The Experts below are selected from a list of 16020 Experts worldwide ranked by ideXlab platform
Peidong Yang - One of the best experts on this subject based on the ideXlab platform.
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cysteine cystine photoregeneration for oxygenic photosynthesis of acetic acid from co2 by a tandem inorganic biological hybrid system
Nano Letters, 2016Co-Authors: Kelsey K Sakimoto, Stephanie J Zhang, Peidong YangAbstract:Tandem “Z-scheme” approaches to solar-to-chemical production afford the ability to independently develop and optimize reductive photocatalysts for CO2 reduction to multicarbon compounds and oxidative photocatalysts for O2 evolution. To connect the two redox processes, molecular redox shuttles, reminiscent of biological electron transfer, offer an additional level of facile chemical tunability that eliminates the need for solid-state Semiconductor Junction engineering. In this work, we report a tandem inorganic–biological hybrid system capable of oxygenic photosynthesis of acetic acid from CO2. The photoreductive catalyst consists of the bacterium Moorella thermoacetica self-photosensitized with CdS nanoparticles at the expense of the thiol amino acid cysteine (Cys) oxidation to the disulfide form cystine (CySS). To regenerate the CySS/Cys redox shuttle, the photooxidative catalyst, TiO2 loaded with cocatalyst Mn(II) phthalocyanine (MnPc), couples water oxidation to CySS reduction. The combined system M. t...
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cysteine cystine photoregeneration for oxygenic photosynthesis of acetic acid from co2 by a tandem inorganic biological hybrid system
Nano Letters, 2016Co-Authors: Kelsey K Sakimoto, Stephanie J Zhang, Peidong YangAbstract:Tandem "Z-scheme" approaches to solar-to-chemical production afford the ability to independently develop and optimize reductive photocatalysts for CO2 reduction to multicarbon compounds and oxidative photocatalysts for O2 evolution. To connect the two redox processes, molecular redox shuttles, reminiscent of biological electron transfer, offer an additional level of facile chemical tunability that eliminates the need for solid-state Semiconductor Junction engineering. In this work, we report a tandem inorganic-biological hybrid system capable of oxygenic photosynthesis of acetic acid from CO2. The photoreductive catalyst consists of the bacterium Moorella thermoacetica self-photosensitized with CdS nanoparticles at the expense of the thiol amino acid cysteine (Cys) oxidation to the disulfide form cystine (CySS). To regenerate the CySS/Cys redox shuttle, the photooxidative catalyst, TiO2 loaded with cocatalyst Mn(II) phthalocyanine (MnPc), couples water oxidation to CySS reduction. The combined system M. thermoacetica-CdS + TiO2-MnPc demonstrates a potential biomimetic approach to complete oxygenic solar-to-chemical production.
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Cysteine–Cystine Photoregeneration for Oxygenic Photosynthesis of Acetic Acid from CO2 by a Tandem Inorganic–Biological Hybrid System
2016Co-Authors: Kelsey K Sakimoto, Stephanie J Zhang, Peidong YangAbstract:Tandem “Z-scheme” approaches to solar-to-chemical production afford the ability to independently develop and optimize reductive photocatalysts for CO2 reduction to multicarbon compounds and oxidative photocatalysts for O2 evolution. To connect the two redox processes, molecular redox shuttles, reminiscent of biological electron transfer, offer an additional level of facile chemical tunability that eliminates the need for solid-state Semiconductor Junction engineering. In this work, we report a tandem inorganic–biological hybrid system capable of oxygenic photosynthesis of acetic acid from CO2. The photoreductive catalyst consists of the bacterium Moorella thermoacetica self-photosensitized with CdS nanoparticles at the expense of the thiol amino acid cysteine (Cys) oxidation to the disulfide form cystine (CySS). To regenerate the CySS/Cys redox shuttle, the photooxidative catalyst, TiO2 loaded with cocatalyst Mn(II) phthalocyanine (MnPc), couples water oxidation to CySS reduction. The combined system M. thermoacetica–CdS + TiO2–MnPc demonstrates a potential biomimetic approach to complete oxygenic solar-to-chemical production
Y Rosenwaks - One of the best experts on this subject based on the ideXlab platform.
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barrier height measurement of metal contacts to si nanowires using internal photoemission of hot carriers
Nano Letters, 2013Co-Authors: Kunho Yoon, Iddo Amit, Y Rosenwaks, Jerome K Hyun, Justin G Connell, Lincoln J LauhonAbstract:Barrier heights between metal contacts and silicon nanowires were measured using spectrally resolved scanning photocurrent microscopy (SPCM). Illumination of the metal-Semiconductor Junction with sub-bandgap photons generates a photocurrent dominated by internal photoemission of hot electrons. Analysis of the dependence of photocurrent yield on photon energy enables quantitative extraction of the barrier height. Enhanced doping near the nanowire surface, mapped quantitatively with atom probe tomography, results in a lowering of the effective barrier height. Occupied interface states produce an additional lowering that depends strongly on diameter. The doping and diameter dependencies are explained quantitatively with finite element modeling. The combined tomography, electrical characterization, and numerical modeling approach represents a significant advance in the quantitative analysis of transport mechanisms at nanoscale interfaces that can be extended to other nanoscale devices and heterostructures.
