5,345 results match your criteria thermal annealing

Effect of Transition Metal Doping on the Structural, Morphological, and Magnetic Properties of NiFeO.

Materials (Basel) 2022 Apr 20;15(9). Epub 2022 Apr 20.

INCDO-INOE 2000, Research Institute for Analytical Instrumentation, 67 Donath Street, 400293 Cluj-Napoca, Romania.

Sol-gel route followed by thermal treatment was used to produce NiFeO doped with transition metal ions (Zn, Mn, Co). The structural, morphological, and magnetic properties of the doped NiFeO were compared with those of virgin NiFeO. The metal-glyoxylates' formation and decomposition as well as the thermal stability of the doped and virgin ferrites were assessed by thermal analysis. Read More

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Fabrication and Optical Characterization of VO-Based Thin Films Deposited on Practical Float Glass by Magnetron Sputtering and Professional Annealing.

Materials (Basel) 2022 Apr 20;15(9). Epub 2022 Apr 20.

State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.

In this paper, VO thin films with good optical properties are fabricated on practical float glass by magnetron sputtering and a professional annealing method. The near-infrared switching efficiency (NIRSE) of the prepared film reaches 39% (@2000 nm), and its near-infrared energy modulation ability (ΔT) reaches 10.9% (780-2500 nm). Read More

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Laser-Induced Erasable and Re-Writable Waveguides within Silver Phosphate Glasses.

Materials (Basel) 2022 Apr 20;15(9). Epub 2022 Apr 20.

Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), 71110 Heraklion, Greece.

Femtosecond direct laser writing is a well-established and robust technique for the fabrication of photonic structures. Herein, we report on the fabrication of buried waveguides in AgPO silver metaphosphate glasses, as well as, on the erase and re-writing of those structures, by means of a single femtosecond laser source. Based on the fabrication procedure, the developed waveguides can be erased and readily re-inscribed upon further femtosecond irradiation under controlled conditions. Read More

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Integrating charge mobility, stability and stretchability within conjugated polymer films for stretchable multifunctional sensors.

Nat Commun 2022 May 18;13(1):2739. Epub 2022 May 18.

Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.

Conjugated polymers (CPs) are promising semiconductors for intrinsically stretchable electronic devices. Ideally, such CPs should exhibit high charge mobility, excellent stability, and high stretchability. However, converging all these desirable properties in CPs has not been achieved via molecular design and/or device engineering. Read More

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Reversible Multilevel Stimuli-Responsiveness and Multicolor Room Temperature Phosphorescence Emission Based on a Single-Component System.

Angew Chem Int Ed Engl 2022 May 16. Epub 2022 May 16.

East China University of Science and Technology, Key Laboratory for Advanced Materials and Institute of Fine Chemicals, Mailbox 257, Meilong Rd 130, 200237, Shanghai, CHINA.

There are limited reports about the transformation of pure organic room temperature phosphorescence (RTP) materials with multilevel stimuli-responsiveness at different RTP emission wavelengths under external stimuli. It is difficult to ensure efficient intersystem crossing (ISC) in different states based on single-component system. This research reported the conversion of organic single-component small molecule 1,2-bis (4-alkoxyphenyl) ethane-1,2-dione (N-BOX) with multilevel stimuli-responsiveness between high-efficiency blue and yellow RTP by grinding or thermal annealing N-BOX crystal. Read More

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Effect of Oligomer Segregation on the Aggregation State and Strength at the Polystyrene/Substrate Interface.

ACS Macro Lett 2022 04 23;11(4):504-509. Epub 2022 Mar 23.

Department of Applied Chemistry, Center for Polymer Interface and Molecular Adhesion Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.

The interfacial strength of polystyrene (PS) with and without PS oligomers in contact with a glass substrate was examined to determine the relationship between the interfacial aggregation state and adhesion. The shear bond strength and adsorbed layer thickness of neat PS exhibited a similar dependence on the thermal annealing time: they increased to constant values within almost the same time. This implies that the adhesion of the polymer is closely related to the formation of an adsorbed layer at the adhesion interface. Read More

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Deformation-activated recrystallization twin: New twinning path in pure aluminum enabled by cryogenic and rapid compression.

iScience 2022 May 14;25(5):104248. Epub 2022 Apr 14.

Department of Materials Science and Engineering, National Taiwan University, Roosevelt Road, Taipei 10617, Taiwan.

