Tunable Plasmon-Induced Charge Transport and Photon
Absorption of Bimetallic Au–Ag Nanoparticles on ZnO Photoanode
for Photoelectrochemical Enhancement under Visible Light
Posted on 2020-06-19 - 00:43
Noble
metal nanostructures have been widely explored as an effective
method to increase photon absorption and charge separation in plasmonic
photocatalysis. In this study, we integrated two different noble metals,
gold (Au) and silver (Ag), into Au/Ag bimetallic nanoparticles (BNPs)
via solid-state thermal dewetting to investigate the room-temperature
electrical conductivity, visible light absorption, and its effect
on photoelectrochemical (PEC) activity. The Au/Ag BNPs give rise to
extended visible light absorption range, exhibiting localized surface
plasmon resonance (LSPR) effect that lead to strong surface-enhanced
Raman spectroscopy. X-ray photoelectron spectroscopy shows binding
energy shift in Au/Ag BNPs, suggesting electron transfer from Ag to
Au where charge transport behavior can be tailored. Kelvin probe force
microscopy and conductive atomic force microscopy displayed a significantly
enhanced electrical conduction in Au/Ag BNPs due to the lowered Schottky
barrier height. When the Au/Ag BNPs are incorporated onto ZnO semiconductor
photoanode, the photoactivity was improved with lower charge transport
resistance compared to monometallic and pristine ZnO. This work delivers
a general approach to understand the plasmon-induced charge interaction,
hence the photochemistry of noble metal BNP/semiconductor photoanode
by incorporating a controllable composition ratio, which is capable
of exploiting the enhanced electrical conduction and LSPR effect for
PEC water splitting.
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Lim, Fang Sheng; Tan, Sin Tee; Zhu, Yuanmin; Chen, Jhih-Wei; Wu, Bao; Yu, Hao; et al. (2020). Tunable Plasmon-Induced Charge Transport and Photon
Absorption of Bimetallic Au–Ag Nanoparticles on ZnO Photoanode
for Photoelectrochemical Enhancement under Visible Light. ACS Publications. Collection. https://doi.org/10.1021/acs.jpcc.0c03967
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AUTHORS (13)
FL
Fang Sheng Lim
ST
Sin Tee Tan
YZ
Yuanmin Zhu
JC
Jhih-Wei Chen
BW
Bao Wu
HY
Hao Yu
JK
Jung-Mu Kim
RG
Riski Titian Ginting
KL
Kam Sheng Lau
CC
Chin Hua Chia
HW
HengAn Wu
MG
Meng Gu
WC
Wei Sea Chang
KEYWORDS
Photon Absorptionbinding energy shiftSchottky barrier heightBNPcharge transport resistancelight absorptionplasmon-induced charge interactionelectron transferplasmonic photocatalysisPEC water splittingcomposition ratiosurface-enhanced Raman spectroscopycharge separationlight absorption rangeTunable Plasmon-Induced Charge Transportincrease photon absorptionZnO PhotoanodePhotoelectrochemical EnhancementVisible Light Noble metal nanostructuressurface plasmon resonanceZnO semiconductor photoanodecharge transport behaviorforce microscopyLSPR effectX-ray photoelectron spectroscopyKelvin probe force microscopy