Enhanced Photoredox Chemistry in Quantized Semiconductor Colloids

J. M. Nedeljković; M. T. Nenadović; O. I. Mićić; A. J. Nozik

doi:10.1021/j100273a005

Enhanced Photoredox Chemistry in Quantized Semiconductor Colloids

J. M. Nedeljković, M. T. Nenadović, O. I. Mićić, A. J. Nozik

Chemistry and Nanoscience

University of Belgrade

Research output: Contribution to journal › Article › peer-review

177 Scopus Citations

Abstract

Optical effects due to size quantization have been observed for HgSe, PbSe, and CdSe colloids in water and acetonitrile with particle diameters of 20-100 Å. For diameters less than 50 Å, the optical absorption edge of HgSe and PbSe is blue shifted by several volts. The results are consistent with perturbation of the semiconductor band structure due to carrier confinement in very small particles resulting in an increase in the effective band gap. The redox potential of photogenerated carriers is greatly enhanced in such quantized semiconductor particles; reduction reactions that cannot occur in bulk materials can occur in sufficiently small particles. This has been demonstrated with H₂ evolution in 50-Å PbSe and HgSe colloids and CO₂ reduction in 50-Å CdSe colloids.

Original language	American English
Pages (from-to)	12-13
Number of pages	2
Journal	Journal of Physical Chemistry
Volume	90
Issue number	1
DOIs	https://doi.org/10.1021/j100273a005 https://doi.org/10.1021/j100273a005
State	Published - 1986

Bibliographical note

Work performed by Boris Kidric Institute of Nuclear Sciences, Belgrade, Yugoslavia and the Solar Energy Research Institute, Golden, Colorado

NREL Publication Number

ACNR/JA-236-7357

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title = "Enhanced Photoredox Chemistry in Quantized Semiconductor Colloids",

abstract = "Optical effects due to size quantization have been observed for HgSe, PbSe, and CdSe colloids in water and acetonitrile with particle diameters of 20-100 {\AA}. For diameters less than 50 {\AA}, the optical absorption edge of HgSe and PbSe is blue shifted by several volts. The results are consistent with perturbation of the semiconductor band structure due to carrier confinement in very small particles resulting in an increase in the effective band gap. The redox potential of photogenerated carriers is greatly enhanced in such quantized semiconductor particles; reduction reactions that cannot occur in bulk materials can occur in sufficiently small particles. This has been demonstrated with H2 evolution in 50-{\AA} PbSe and HgSe colloids and CO2 reduction in 50-{\AA} CdSe colloids.",

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doi = "10.1021/j100273a005",

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T1 - Enhanced Photoredox Chemistry in Quantized Semiconductor Colloids

AU - Nedeljković, J. M.

AU - Nenadović, M. T.

AU - Mićić, O. I.

AU - Nozik, A. J.

N1 - Work performed by Boris Kidric Institute of Nuclear Sciences, Belgrade, Yugoslavia and the Solar Energy Research Institute, Golden, Colorado

PY - 1986

Y1 - 1986

N2 - Optical effects due to size quantization have been observed for HgSe, PbSe, and CdSe colloids in water and acetonitrile with particle diameters of 20-100 Å. For diameters less than 50 Å, the optical absorption edge of HgSe and PbSe is blue shifted by several volts. The results are consistent with perturbation of the semiconductor band structure due to carrier confinement in very small particles resulting in an increase in the effective band gap. The redox potential of photogenerated carriers is greatly enhanced in such quantized semiconductor particles; reduction reactions that cannot occur in bulk materials can occur in sufficiently small particles. This has been demonstrated with H2 evolution in 50-Å PbSe and HgSe colloids and CO2 reduction in 50-Å CdSe colloids.

AB - Optical effects due to size quantization have been observed for HgSe, PbSe, and CdSe colloids in water and acetonitrile with particle diameters of 20-100 Å. For diameters less than 50 Å, the optical absorption edge of HgSe and PbSe is blue shifted by several volts. The results are consistent with perturbation of the semiconductor band structure due to carrier confinement in very small particles resulting in an increase in the effective band gap. The redox potential of photogenerated carriers is greatly enhanced in such quantized semiconductor particles; reduction reactions that cannot occur in bulk materials can occur in sufficiently small particles. This has been demonstrated with H2 evolution in 50-Å PbSe and HgSe colloids and CO2 reduction in 50-Å CdSe colloids.

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Enhanced Photoredox Chemistry in Quantized Semiconductor Colloids

Abstract

Bibliographical note

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