Bulk aluminum rarely forms deformation or annealing twins owing to its high stacking fault energy. We report a novel twinning mechanism mediated by dynamic recrystallization in 6N pure aluminum under high strain rate (∼1.3 × 10 s) impact at a cryogenic temperature (77 K). Read More

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Fabrication of Alkaline Electrolyzer Using [email protected] as an Effective Electrocatalyst and Composite Anion Exchange Membrane.

ACS Omega 2022 May 27;7(18):15467-15477. Epub 2022 Apr 27.

Electro Membrane Processes Laboratory, Membrane Science and Separation Technology Division, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, India.

Here, we report the synthesis of nickel nanoparticles thermally encapsulated in multiwalled carbon nanotubes (MWCNTs) and its utility in alkaline water splitting by combining with composite thermoset anion-exchange membrane. [email protected] displayed both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). It provided 10 mA cm current density at an overpotential of 300 mV for OER and 254 mV for HER on a glassy carbon electrode, respectively. Read More

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Shear-Modulated Rates of Phase Transitions in Sphere-Forming Diblock Oligomer Lyotropic Liquid Crystals.

ACS Macro Lett 2021 May 19;10(5):538-544. Epub 2021 Apr 19.

Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States.

Hydration of the amphiphilic diblock oligomer CH(CHCHO)OH (CE) leads to concentration-dependent formation of micellar body-centered cubic (BCC) and Frank-Kasper A15 lyotropic liquid crystals (LLCs). Quiescent thermal annealing of aqueous LLCs comprising 56-59 wt % CE at 25 °C after quenching from high temperatures established their ability to form short-lived BCC phases, which transform into long-lived, transient Frank-Kasper σ phases en route to equilibrium A15 morphologies on a time scale of months. Here, the frequency and magnitude of applied oscillatory shear show the potential to either dynamically stabilize the metastable BCC phase at low frequencies or increase the rate of formation of the A15 to minutes at high frequencies. Read More

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Sustainable-Macromolecule-Assisted Preparation of Cross-linked, Ultralight, Flexible Graphene Aerogel Sensors toward Low-Frequency Strain/Pressure to High-Frequency Vibration Sensing.

Small 2022 May 16:e2202047. Epub 2022 May 16.

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

Ultralight and highly flexible aerogel sensors, composed of reduced graphene oxide cross-linked by sustainable-macromolecule-derived carbon, are prepared via facile freeze-drying and thermal annealing. The synergistic combination of cross-linked graphene nanosheets and micrometer-sized honeycomb pores gives rise to the exceptional properties of the aerogels, including superior compressibility and resilience, good mechanical strength and durability, satisfactory fire-resistance, and outstanding electromechanical sensing performances. The corresponding aerogel sensors, operated at an ultralow voltage of 0. Read More

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Classical Simulation and Theory of Quantum Annealing in a Thermal Environment.

Phys Rev Lett 2022 Apr;128(17):170502

Department of Physics, Tohoku University, Sendai 980-8578, Japan.

We study quantum annealing in the quantum Ising model coupled to a thermal environment. When the speed of quantum annealing is sufficiently slow, the system evolves following the instantaneous thermal equilibrium. This quasistatic and isothermal evolution, however, fails near the end of annealing because the relaxation time grows infinitely, therefore yielding excess energy from the thermal equilibrium. Read More

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Electronic Self-Passivation of Single Vacancy in Black Phosphorus via Ionization.

Phys Rev Lett 2022 Apr;128(17):176801

Department of Chemistry, National University of Singapore, Singapore 117543, Singapore.

We report that monoelemental black phosphorus presents a new electronic self-passivation scheme of single vacancy (SV). By means of low-temperature scanning tunneling microscopy and noncontact atomic force microscopy, we demonstrate that the local reconstruction and ionization of SV into negatively charged SV^{-} leads to the passivation of dangling bonds and, thus, the quenching of in-gap states, which can be achieved by mild thermal annealing or STM tip manipulation. SV exhibits a strong and symmetric Friedel oscillation (FO) pattern, while SV^{-} shows an asymmetric FO pattern with local perturbation amplitude reduced by one order of magnitude and a faster decay rate. Read More

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Bio-Based Polymeric Substrates for Printed Hybrid Electronics.

Polymers (Basel) 2022 May 2;14(9). Epub 2022 May 2.

Sustainable Products and Materials, VTT Technical Research Centre of Finland, Visiokatu 4, 33720 Tampere, Finland.

