5,254 results match your criteria films silicon

Real-time detection of copper contaminants in environmental water using porous silicon Fabry-Pérot interferometers.

Analyst 2021 Jul 21. Epub 2021 Jul 21.

Institute of Agricultural Engineering, ARO, The Volcani Center, Bet Dagan, Israel.

Water sources are vulnerable to intentional and inadvertent human pollution with thousands of synthetic and geogenic trace contaminants, posing long-term effects on the aquatic ecosystem and human health. Thus, early and rapid detection of water pollutants followed by corrective and preventive actions can lead to the reduction of the overall polluting impact to safeguard public health. This study presents a generic sensing assay for the label-free detection of copper contaminants in environmental water samples using multilayered polyethylenimine (PEI) functionalized porous silicon Fabry-Pérot interferometers. Read More

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Evidence for higher order topology in Bi and BiSb.

Nat Commun 2021 Jul 20;12(1):4420. Epub 2021 Jul 20.

Department of Physics and Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, IL, USA.

Higher order topological insulators (HOTIs) are a new class of topological materials which host protected states at the corners or hinges of a crystal. HOTIs provide an intriguing alternative platform for helical and chiral edge states and Majorana modes, but there are very few known materials in this class. Recent studies have proposed Bi as a potential HOTI, however, its topological classification is not yet well accepted. Read More

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Robust and Eco-Friendly Superhydrophobic Starch Nanohybrid Materials with Engineered Lotus Leaf Mimetic Multiscale Hierarchical Structures.

ACS Appl Mater Interfaces 2021 Jul 21. Epub 2021 Jul 21.

School of Science, College of Science, Technology, Engineering & Mathematics (STEM), RMIT University, Melbourne, Victoria 3000, Australia.

The use of superhydrophobic surfaces in a broad range of applications is receiving a great deal of attention due to their numerous functionalities. However, fabricating these surfaces using low-cost raw materials through green and fluorine-free routes has been a bottleneck in their industrial deployment. This work presents a facile and environmentally friendly strategy to prepare mechanically robust superhydrophobic surfaces with engineered lotus leaf mimetic multiscale hierarchical structures via a hybrid route combining soft imprinting and spin-coating. Read More

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Patternable Mesoporous Thin Film Quantum Materials via Block Copolymer Self-Assembly: An Emergent Technology?

ACS Appl Mater Interfaces 2021 Jul 19. Epub 2021 Jul 19.

Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States.

Recent developments in quantum materials hold promise for revolutionizing energy and information technologies. The use of soft matter self-assembly, for example, by employing block copolymers (BCPs) as structure directing or templating agents, offers facile pathways toward quantum metamaterials with highly tunable mesostructures via scalable solution processing. Here, we report the preparation of patternable mesoporous niobium carbonitride-type thin film superconductors through spin-coating of a hybrid solution containing an amphiphilic BCP swollen by niobia sol precursors and subsequent thermal processing in combination with photolithography. Read More

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Dye-Sensitized Solar Cell for Building-Integrated Photovoltaic (BIPV) Applications.

Materials (Basel) 2021 Jul 4;14(13). Epub 2021 Jul 4.

Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw, Poland.

One of the important research directions in the field of photovoltaics is integration with construction. The integration of solar cell systems with a building can reduce installation costs and help optimize the used space. Among the few literature reports on photovoltaic roof tiles, solutions with silicon and thin film solar cells dominate. Read More

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ZnO Films Incorporation Study on Macroporous Silicon Structure.

Materials (Basel) 2021 Jul 1;14(13). Epub 2021 Jul 1.

Institute for Renewable Energy, Autonomus National University of Mexico, Priv. Xochicalco S/N, Temixco, Morelos 62580, Mexico.

In the present work, we developed hybrid nanostructures based on ZnO films deposited on macroporous silicon substrates using the sol-gel spin coating and ultrasonic spray pyrolysis (USP) techniques. The changes in the growth of ZnO films on macroporous silicon were studied using a UV-visible spectrometer, an X-ray diffractometer (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). XRD analysis revealed the beneficial influence of macroporous silicon on the structural properties of ZnO films. Read More

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SiO:P,Dy nano-thin film phosphor: Synthesis, structure and luminescence properties.

Appl Radiat Isot 2021 Jul 3;176:109857. Epub 2021 Jul 3.

