Optical properties of CdSe and CdSe/ZnS quantum dots dispersed in solvents of different polarity

Abazović, Nadica D.; Kuljanin-Jakovljević, J.; Čomor, Mirjana I.

doi:10.1134/s0036024409090167

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…Ligand type can affect the properties of the colloid in many ways, including photoluminescent intensity ,− and lifetimes, − as well as suspension stability − among others. Also, proper selection of ligands can greatly influence the ease with which ligand exchange reactions proceed during further processing of the colloid. ,,,− …”

Section: Preparation Of Nanostructured Semiconductor Filmsmentioning

confidence: 99%

“…Also, proper selection of ligands can greatly influence the ease with which ligand exchange reactions proceed during further processing of the colloid. 255,258,259,[266][267][268][269][270][271][272] One-dimensional architecture of oxide films (e.g., TiO 2 and ZnO) has also been the subject of many investigations. Both bottom-up and top-down approaches have been extensively studied in this regard.…”

Section: Semiconductor Oxides and Chalcogenidesmentioning

confidence: 99%

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Beyond Photovoltaics: Semiconductor Nanoarchitectures for Liquid-Junction Solar Cells

et al. 2010

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He earned his doctoral degree (1979) in Physical Chemistry from the Bombay University and carried out postdoctoral research at Boston University (1979University ( -1981 and University of Texas at Austin (1981Austin ( -1983. He joined Notre Dame in 1983 and initiated a successful research project on utilizing semiconductor nanostructures for light energy conversion. His major research interests are in three areas: (1) to understand interfacial processes and catalytic reactions at nanostructured semiconductor interface, (2) to develop semiconductor hybrid assemblies for solar cells and solar fuels, and (3) carbon nanostructure architectures for energy conversion and storage. He has authored more than 350 peer-reviewed journal papers, review articles, and book chapters with more than 20000 citations. He has also edited three books in the area of nanoscale materials.Kevin Tvrdy (far left) received his Bachelor's degree in Chemistry from the University of Nebraska in 2005, after which he worked for one year at Streck Laboratories as an R&D technician. He is currently pursuing his doctoral degree at the University of Notre Dame in the Department of Chemistry and Biochemistry under the direction of Prashant V. Kamat. His current research centers on the application of ultrafast spectroscopic measurements to better understand and improve upon electron transfer phenomena in photovoltaic devices. In his free time, Kevin enjoys spending time with his wife Jessica outdoors. David R. Baker (far right) is a Ph.D. candidate in the Department of Chemical and Biomolecular Engineering at the University of Notre Dame, and Radiation Laboratory. He earned his Bachelor's degree in Chemical Engineering at the University of Washington in 2006, where he researched interfacial water phenomena and methylotrophic bacterial populations. His current research focuses on electrode-electrolyte interactions and developing nanoarchitectures within quantum dot solar cells. He has interned with the Jet Propulsion Laboratory and the United States Department of State. Emmy J. Radich (not pictured) is a P h.D. student in the Department of Chemical and Biomolecular Engineering at the University of Notre Dame where she works under the guidance of Prashant Kamat in the Notre Dame Radiation Laboratory. Her current focus is on carbon-based nanostructured composite materials for energy applications. Emmy earned her Bachelor's and Master's degrees in Chemical Engineering from the Dave C. Swalm School of Chemical Engineering at Mississippi State University. She also spent four years working at RespirTek, Inc., a commercial bioenvironmental laboratory. Emmy's research interests are diverse, with past projects focusing on biofuels synthesis, gas hydrates, anaerobic digestion, and novel bioremediation strategies. Emmy has also worked in various government and industrial positions ranging from groundwater assessment/ remediation regulator to a refinery process engineer to laboratory director. convert light energy into electricity. 7-10 Unlike solid state photovolt...

