Unexpected Size Effect Observed in ZnO-Au Composite Photocatalysts

Noh Soo Han, Dukhan Kim, Jong Woon Lee, Jaehyun Kim, Hyeong Seop Shim, Yongjin Lee, Dongil Lee, Jae Kyu Song

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Abstract

Semiconductor-metal nanocomposites prepared with well-defined gold nanoclusters, such as Au25, Au144, and Au807, showed size-dependent photocatalytic activities for the reduction of nile blue and azobenzene. Whereas the photoreduction of nile blue was directly related with the charge separation and transfer rate from the photoexcited ZnO to gold nanoclusters, the photoreaction of azobenzene showed unexpected size effect with a clear threshold. Mechanistic investigations revealed that the photoreduction of azobenzene proceeded via a proton-coupled electron transfer process. The photocatalytic activity of the ZnO-Au nanocomposites was also dependent on the excitation intensity, demonstrating that the multielectron/multiproton process was controlled by the charge separation and transfer in the nanocomposites.

Original languageEnglish
Pages (from-to)1067-1072
Number of pages6
JournalACS Applied Materials and Interfaces
Volume8
Issue number2
DOIs
Publication statusPublished - 2016 Jan 20

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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    Han, N. S., Kim, D., Lee, J. W., Kim, J., Shim, H. S., Lee, Y., Lee, D., & Song, J. K. (2016). Unexpected Size Effect Observed in ZnO-Au Composite Photocatalysts. ACS Applied Materials and Interfaces, 8(2), 1067-1072. https://doi.org/10.1021/acsami.5b09987