journal article·2020-07-02Open access

Tunable Plasmon-Induced Charge Transport and Photon Absorption of Bimetallic Au–Ag Nanoparticles on ZnO Photoanode for Photoelectrochemical Enhancement under Visible Light

Fang Sheng Lim, Sin Tee Tan, Yuanmin Zhu, Jhih-Wei Chen, Bao Wu, Hao Yu, Jung-Mu Kim, Riski Titian Ginting, Kam Sheng Lau, Chin Hua Chia, HengAn Wu, Meng Gu, Wei Sea Chang

The Journal of Physical Chemistry C· Volume 124· Issue 26

Abstract

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.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Gold and Silver Nanoparticles Synthesis and Applications · Copper-based nanomaterials and applications · ZnO doping and properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Advanced Engineering Platform, Mechanical Engineering Discipline, School of Engineering, Monash University, Bandar Sunway, Selangor 45700, Malaysia

Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia

SUSTech Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, China

Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China

Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan

CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, CAS Center for Excellence in Complex System Mechanics, University of Science and Technology of China, Hefei 230027, China

Division of Electronic Engineering, Jeonbuk National University, Jeonju 54896, Republic of Korea

Department of Electrical Engineering, Universitas Prima Indonesia, Medan 20118, Indonesia

Materials Science Program, Department of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Malaysia

Department of Mechanical Engineering and Research Center for Intelligence Medical Devices, Ming Chi University of Technology, New Taipei City 24301, Taiwan

Funding

Monash University Malaysia

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