Printed flexible hybrid electronics (FHE) is finding an increasing number of applications in the fields of displays, sensors, actuators and in energy harvesting and storage. The technology involves the printing of conductive and insulating patterns as well as mounting electronic devices and circuits on flexible substrate materials. Typical plastic substrates in use are, for example, non-renewable-based poly(ethylene terephthalate) (PET) or poly(imides) (PI) with high thermal and dimensional stability, solvent resistance and mechanical strength. Read More

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The Influence of Thermal Treatments on Anchor Effect in NMT Products.

Polymers (Basel) 2022 Apr 20;14(9). Epub 2022 Apr 20.

Department of Polymer Science and Engineering, State Key Laboratory of Coordination Chemistry, Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education, Nanjing University, Nanjing 210023, China.

The anchor effect in nanomolding technology (NMT) refers to the effect that polymer nanorods in nanopores on metal surfaces act as anchors to firmly bond the outside polymer components onto the metal surface. In this work, the influences of thermal treatments on the anchor effect are studied at microscopic level from the perspective of interfacial interaction by a model system (poly(-butyl methacrylate) (PBMA) and alumina nanopore composite). The differential scanning calorimeter and fluorescence results indicate that the formation of a dense polymer layer in close contact with the pore walls after proper thermal treatments is the key for a strong interfacial interaction. Read More

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Direct Synthesis of MoS Nanosheets in Reduced Graphene Oxide Nanoscroll for Enhanced Photodetection.

Nanomaterials (Basel) 2022 May 6;12(9). Epub 2022 May 6.

Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, China.

Due to their unique tubular and spiral structure, graphene and graphene oxide nanoscrolls (GONS) have shown extensive applications in various fields. However, it is still a challenge to improve the optoelectronic application of graphene and GONS because of the zero bandgap of graphene. Herein, ammonium tetrathiomolybdate ((NH)MoS) was firstly wrapped into the ((NH)[email protected]) by molecular combing the mixture of (NH)MoS and GO solution on hydrophobic substrate. Read More

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Synthesis and Characterization of CuZnSnSe by Non-Vacuum Method for Photovoltaic Applications.

Nanomaterials (Basel) 2022 Apr 28;12(9). Epub 2022 Apr 28.

Department of Energy Science and Engineering, Indian Institute of Technology Bombay Powai, Mumbai 400076, India.

Wet ball milling was used for the synthesis of CuZnSnSe (CZTSe) nanoparticles with a kesterite structure. The prepared nanoparticles were used for ink formulation. Surfactants and binders were added to improve the ink stability, prevent agglomeration, and enhance ink adhesion. Read More

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Exciton dynamics and photoresponse behavior of the in-situ annealed CsSnBr3 perovskite films synthesized by thermal evaporation.

Nanotechnology 2022 May 12. Epub 2022 May 12.

School of Physics, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, CHINA.

The CsSnBr3 photodetectors are fabricated by thermal evaporation and 75°C in-situ annealing, and the effect of in-situ annealing on the morphology, structure, exciton dynamics and photoresponse of thermally evaporated CsSnBr3 films are investigated. Especially, temperature-dependent steady-state photoluminescence (PL) and transient PL decaying have been analyzed in details for understanding the exciton dynamics. Meanwhile, effect of annealing on the activation energy for trap sites (Ea), exciton binding energy (Eb), activation energy for interfacial trapped carriers (ΔE), trap densities and carriers mobilities are studied and the annealed (A-CsSnBr3) reveals obviously lower Eb and trap density together with notably higher carrier mobility than those of the unannealed (UA-CsSnBr3). Read More

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Thermal Stability and Nucleation Efficacy of Shear-Induced Pointlike and Shishlike Crystallization Precursors.

ACS Macro Lett 2021 Jun 13;10(6):684-689. Epub 2021 May 13.

Interdisciplinary Center for Transfer-Oriented Research in Natural Sciences (IWE TFN), Martin Luther University Halle-Wittenberg, 06099 Halle/Saale, Germany.

The different thermal stabilities of shear-induced pointlike and shishlike crystallization precursors of polyamide 11, generated in a parallel-plate rheometer and coexisting in the same sample, were quantified by hot-stage microscopy, by performing self-seed crystallization experiments. Crystals formed at low supercooling of the melt from these different types of precursors melt at about the same temperature. Annealing of the melt at different temperatures for a predefined time revealed dissolution/disordering of these precursors at 10-15 K higher temperature, near the equilibrium melting point. Read More

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Influence of Alkyl Chain Spacer Length on the Charge Carrier Mobility of Isotactic Poly(-carbazolylalkyl acrylates).