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measuring minority carrier diffusion length using a kelvin probe force microscope
Physical Review B, 2000Co-Authors: Rafi Shikler, T Meoded, N Fried, Y RosenwaksAbstract:A method based on Kelvin probe force microscopy for measuring minority-carrier diffusion length in Semiconductors is described. The method is based on measuring the surface photovoltage between the tip of an atomic force microscope and the surface of an illuminated Semiconductor Junction. The photogenerated carriers diffuse to the Junction and change the contact potential difference between the tip and the sample, as a function of the distance from the Junction. The diffusion length L is then obtained by fitting the measured contact potential difference using the minority-carrier continuity equation. The method was applied to measurements of electron diffusion length in GaP $\mathrm{pn}$ and Schottky Junctions. The measured diffusion length was found to be $\ensuremath{\sim}2 \ensuremath{\mu}\mathrm{m},$ in good agreement with electron beam induced current measurements.
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direct measurement of minority carriers diffusion length using kelvin probe force microscopy
Applied Physics Letters, 1999Co-Authors: T Meoded, Rafi Shikler, N Fried, Y RosenwaksAbstract:We report on the use of Kelvin force microscopy as a method for measuring very short minority carrier diffusion length in Semiconductors. The method is based on measuring the surface photovoltage between the tip of an atomic force microscope and the surface of an illuminated Semiconductor Junction. The photogenerated carriers diffuse to the Junction, and change the contact potential difference between the tip and the sample as a function of the distance from the Junction edge. The diffusion length L is then obtained by fitting the measured contact potential difference using the minority carrier continuity equation. The method is applied to measurements of electron diffusion lengths in GaP epilayers.
Kelsey K Sakimoto - One of the best experts on this subject based on the ideXlab platform.
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cysteine cystine photoregeneration for oxygenic photosynthesis of acetic acid from co2 by a tandem inorganic biological hybrid system
Nano Letters, 2016Co-Authors: Kelsey K Sakimoto, Stephanie J Zhang, Peidong YangAbstract:Tandem “Z-scheme” approaches to solar-to-chemical production afford the ability to independently develop and optimize reductive photocatalysts for CO2 reduction to multicarbon compounds and oxidative photocatalysts for O2 evolution. To connect the two redox processes, molecular redox shuttles, reminiscent of biological electron transfer, offer an additional level of facile chemical tunability that eliminates the need for solid-state Semiconductor Junction engineering. In this work, we report a tandem inorganic–biological hybrid system capable of oxygenic photosynthesis of acetic acid from CO2. The photoreductive catalyst consists of the bacterium Moorella thermoacetica self-photosensitized with CdS nanoparticles at the expense of the thiol amino acid cysteine (Cys) oxidation to the disulfide form cystine (CySS). To regenerate the CySS/Cys redox shuttle, the photooxidative catalyst, TiO2 loaded with cocatalyst Mn(II) phthalocyanine (MnPc), couples water oxidation to CySS reduction. The combined system M. t...
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cysteine cystine photoregeneration for oxygenic photosynthesis of acetic acid from co2 by a tandem inorganic biological hybrid system
Nano Letters, 2016Co-Authors: Kelsey K Sakimoto, Stephanie J Zhang, Peidong YangAbstract:Tandem "Z-scheme" approaches to solar-to-chemical production afford the ability to independently develop and optimize reductive photocatalysts for CO2 reduction to multicarbon compounds and oxidative photocatalysts for O2 evolution. To connect the two redox processes, molecular redox shuttles, reminiscent of biological electron transfer, offer an additional level of facile chemical tunability that eliminates the need for solid-state Semiconductor Junction engineering. In this work, we report a tandem inorganic-biological hybrid system capable of oxygenic photosynthesis of acetic acid from CO2. The photoreductive catalyst consists of the bacterium Moorella thermoacetica self-photosensitized with CdS nanoparticles at the expense of the thiol amino acid cysteine (Cys) oxidation to the disulfide form cystine (CySS). To regenerate the CySS/Cys redox shuttle, the photooxidative catalyst, TiO2 loaded with cocatalyst Mn(II) phthalocyanine (MnPc), couples water oxidation to CySS reduction. The combined system M. thermoacetica-CdS + TiO2-MnPc demonstrates a potential biomimetic approach to complete oxygenic solar-to-chemical production.
