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Realization of Tunable Localized Surface Plasmon Resonance of Cu@Cu2O Core–Shell Nanoparticles by the Pulse Laser Deposition Method
journal contribution
posted on 2019-08-23, 17:49 authored by Hongbu Yin, Yan Zhao, Xibin Xu, Jie Chen, Xuemin Wang, Jian Yu, Jin Wang, Weidong WuCu@Cu2O core–shell nanoparticles (NPs) not only possess a stabilized
structure but also exhibit better photocatalytic performance as compared
to pure Cu2O. Therefore, preparation of Cu@Cu2O core–shell NPs is key toward efficient photocatalysis applications.
In this paper, the fabrication of Cu@Cu2O core–shell
NPs on single-crystal MgO(100) substrates has been studied systematically
by pulse laser deposition. Scanning electron microscopy (SEM) images
show that the average diameter of NPs is enlarged from 89.9 to 150.3
nm with the increasing of oxygen pressure. Transmission electron microscopy
(TEM) images indicate that the NPs have elongated hexagons and a core–shell
structure with a shell thickness of about 10 nm. UV–vis absorption
spectra show that the position of the localized surface plasmon resonance
(LSPR) peaks shifts from 648 to 858 nm and the full width at half-maximum
(fwhm) of the LSPR peaks broadens from 226.7 to 436.5 nm with increasing
average diameter of NPs. According to the analysis, the red shift
of the LSPR peaks is caused by enlargement of the core diameter; higher
fwhm is a result of broadened particle size distribution and the elongated
morphology of NPs. Therefore, the width and range of LSPR peaks of
the absorption spectrum can be tuned using this method, which is beneficial
for enhancing the light absorption and improving the photocatalytic
efficiency of Cu@Cu2O core–shell NPs.