ACS Macro Lett 2021 06 24;10(6):720-726. Epub 2021 May 24.

Department of Chemistry, Loker Hydrocarbon Research Institute, University of Southern California, Los Angeles, California 90089-1661, United States.

In the search for semiconducting polymer alternatives to conjugated polymers, stereoregular nonconjugated pendant electroactive polymers (NCPEPs) have recently shown competitive hole mobilities with conjugated polymers and a dramatic increase in mobility relative to atactic analogues. Here we investigate one of the key structural variables of NCPEPs: the flexible alkyl spacer that separates the electroactive pendant from the backbone. We investigate a straightforward postpolymerization functionalization synthetic method to synthesize such polymers with high isotacticity using poly(carbazolylalkyl acrylate) as a model system, where the alkyl chain spacer in the NCPEPs is varied from 2 to 12 carbons. Read More

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Temperature-Driven α-β Phase Transformation and Enhanced Electronic Property of 2H α-InSe.

ACS Appl Mater Interfaces 2022 May 12. Epub 2022 May 12.

Key Laboratory for the Physics and Chemistry of Nanodevices, School of Electronics, Peking University, Beijing 100871, China.

In recent years, thin layered indium selenide (InSe) has attracted rapidly increasing attention due to its fascinating properties and promising applications. Here, we report the temperature-driven α-β phase transformation and the enhanced electronic property of 2H -InSe. We find that 2H α-InSe transforms to β-InSe when it is heated to a high temperature, and the transformation temperature increases from 550 to 650 K with the thickness decreasing from 67 to 17 nm. Read More

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Unique and Excellent Paintable Liquid Metal for Fluorescent Displays.

ACS Appl Mater Interfaces 2022 May 10. Epub 2022 May 10.

Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China.

A liquid metal (LM) generally has excellent electrical conductivity, thermal conductivity, flexibility, fluidity, and reflectivity. Innovative electronics using a LM to paint colorful fluorescent patterns may be applied to many important fields. Herein we propose, for the first time, the use of a LM to paint fluorescent patterns in the field of natural science. Read More

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In situ phase formation during high-temperature synthesis in clad mechanocomposites based on the Ti-Al system.

J Synchrotron Radiat 2022 May 15;29(Pt 3):698-710. Epub 2022 Mar 15.

Polzunov Altai State Technical University, Lenina Avenue, Barnaul, Altai Region 656038, Russian Federation.

An in situ synchrotron experimental study of phase formation dynamics in clad mechanocomposites of Ti-Al systems during high-temperature synthesis was performed. Cladding of the obtained mechanocomposites was carried out with an SiO target, with a deposition time of 40 min. The high-temperature synthesis was performed using the thermal explosion method based on a microwave induction heater in the in situ mode on an experimental setup adapted to synchrotron radiation time-resolved diffractometry. Read More

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Microstructuring to Improve the Thermal Stability of GeSn Layers.

ACS Appl Mater Interfaces 2022 May 5;14(19):22270-22277. Epub 2022 May 5.

ESRF - The European Synchrotron, 71 Avenue des Martyrs, 38000 Grenoble, France.

Tin segregation in GeSn alloys is one of the major problems potentially hindering the use of this material in devices. GeSn microdisks fabricated from layers with Sn concentrations up to 16.9% underwent here annealing at temperatures as high as 400 °C for 20 min without Sn segregation, in contrast with the full segregation observed in the corresponding blanket layers annealed simultaneously. Read More

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Synthesis and characterization of α-Fe2O3 nanoparticles showing potential applications for sensing quaternary ammonium vapor at room temperature.

Nanotechnology 2022 May 4. Epub 2022 May 4.

Universidade de Brasília Instituto de Física, 70910-900 Brasilia, DF, Brasilia, Brasília, 70910-900, BRAZIL.

P-type and n-type metal oxide semiconductors are widely used in the manufacture of gas sensing materials, due to their excellent electronic, electrical and electrocatalytic properties. Hematite (α-Fe2O3) compound has been reported as a promising material for sensing broad types of gases, due to its affordability, good stability and semiconducting properties. In the present work, the efficient and easy-to-implement sol-gel method has been used to synthesize α-Fe2O3 nanoparticles (NPs). Read More

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A comparative study of oxide-derived Cu electrocatalysts through electrochemical thermal reduction.

Chem Commun (Camb) 2022 May 20;58(41):6120-6123. Epub 2022 May 20.