Ege University, Institute of Nuclear Sciences, 35100, Bornova, Izmir, Turkey.

A nano-sized thin film layer of phosphorus-dysprosium doped silicon oxide (SiO:P,Dy) was successfully synthesized using the sol-gel method combined with spin coating technique. The surface morphology, structure, and luminescence properties of the synthesized thin film were characterized using Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), Fourier Transform Infrared-Attenuated Total Reflectance (FTIR-ATR), and Photoluminescence (PL). The average surface roughness was measured as 22. Read More

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Ternary Si-SiO-Al Composite Films as High-Performance Anodes for Lithium-Ion Batteries.

ACS Appl Mater Interfaces 2021 Jul 14. Epub 2021 Jul 14.

SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, P. R. China.

Silicon (Si) is a promising anode material for lithium-ion batteries but has long been suffering from low conductivity, drastic volume change, poor cycling performance, etc. Adding SiO, Al, etc. to form Si-based binary composite films can improve some properties but have to give up others. Read More

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The role of ultrafast structural dynamics with physical and chemical changes in polydimethylsiloxane thin films by two-dimensional IR spectroscopy.

J Chem Phys 2021 May;154(17):174902

Department of Chemistry, University of Minnesota, Twin Cities, Minneapolis, Minnesota 55455, USA.

Fourier transform infrared (FTIR) and two-dimensional IR (2D-IR) spectroscopies were applied to polydimethylsiloxane (PDMS) cross-linked elastomer films. The vibrational probe for the systems studied was a silicon hydride mode that was covalently bound to the polymer chains. The structure and dynamics reported by this mode were measured in response to a wide range of chemical and physical perturbations, including elevated curing temperature, increased curing agent concentration, mechanical compression, and cooling to near the glass transition temperature. Read More

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Heterogeneous assembly of water from the vapor phase-Physical experiments and simulations with binding trifunctional organosilanes at the vapor/solid interface.

J Chem Phys 2021 Jun;154(21):214705

Chemistry Department, Louisiana State University, 232 Choppin Hall, Baton Rouge, Louisiana 70803, USA.

A trace amount of interfacial water is required to initiate hydrosilation reactions of trifunctional organosilanes to form surface assemblies. In recent studies, we have learned that water also has a critical role in directing molecular placement on surfaces because water can react with silicon to provide oxygenated sites for surface binding. Consequently, the wettability nature of substrates influences the placement and density of organosilane films formed by vapor-phase reactions. Read More

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CMOS-Compatible Protonic Programmable Resistor Based on Phosphosilicate Glass Electrolyte for Analog Deep Learning.

Nano Lett 2021 Jul 7. Epub 2021 Jul 7.

Microsystems Technology Laboratories, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.

Ion intercalation based programmable resistors have emerged as a potential next-generation technology for analog deep-learning applications. Proton, being the smallest ion, is a very promising candidate to enable devices with high modulation speed, low energy consumption, and enhanced endurance. In this work, we report on the first back-end CMOS-compatible nonvolatile protonic programmable resistor enabled by the integration of phosphosilicate glass (PSG) as the proton solid electrolyte layer. Read More

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Programmed topographical features generated on command in confined electroactive films.

Soft Matter 2021 Jul 6. Epub 2021 Jul 6.

Department of Chemical Engineering & Chemistry, Eindhoven University of Technology, De Rondom, Eindhoven 5612 AP, The Netherlands. and Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, De Rondom 70, Eindhoven 5612 AP, The Netherlands and SCNU-TUE Joint Lab of Device Integrated Responsive Materials (DIRM), South China Normal University, Guangzhou Higher Education Mega Center, P. R. China.

This work describes a method to create dynamic pre-programmed surface textures by an alternating electric field on coatings that consist of a silicon oxide reinforced viscoelastic siloxane network. The finite element method is developed to predict the complex deformation figures and time-resolved experimental topographical surface analysis is used to confirm them. Read More

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Facile rearrangement of molecular layer deposited metalcone thin films by electron beam irradiation for area selective atomic layer deposition.

Dalton Trans 2021 Jul;50(28):9958-9967

Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea. and Division of Nano-Scale Semiconductor Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.

