Open AccessGraphene oxide as the passivation layer for Cu_xO photocatalyst on a plasmonic Au film and the corresponding photoluminescence study
Author(s) -
Yun Hsuan Chang,
Chih–Ming Wang,
Yu-Pin Hsu,
Yi Hao Pai,
Jia Yu Lin,
Chu Hsuan Lin
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.0a1245
Subject(s) - passivation , photoluminescence , materials science , graphene , oxide , photocatalysis , plasmon , surface plasmon , optoelectronics , light intensity , layer (electronics) , nanotechnology , optics , chemistry , catalysis , metallurgy , physics , biochemistry
The contribution of graphene oxide (GO) on photocatalytic effects of Cu(x)O on plasmonic Au is investigated. It is found that the H(2) evolution rate from pure water is enhanced 1.4 fold using the visible-active Cu(x)O/GO photocatalyst, as compared with Cu(x)O without GO. In addition, the intensity of photoluminescence of Cu(x)O/GO can be enhanced as much as 2.85 fold as compared with Cu(x)O without GO. The enhancement is due to the negative fixed charge in GO, which can passivate the surface of Cu(x)O and suppress recombination of minority electrons at the surface. The results from optical characterization in this study can help to prove the proposed mechanism of passivation.