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Cysteine–Cystine Photoregeneration for Oxygenic Photosynthesis of Acetic Acid from CO2 by a Tandem Inorganic–Biological Hybrid System
2016Co-Authors: Kelsey K Sakimoto, Stephanie J Zhang, Peidong YangAbstract:Tandem “Z-scheme” approaches to solar-to-chemical production afford the ability to independently develop and optimize reductive photocatalysts for CO2 reduction to multicarbon compounds and oxidative photocatalysts for O2 evolution. To connect the two redox processes, molecular redox shuttles, reminiscent of biological electron transfer, offer an additional level of facile chemical tunability that eliminates the need for solid-state Semiconductor Junction engineering. In this work, we report a tandem inorganic–biological hybrid system capable of oxygenic photosynthesis of acetic acid from CO2. The photoreductive catalyst consists of the bacterium Moorella thermoacetica self-photosensitized with CdS nanoparticles at the expense of the thiol amino acid cysteine (Cys) oxidation to the disulfide form cystine (CySS). To regenerate the CySS/Cys redox shuttle, the photooxidative catalyst, TiO2 loaded with cocatalyst Mn(II) phthalocyanine (MnPc), couples water oxidation to CySS reduction. The combined system M. thermoacetica–CdS + TiO2–MnPc demonstrates a potential biomimetic approach to complete oxygenic solar-to-chemical production
Sang W. Joo - One of the best experts on this subject based on the ideXlab platform.
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conductivity inversion of zno nanoparticles in zno carbon nanofiber hybrid thin film devices by surfactant assisted c doping and non rectifying non linear electrical properties via interfacial trap induced tunneling for stress grading applications
Journal of Applied Physics, 2019Co-Authors: G.r. Dillip, Arghya Narayan Banerjee, Sang W. JooAbstract:A special nonrectifying, nonlinear current–voltage characteristic is observed in ZnO nanoparticle-anchored carbon nanofiber (ZnO-CNF) hybrid thin film devices, which has interesting applications in nonlinear stress-grading materials for high-voltage devices and overvoltage protectors in multifunctional electronic circuits. A simple chemical precipitation method is used to fabricate the hybrid films, followed by vacuum annealing at elevated temperatures. Interestingly, the organic surfactant (Triton X-114), used as a binder during the film deposition, manifests unintentional carbon doping into a ZnO lattice, which leads to a conductivity inversion of ZnO from n-type in the lower temperature (300 °C) annealed hybrid into p-type in the higher temperature (600 °C) annealed film. Electrical characterizations reveal that the CNF-ZnO interfaces act as a metal-Semiconductor Junction with low barrier height, leading to nonrectifying Junction properties. Also, the surfactant-induced C-atoms create trap states at the interface which “emit” the trapped charges via interfacial field-assisted tunneling, thus imposing nonlinearity (in both forward and reverse directions) on the I–V curves.
Rafi Shikler - One of the best experts on this subject based on the ideXlab platform.
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measuring minority carrier diffusion length using a kelvin probe force microscope
Physical Review B, 2000Co-Authors: Rafi Shikler, T Meoded, N Fried, Y RosenwaksAbstract:A method based on Kelvin probe force microscopy for measuring minority-carrier diffusion length in Semiconductors is described. The method is based on measuring the surface photovoltage between the tip of an atomic force microscope and the surface of an illuminated Semiconductor Junction. The photogenerated carriers diffuse to the Junction and change the contact potential difference between the tip and the sample, as a function of the distance from the Junction. The diffusion length L is then obtained by fitting the measured contact potential difference using the minority-carrier continuity equation. The method was applied to measurements of electron diffusion length in GaP $\mathrm{pn}$ and Schottky Junctions. The measured diffusion length was found to be $\ensuremath{\sim}2 \ensuremath{\mu}\mathrm{m},$ in good agreement with electron beam induced current measurements.
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direct measurement of minority carriers diffusion length using kelvin probe force microscopy
Applied Physics Letters, 1999Co-Authors: T Meoded, Rafi Shikler, N Fried, Y RosenwaksAbstract:We report on the use of Kelvin force microscopy as a method for measuring very short minority carrier diffusion length in Semiconductors. The method is based on measuring the surface photovoltage between the tip of an atomic force microscope and the surface of an illuminated Semiconductor Junction. The photogenerated carriers diffuse to the Junction, and change the contact potential difference between the tip and the sample as a function of the distance from the Junction edge. The diffusion length L is then obtained by fitting the measured contact potential difference using the minority carrier continuity equation. The method is applied to measurements of electron diffusion lengths in GaP epilayers.