Institute of Molecular Plus, Tianjin University, 92 Weijin Road, Tianjin 300072, China.

Herein, we demonstrated how the processing routes of OD-Cu affected the surface structure and electrochemical reduction of CO. We found that the OD-Cu obtained by H annealing is large Cu nanoparticles (>100 nm) while the OD-Cu processed by electrochemical reduction possesses a porous structure of aggregated small Cu + CuO nanoparticles (∼5 nm). These structural differences lead to a distinct performance. Read More

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The effects of thermal treatment and irradiation on the chemical properties of natural diamonds.

Phys Chem Chem Phys 2022 May 18;24(19):11696-11703. Epub 2022 May 18.

Department of Chemical Sciences, Faculty of Natural Sciences, Ariel University, Ariel, Israel.

The modification of nitrogen-contaminated diamonds into color-enhanced diamonds is usually achieved by irradiation and thermal treatment (annealing). These treatments affect nitrogen contamination chemical bonding, vacancy concentration, and atom orientation centers in the diamond lattice. In this study, natural diamonds were subjected to irradiation and thermal annealing color enhancement treatments to produce green, blue, and yellow fancy diamonds. Read More

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LSPR based on-chip detection of dengue NS1 antigen in whole blood.

RSC Adv 2021 Oct 15;11(53):33770-33780. Epub 2021 Oct 15.

Fluid Systems Lab, Department of Mechanical Engineering, Indian Institute of Technology Madras Chennai India

The development of a biosensor for rapid and quantitative detection of the dengue virus continues to remain a challenge. We report a lab-on-chip device that combines membrane-based blood plasma separation and a localized surface plasmon resonance (LSPR) based biosensor for on-chip detection of dengue NS1 antigen from a few drops of blood. The LSPR effect is realized by irradiating UV-NIR light having a spectral peak at 655 nm onto nanostructures fabricated thermal annealing of a thin metal film. Read More

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October 2021

Large-scale preparation of graphene oxide film and its application for electromagnetic interference shielding.

RSC Adv 2021 Oct 11;11(53):33302-33308. Epub 2021 Oct 11.

School of Chemistry and Chemical Engineering, Shandong University Jinan Shandong 250100 P. R. China.

In this work, a large-scale preparation of graphene oxide (GO) film is reported, and the structure and the compositional variation was studied after thermal annealing. The electromagnetic interference (EMI) shielding performance of thermally reduced GO films was also investigated. Commercial GO clay was well dispersed by high-speed shearing and formed a stable slurry with a high solid content in water (5%), and this was chosen rather than organic solvent due to its optimal performance in coating procedures and film quality. Read More

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October 2021

Microstructure and electrochemical properties of high performance graphene/manganese oxide hybrid electrodes.

RSC Adv 2021 Sep 24;11(50):31608-31620. Epub 2021 Sep 24.

Department of Chemical Engineering, Auburn University Auburn AL USA

Hybrids consisting of 2D ultra-large reduced graphene oxide (RGO) sheets (∼30 μm long) and 1D α-phase manganese oxide (MnO) nanowires were fabricated through a versatile synthesis technique that results in electrostatic binding of the nanowires and sheets. Two different hybrid (RGO/MnO) compositions had remarkable features and performance: 3 : 1 MnO/RGO (75/25 wt%) denoted as 3H and 10 : 1 MnO/RGO (90/10 wt%) denoted as 10H. Characterization using spectroscopy, microscopy, and thermal analysis provided insights into the microstructure and behavior of the individual components and hybrids. Read More

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September 2021

X-ray excited luminescence spectroscopy and imaging with NaGdF:Eu and Tb.

RSC Adv 2021 Sep 24;11(50):31717-31726. Epub 2021 Sep 24.

Department of Chemistry, Center for Optical Materials Engineering and Technology (COMSET), Clemson University Clemson SC USA

X-ray excited optical luminescence from nanophosphors can be used to selectively generate light in tissue for imaging and stimulating light-responsive materials and cells. Herein, we synthesized X-ray scintillating NaGdF:Eu and Tb nanophosphors co-precipitate and hydrothermal methods, encapsulated with silica, functionalized with biotin, and characterized by X-ray excited optical luminescence spectroscopy and imaging. The nanophosphors synthesized by co-precipitate method were ∼90 and ∼106 nm in diameter, respectively, with hydrothermally synthesized particles showing the highest luminescence intensity. Read More

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September 2021