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Section: Preparation Of Nanostructured Semiconductor Filmsmentioning

confidence: 99%

Section: Semiconductor Oxides and Chalcogenidesmentioning

confidence: 99%

Beyond Photovoltaics: Semiconductor Nanoarchitectures for Liquid-Junction Solar Cells

et al. 2010

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“…In an attempt to improve the photostability, CdS–Ni electrodes were coated with ZnS passivation layer to minimize electron–hole recombination at surface trap sites while also providing additional protection to the CdS layer from water-mediated photocorrosion reactions. ZnS was deposited onto the photoanode via SILAR between the CdS and Ni(OH) 2 , since its effects are well-established on the passivation of chalcogenide surfaces. ,− Figure C shows the beneficial effect of the ZnS passivation by increasing the photocurrent in the LSV scans relative to Figure A. The photocurrent density slightly increased with increasing cycles of ZnS (a–f in Figure C), which is expected considering the passivation effects imparted to the photoanode.…”

Section: Resultsmentioning

confidence: 76%

“…Here we extend the light absorption of the TiO 2 –Ni(OH) 2 photoelectrode through photosensitization with CdS nanocrystals. CdS-sensitized TiO 2 has been researched extensively as photoanode in quantum dot sensitized solar cells. − CdS was also an early candidate for solar water splitting, given its straddled conduction and valence band positions relative to the water reduction and oxidation potentials. − However, OER cannot compete with the water-mediated photocorrosion reaction at the electrode–electrolyte interface, leading to electrode disintegration and failure. − The current approach represents a maiden effort in developing a midband gap semiconductor-catalyst architecture (CdS–Ni(OH) 2 ) that can harness urea as sacrificial electron donor for the sustainable production of hydrogen by side-stepping OER. We probed the charge-carrier transfer and recombination kinetics to provide insight into the photoelectrochemical performance of the semiconductor-catalyst architecture.…”

Section: Introductionmentioning

confidence: 99%

Ni(OH)₂ as Hole Mediator for Visible Light-Induced Urea Splitting

et al. 2018

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Urea is a small molecule produced in millions of tons per day and is ubiquitous in nature. Biological treatment is commonly used to oxidize the urea wastewater produced each day across the world, which produces additional solid waste and eliminates any potential for utilizing the stored chemical energy within. A solar waste-to-fuels concept is presented to synergistically produce hydrogen fuel from visible sunlight while remediating urea wastewaters. A cascade semiconductor-catalyst electrode assembly was designed to drive the photoconversion of urea to hydrogen. Proper band energy alignment facilitates catalyst activation via hole transfer across the semiconductor–catalyst interface. Specifically CdS-sensitized TiO2 with Ni(OH)2 urea electrocatalyst on fluorine-doped tin oxide coated glass was employed as photoanode. The steady-state response of the semiconductor–catalyst electrode is investigated in a photoelectrochemical cell, and charge transfer and recombination kinetics are elucidated to identify limiting charge-transfer reactions within the electrode architecture. Back electron transfer from semiconductor to catalyst is found to be competitive with urea oxidation reaction, which hinders steady-state photoconversion efficiency. Furthermore, the photoanode rapidly decomposes in urea electrolyte solutions as a result of the water-mediated photocorrosion of chalcogenide electrodes. Passivation of CdS with ZnS prior to catalyst deposition significantly improves open-circuit potential and photostability.

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Influence of the solvent environments on the spectral features of CdSe quantum dots with and without ZnS shell

Ibnaouf

Prasad

Salhi

et al. 2014

Journal of Luminescence

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Optical properties of CdSe and CdSe/ZnS quantum dots dispersed in solvents of different polarity

Cited by 5 publications

References 8 publications

Beyond Photovoltaics: Semiconductor Nanoarchitectures for Liquid-Junction Solar Cells

Beyond Photovoltaics: Semiconductor Nanoarchitectures for Liquid-Junction Solar Cells

Ni(OH)₂ as Hole Mediator for Visible Light-Induced Urea Splitting

Influence of the solvent environments on the spectral features of CdSe quantum dots with and without ZnS shell

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Optical properties of CdSe and CdSe/ZnS quantum dots dispersed in solvents of different polarity

Cited by 5 publications

References 8 publications

Beyond Photovoltaics: Semiconductor Nanoarchitectures for Liquid-Junction Solar Cells

Beyond Photovoltaics: Semiconductor Nanoarchitectures for Liquid-Junction Solar Cells

Ni(OH)2 as Hole Mediator for Visible Light-Induced Urea Splitting

Influence of the solvent environments on the spectral features of CdSe quantum dots with and without ZnS shell

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Product

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Ni(OH)₂ as Hole Mediator for Visible Light-Induced Urea Splitting