Formation and Properties of Cu2O Semiconductor Colloids

T. Rajh; O. I. Mićić; A. J. Nozik

doi:10.1021/la00070a018

Formation and Properties of Cu2O Semiconductor Colloids

T. Rajh, O. I. Mićić, A. J. Nozik

Chemistry and Nanoscience

University of Belgrade

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

6 Scopus Citations

Abstract

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 language	American English
Pages (from-to)	477-480
Number of pages	4
Journal	Langmuir
Volume	2
Issue number	4
DOIs	https://doi.org/10.1021/la00070a018 https://doi.org/10.1021/la00070a018
State	Published - 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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title = "Formation and Properties of Cu2O Semiconductor Colloids",

abstract = "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.",

author = "T. Rajh and Mi{\'c}i{\'c}, {O. I.} and Nozik, {A. J.}",

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

year = "1986",

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doi = "10.1021/la00070a018",

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T1 - Formation and Properties of Cu2O Semiconductor Colloids

AU - Rajh, T.

AU - Mićić, O. I.

AU - Nozik, A. J.

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

PY - 1986/7/1

Y1 - 1986/7/1

N2 - 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.

AB - 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.

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U2 - 10.1021/la00070a018

DO - 10.1021/la00070a018

M3 - Article

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SN - 0743-7463

VL - 2

SP - 477

EP - 480

JO - Langmuir

JF - Langmuir

IS - 4

ER -

Formation and Properties of Cu2O Semiconductor Colloids

Abstract

Bibliographical note

NREL Publication Number

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