Journal
CRYSTENGCOMM
Volume 24, Issue 36, Pages 6392-6399Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ce00962e
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Categories
Funding
- Natural Science Foundation of China [21701100]
- Young Innovative Talents Introduction & Cultivation Program for Colleges and Universities of Shandong Province (Department of Education of Shandong Province, Sub-Title: Innovative Research Team on Optoelectronic Functional Materials)
- Doctoral Startup Research Funding [2020BSZX01]
- Hundred Outstanding Talent Program of Jining University [2020ZYRC05]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
- Joint International Research Laboratory of Carbon-Based Functional Materials and Devices
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In this study, Au-Ag Janus nanoparticles (JNPs) with tunable sizes were successfully synthesized, exhibiting multiple plasmonic absorptions. Doping the surface of Au seeds with Pt/Ag atoms introduced lattice strain, crucial for facilitating the anisotropic deposition of Ag. The resulting Au-Ag Janus nanoparticles exhibited more plasmonic absorption peaks compared to core-shell counterparts, showing enhanced catalytic properties.
Noble metal Janus nanocrystals involving components with the same crystal structure and close lattice constants are technically difficult to produce as anisotropic growth is not favored under general deposition conditions. Herein, taking Au and Ag, we describe a feasible synthetic strategy to create Au-Ag Janus nanoparticles (JNPs) with tunable sizes, which exhibit multiple plasmonic absorptions in the UV-vis range. The success of the current synthesis lies in the surface doping of trisoctahedral (TOH) Au seeds with limited amount of Pt/Ag atoms to introduce a relatively large lattice strain during the seeded growth, which is found crucial to facilitate the anisotropic deposition of Ag. In contrast, the use of undoped Au seeds leads to the formation of Au@Ag core-shell nanoparticles. The size of resulting products could be tuned by varying the amount of the added Ag precursor or the size/quantity of Au seeds. Compared to core-shell counterparts, the current Au-Ag Janus nanoparticles exhibit more plasmonic absorption peaks. Owing to such advantages, the current Au-Ag Janus nanoparticles show enhanced catalytic properties in the reduction of 4-nitrophenol under UV-vis light irradiation. The current study provides a feasible strategy that allows the fabrication of Janus bimetallic nanocrystals with elements having a close lattice constant and validates the promising use as plasmonic catalysts, which could be potentially extended to other metals or alloys.
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