Formation and Properties of Cu2O Semiconductor Colloids

T. Rajh, O. I. Mićić, A. J. Nozik

Research output: Contribution to journalArticlepeer-review

6 Scopus Citations


Cuprous oxide colloids were obtained by radiolytic reduction of Cu2+ ions in alkaline solutions in the presence of 0.05%, poly(vinyl alcohol). Methylviologen cation radicals, Eu2+ ions, and the organic radicals (CH3)2COH and C02 inject electrons into colloidal Cu2O. These electrons are first captured relatively rapidly by a mid-gap state in Cu2O, and then they reduce Cu+ to Cu0 in a slower second step. The energy level of the mid-gap state was measured as a function of pH by equilibrating it with the MV2+/MV+ redox couple. The mid-gap state is insensitive to pH, indicating it does not involve protonic equilibrium. Photoexcitation of aqueous Cu2O sols in the presence of MV2+ results in reduction of Cu2O to Cu0, rather than electron transfer to MV2+ in the solution. This photoreductive corrosion can be suppressed in acetonitrile sols.

Original languageAmerican English
Pages (from-to)477-480
Number of pages4
Issue number4
StatePublished - 1 Jul 1986

Bibliographical note

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

NREL Publication Number

  • ACNR/JA-236-10127


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