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Title: Spectrally resolved single particle photoluminescence microscopy reveals heterogeneous photocorrosion activity of cuprous oxide microcrystals
Authors: Lee, Jinn-Kye
Wu, Shuyang
Lim, Pei Chong
Zhang, Zhengyang
Keywords: Science::Chemistry
Issue Date: 2022
Source: Lee, J., Wu, S., Lim, P. C. & Zhang, Z. (2022). Spectrally resolved single particle photoluminescence microscopy reveals heterogeneous photocorrosion activity of cuprous oxide microcrystals. Nano Letters, 22(12), 4654-4660.
Project: RG4/19(S)
Journal: Nano Letters
Abstract: Photocorrosion of cuprous oxide (Cu2O) has notably limited its application as an efficient photocatalyst. We report a facile approach to visualize in situ formation of copper and oxygen vacancies on the Cu2O surface under ambient condition. By imaging photoexcited single Cu2O particles, the resultant photoluminescence generated at Cu2O surface enable effective localization of copper and oxygen vacancies. Single particle photoluminescence imaging showed substantial heterogeneity in the rate of defect formation at different facets with the truncated corners achieving the fastest initial rate of photooxidation before subsequently changing to the face and edge sites as the photocorrosion proceeds. The generation of copper or oxygen vacancy is proportional to the photoexcitation power, while pH-dependent studies rationalized alkaline conditions for the formation of copper vacancy. Reaction in an electron-hole scavenger system showed that photooxidation and photoreduction will simultaneously occur, yet heterogeneously on the surface of Cu2O, with rate of copper vacancy formation being fastest.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.2c00458
Schools: School of Physical and Mathematical Sciences 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © 2022 American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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