Area selective atomic layer deposition (AS-ALD) is a promising future technology for the realization of a 5 nm scale Si complementary field effect transistor (FET) and its application in industry. AS-ALD is one of the "bottom-up" technologies, which is a key process that can reduce the cost of fabrication and decrease positional error as an alternative to the conventional "top down" technology. We researched an inhibitor for AS-ALD using molecular layer deposited (MLD) films annealed by electron beam irradiation (EBI). Read More

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Quantification of Trace-Level Silicon Doping in Al GaN Films Using Wavelength-Dispersive X-Ray Microanalysis.

Microsc Microanal 2021 Jul 5:1-9. Epub 2021 Jul 5.

Department of Physics, SUPA, University of Strathclyde, GlasgowG4 0NG, UK.

Wavelength-dispersive X-ray (WDX) spectroscopy was used to measure silicon atom concentrations in the range 35-100 ppm [corresponding to (3-9) × 1018 cm-3] in doped AlxGa1-xN films using an electron probe microanalyser also equipped with a cathodoluminescence (CL) spectrometer. Doping with Si is the usual way to produce the n-type conducting layers that are critical in GaN- and AlxGa1-xN-based devices such as LEDs and laser diodes. Previously, we have shown excellent agreement for Mg dopant concentrations in p-GaN measured by WDX with values from the more widely used technique of secondary ion mass spectrometry (SIMS). Read More

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Anisotropic silicon nanowire arrays fabricated by colloidal lithography.

Nanoscale Adv 2021 May 10;3(12):3634-3642. Epub 2021 May 10.

Institute of Particle Technology, Friedrich-Alexander University Erlangen-Nürnberg Cauerstrasse 4 91058 Erlangen Germany

The combination of metal-assisted chemical etching (MACE) and colloidal lithography allows for the affordable, large-scale and high-throughput synthesis of silicon nanowire (SiNW) arrays. However, many geometric parameters of these arrays are coupled and cannot be addressed individually using colloidal lithography. Despite recent advancements towards higher flexibility, SiNWs fabricated colloidal lithography and MACE usually have circular, isotropic cross-sections inherited from the spherical templates. Read More

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Properties of CrSi Layers Obtained by Rapid Heat Treatment of Cr Film on Silicon.

Nanomaterials (Basel) 2021 Jun 30;11(7). Epub 2021 Jun 30.

Research and Education Center "Materials", Don State Technical University, 344000 Rostov-on-Don, Russia.

The changes in the morphology and the electrophysical properties of the Cr/n-Si (111) structure depending on the rapid thermal treatment were considered in this study. The chromium films of about 30 nm thickness were deposited via magnetron sputtering. The rapid thermal treatment was performed by the irradiation of the substrate's back side with the incoherent light flux of the quartz halogen lamps in nitrogen medium up to 200-550 °C. Read More

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Metal-Assisted Catalytic Etching (MACE) for Nanofabrication of Semiconductor Powders.

Micromachines (Basel) 2021 Jun 30;12(7). Epub 2021 Jun 30.

Department of Chemistry, West Chester University, West Chester, PA 19383, USA.

Electroless etching of semiconductors has been elevated to an advanced micromachining process by the addition of a structured metal catalyst. Patterning of the catalyst by lithographic techniques facilitated the patterning of crystalline and polycrystalline wafer substrates. Galvanic deposition of metals on semiconductors has a natural tendency to produce nanoparticles rather than flat uniform films. Read More

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Spatially Ordered Matrix of Nanostructured Tin-Tungsten Oxides Nanocomposites Formed by Ionic Layer Deposition for Gas Sensing.

Sensors (Basel) 2021 Jun 17;21(12). Epub 2021 Jun 17.

R&D Laboratory of Programmable Layer-by-Layer Synthesis of Multinanolayers of Hybrid Compounds, St. Petersburg University, 199034 St. Petersburg, Russia.

The process of layer-by-layer ionic deposition of tin-tungsten oxide films on smooth silicon substrates and nanoporous anodic alumina matrices has been studied. To achieve the film deposition, solutions containing cationic SnF or SnCl and anionic NaWO or (NH)O·WO precursors have been used. The effect of the solution compositions on the films deposition rates, morphology, composition, and properties was investigated. Read More

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Silicon Oxide Etching Process of NF and FNO Plasmas with a Residual Gas Analyzer.

Materials (Basel) 2021 Jun 2;14(11). Epub 2021 Jun 2.

Department of Electrical and Biological Physics, Kwangwoon University, 20 Kwangwoon-ro, Nowon-gu, Seoul 01897, Korea.

