Size-controlled electron transfer and photocatalytic activity of ZnO-Au nanoparticle composites

Jaeil Lee, Hyeong Seop Shim, Myeongsoon Lee, Jae Kyu Song, Dongil Lee

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160 Citations (Scopus)

Abstract

This Letter describes size-controlled photocatalytic activity of ZnO nanoparticles coated with glutathione-protected gold nanoparticles with diameters of 1.1, 1.6, and 2.8 nm. The photocatalytic activity of the ZnO-Au composites was found to increase with increasing gold size for both oxidative and reductive catalytic reactions. Photoluminescence decay dynamics of the composites showed that the electron-transfer rate from the photoexcited ZnO to gold nanoparticle also increased as the gold size increased. These results demonstrate that the photogenerated electron transfer and the resulting catalytic activity of the composites can be controlled by the size of the mediating gold capacitors.

Original languageEnglish
Pages (from-to)2840-2845
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume2
Issue number22
DOIs
Publication statusPublished - 2011 Nov 17

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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