listing

Experimental photoluminescence and lifetimes at wavelengths including beyond 7 microns in Sm-doped selenide-chalcogenide glass fibers.

Opt Express 2020 Apr;28(8):12373-12384

1000 ppmw Sm-doped GeSbSeGa atomic % chalcogenide bulk glass and unstructured fiber are prepared. Near- and mid-infrared absorption spectra of the bulk glass reveal Sm electronic absorption bands, and extrinsic vibrational absorption bands, due to host impurities. Fiber photoluminescence, centred at 3. Read More

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http://dx.doi.org/10.1364/OE.383033DOI Listing

CuS-NiS nanomaterials for MRI guided phototherapy of gastric carcinoma triggering mitochondria-mediated apoptosis and MLKL/CAPG-mediated necroptosis.

Nanotoxicology 2020 May 13:1-14. Epub 2020 May 13.

The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen, China.

Gastric carcinoma is one of the most lethal malignant tumors. As part of our long-term efforts on seeking effective diagnosis and therapeutic strategies of gastric cancer, we present herein novel ternary copper-based chalcogenide nanoplatform CuS-NiS nanomaterials with outstanding photothermal (PT)/photodynamic (PD) property that could effectively suppress human gastric cancer and vo without obvious side effects. We revealed that CuS-NiS induced reactive oxygen species (ROS) generation, leading to apoptosis through Bcl-2/Bax pathway of human gastric cancer cells under 808 nm near-infrared (NIR) irradiation. Read More

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http://dx.doi.org/10.1080/17435390.2020.1759727DOI Listing

Synthesis and dimensional control of CsPbBr perovskite nanocrystals using phosphorous based ligands.

J Chem Phys 2020 May;152(17):174702

Department of Chemical Sciences, Bernal Institute, University of Limerick, Limerick, Ireland.

Nanocrystals of the inorganic perovskite, CsPbBr, display outstanding photo-physical properties, making them ideal for next generation optical devices. However, the typical combination of oleic acid and oleylamine ligands employed in their synthesis is easily displaced, leading to poor stability that can hinder their applicability. In this work, we look toward the replacement of the oleic acid and amine with phosphorous-based ligands. Read More

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http://dx.doi.org/10.1063/1.5128233DOI Listing

Lithium-Doping Effects in Cu(In,Ga)Se Thin-Film and Photovoltaic Properties.

ACS Appl Mater Interfaces 2020 Jun 21;12(22):25058-25065. Epub 2020 May 21.

Department of Electronics and Electrical Engineering, Keio University, 4-1-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8521, Japan.

The beneficial effects of heavy alkali metals such as K, Rb, and Cs in enhancing Cu(In,Ga)Se (CIGS) photovoltaic efficiencies are widely known, though the detailed mechanism is still open for discussion. In the present work, the effects of the lightest alkali metal, Li, on CIGS thin-film and device properties are focused upon and compared to the effects of heavy alkali metals. Till date, the beneficial effects of elemental Li on CuZnSnS photovoltaic devices in enhancing efficiencies have been reported. Read More

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http://dx.doi.org/10.1021/acsami.0c06284DOI Listing

Investigation on the Growth Mechanism of Cu MoS Nanotube, Nanoplate and its use as a Catalyst for Hydrogen Evolution in Water.

Chem Asian J 2020 Jun 28;15(12):1873-1880. Epub 2020 May 28.

University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam.

Cu MoS is a ternary transition-metal sulfide that shows great potential in the field of energy conversion and storage, namely catalytic H evolution in water and Li-, Na- or Mg-ion battery. In this work, we report on a growth mechanism of the single-crystalline Cu MoS nanotube from (NH ) MoS salt and Cu O nanoparticle. By probing the nature and morphology of solid products generated in function of reaction conditions we find that the crystalline Cu(NH )MoS nanorod is first generated at ambient conditions. Read More

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http://dx.doi.org/10.1002/asia.202000344DOI Listing

Synthesis and optoelectronic properties of Cu3VSe4 nanocrystals.

PLoS One 2020 5;15(5):e0232184. Epub 2020 May 5.

Department of Mechanical and Materials Engineering, Florida International University, College of Engineering and Computing, Miami, Florida, United States of America.

The ternary chalcogenide Cu3VSe4 (CVSe) with sulvanite structure has been theoretically predicted to be a promising candidate for photovoltaic applications due to its suitable bandgap for solar absorption and the relatively earth-abundant elements in its composition. To realize the absorber layer via an inexpensive route, printed thin-films could be fabricated from dispersions of nano-sized Cu3VSe4 precursors. Herein, cubic Cu3VSe4 nanocrystals were successfully synthesized via a hot-injection method. Read More

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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0232184PLOS
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7199925PMC
May 2020
3.234 Impact Factor