The use of NF is significantly increasing every year. However, NF is a greenhouse gas with a very high global warming potential. Therefore, the development of a material to replace NF is required. Read More

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Capacitive Measurements of SiO Films of Different Thicknesses Using a MOSFET-Based SPM Probe.

Sensors (Basel) 2021 Jun 13;21(12). Epub 2021 Jun 13.

Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang-si 37673, Gyeongsangbuk-do, Korea.

We utilized scanning probe microscopy (SPM) based on a metal-oxide-silicon field-effect transistor (MOSFET) to image interdigitated electrodes covered with oxide films that were several hundred nanometers in thickness. The signal varied depending on the thickness of the silicon dioxide film covering the electrodes. We deposited a 400- or 500-nm-thick silicon dioxide film on each sample electrode. Read More

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One-Step Synthesis of SnI·(DMSO) Adducts for High-Performance Tin Perovskite Solar Cells.

J Am Chem Soc 2021 Jul 1. Epub 2021 Jul 1.

School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.

Contemporary thin-film photovoltaic (PV) materials contain elements that are scarce (CIGS) or regulated (CdTe and lead-based perovskites), a fact that may limit the widespread impact of these emerging PV technologies. Tin halide perovskites utilize materials less stringently regulated than the lead (Pb) employed in mainstream perovskite solar cells; however, even today's best tin-halide perovskite thin films suffer from limited carrier diffusion length and poor film morphology. We devised a synthetic route to enable in situ reaction between metallic Sn and I in dimethyl sulfoxide (DMSO), a reaction that generates a highly coordinated SnI·(DMSO) adduct that is well-dispersed in the precursor solution. Read More

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Antibacterial and Biocompatible Hydrogel Dressing Based on Gelatin- and Castor-Oil-Derived Biocidal Agent.

ACS Biomater Sci Eng 2021 Jul 1. Epub 2021 Jul 1.

Macromolecular Chemistry II, Bavarian Polymer Institute, University of Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany.

Favored antibacterial activity associated with excellent biocompatibility, mechanical durability, and exudate handling needs to be addressed by modern dressing to achieve the desired wound healing. This paper deals with developing a new green and facile approach to manufacturing nonleachable antibacterial gelatin-based films for wound dressing. Therefore, a reactive methoxy-silane-functionalized quaternary ammonium compound bearing a fatty amide residue originating from castor oil (Si-CAQ) was initially synthesized. Read More

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Columnar nitrogen-doped ZnO nanostructured thin films obtained through atomic layer deposition.

Nanotechnology 2021 Jul 14;32(40). Epub 2021 Jul 14.

Departamento de Física Aplicada, Centro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional-Unidad Mérida, Mérida, Yucatán, Mexico.

The present study was aimed to develop nitrogen-doped nanostructured ZnO thin films. These films were produced in a sequential procedure involving the atomic layer deposition technique, and a hydrothermal process supported by microwave heating. Employing the atomic layer deposition technique, through self-limited reactions of diethylzinc (DEZn) and HO, carried out at 3. Read More

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Antiviral adsorption activity of porous silicon nanoparticles against different pathogenic human viruses.

Bioact Mater 2021 Jun 16. Epub 2021 Jun 16.

Institute for Biological Instrumentation of Russian Academy of Sciences, 142290, Pushchino, Moscow Region, Russian Federation.

New viral infections, due to their rapid spread, lack of effective antiviral drugs and vaccines, kill millions of people every year. The global pandemic SARS-CoV-2 in 2019-2021 has shown that new strains of viruses can widespread very quickly, causing disease and death, with significant socio-economic consequences. Therefore, the search for new methods of combating different pathogenic viruses is an urgent task, and strategies based on nanoparticles are of significant interest. Read More

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UV- and Thermally-Active Bifunctional Gelators Create Surface-Anchored Polymer Networks.

Macromol Rapid Commun 2021 Jun 26:e2100266. Epub 2021 Jun 26.

Global Station for Soft Matter, Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University, Hokkaido, 060-0808, Japan.

