Enhanced Photoredox Chemistry in Quantized Semiconductor Colloids

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

Research output: Contribution to journalArticlepeer-review

177 Scopus Citations


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 languageAmerican English
Pages (from-to)12-13
Number of pages2
JournalJournal of Physical Chemistry
Issue number1
StatePublished - 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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