A versatile one-step synthesis of surface-attached polymer networks using small bifunctional gelators (SBG), namely 4-azidosulfonylphenethyltrimethoxysilane (4-ASPTMS) and 6-azidosulfonylhexyltriethoxysilane (6-ASHTES) is reported. A thin layer (≈200 nm) of a mixture comprising ≈90% precursor polymer and 10% of 4-ASPTMS or 10% 6-ASHTES on a silicon wafer is deposited. Upon UV irradiation (≈l-254 nm) or annealing (>100 °C) layers, sulfonyl azides (SAz) release nitrogen by forming singlet and triplet nitrenes that concurrently react with any C─H bond in the vicinity resulting in sulfonamide crosslinks. Read More

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Improvement of the Optoelectrical Properties of a Transparent Conductive Polymer via the Introduction of ITO Nanoparticles and Its Application in Crystalline Silicon/Organic Heterojunction Solar Cells.

ACS Appl Mater Interfaces 2021 Jul 25;13(26):31171-31179. Epub 2021 Jun 25.

Key Laboratory for Special Functional Materials and Structure Design of Ministry of Education, School of Materials and Energy, Lanzhou University, Lanzhou 730000, China.

Compared with conventional transparent conductive indium tin oxide (ITO) films, poly(3,4-ethylenedioxythiophene):poly (styrenesulfonic acid) (PEDOT:PSS) as a conductive polymer material has been diffusely applied in organic optoelectronic devices. However, its optoelectrical properties need to be further improved. Therefore, a simple and universal approach with introducing ITO nanoparticles (NPs) was proposed to improve the optoelectrical properties of PEDOT:PSS thin films. Read More

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Thermal stability and diffusion characteristics of ultrathin amorphous carbon films grown on crystalline and nitrogenated silicon substrates by filtered cathodic vacuum arc deposition.

Sci Rep 2021 Jun 23;11(1):13106. Epub 2021 Jun 23.

Department of Mechanical Engineering, University of California, Berkeley, CA, 94720, USA.

Amorphous carbon (a-C) films are widely used as protective overcoats in many technology sectors, principally due to their excellent thermophysical properties and chemical inertness. The growth and thermal stability of sub-5-nm-thick a-C films synthesized by filtered cathodic vacuum arc on pure (crystalline) and nitrogenated (amorphous) silicon substrate surfaces were investigated in this study. Samples of a-C/Si and a-C/SiN/Si stacks were thermally annealed for various durations and subsequently characterized by high-resolution transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS). Read More

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Solution processable passivated silicon nanowires.

Nanoscale 2021 Jul;13(26):11439-11445

Hebei Key Lab of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China. and Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe 76021, Germany.

The 1D confinement of silicon in the form of a nanowire revives its newness with the emergence of new optical and electronic properties. However, the development of a production process for silicon nanowires (SiNWs) having a high quality crystalline core and exhibiting good stability in solution with effective outer-shell defect passivation is still a challenge. In this work, SiNWs are prepared from a silicon wafer using solution processing steps, and importantly outer-shell-defect passivation is achieved by in situ grafting of organic molecules based on thin films. Read More

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Reduced graphene oxide on silicon-based structure as novel broadband photodetector.

Sci Rep 2021 Jun 21;11(1):13015. Epub 2021 Jun 21.

Istituto Scienze Applicate e Sistemi Intelligenti "E. Caianiello" ISASI-CNR, Comprensorio "A. Olivetti" Ed. 70, 80072, Pozzuoli, Naples, Italy.

Heterojunction photodetector based on reduced graphene oxide (rGO) has been realized using a spin coating technique. The electrical and optical characterization of bare GO and thermally reduced GO thin films deposited on glass substrate has been carried out. Ultraviolet-visible-infrared transmittance measurements of the GO and rGO thin films revealed broad absorption range, while the absorbance analysis evaluates rGO band gap of about 2. Read More

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Chiral high-harmonic generation and spectroscopy on solid surfaces using polarization-tailored strong fields.

Nat Commun 2021 Jun 17;12(1):3723. Epub 2021 Jun 17.

4th Physical Institute-Solids and Nanostructures, University of Göttingen, Göttingen, Germany.

Strong-field methods in solids enable new strategies for ultrafast nonlinear spectroscopy and provide all-optical insights into the electronic properties of condensed matter in reciprocal and real space. Additionally, solid-state media offers unprecedented possibilities to control high-harmonic generation using modified targets or tailored excitation fields. Here we merge these important points and demonstrate circularly-polarized high-harmonic generation with polarization-matched excitation fields for spectroscopy of chiral electronic properties at surfaces. Read More

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