Citation: Lai Yujian, Dong Lijie, Liu Rui, Lu Shaoyu, He Zuoliang, Shan Wanyu, Geng Fanglan, Cai Yaqi, Liu Jingfu. Synthesis of highly-branched Au@AgPd core/shell nanoflowers for in situ SERS monitoring of catalytic reactions[J]. Chinese Chemical Letters, ;2020, 31(9): 2437-2441. doi: 10.1016/j.cclet.2020.04.050 shu

Synthesis of highly-branched Au@AgPd core/shell nanoflowers for in situ SERS monitoring of catalytic reactions

Lai Yujian ^a,b ,
Dong Lijie ^a,b ,
Liu Rui ^a ,
Lu Shaoyu ^a,b ,
He Zuoliang ^a,b ,
Shan Wanyu ^a,b ,
Geng Fanglan ^a ,
Cai Yaqi ^a,b ,
Liu Jingfu ^a,b,c,*,

a.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
b.
University of Chinese Academy of Sciences, Beijing 100049, China
c.
School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China

jfliu@rcees.ac.cn

Received Date: 25 February 2020
Revised Date: 24 April 2020
Accepted Date: 27 April 2020
Available Online: 5 May 2020

Figures(6)

Alloy and small size nanostructures are favorable to catalytical performance, but not to surface-enhanced Raman spectroscopy (SERS) applications. Integrating SERS and catalytic activity into the nanocrystals with both alloy and small size structures is of great interest in fabrication of SERS platform to in situ monitor catalytical reaction. Herein, we report a facile method to synthesize Au@AgPd trimetallic nanoflowers (Au@AgPd NFs) with both SERS and catalytic activities, through simultaneous selective growth of Ag and Pd on Au core to form highly-branched alloy shell. These nanocrystals have the properties of small sizes, defects abundance, and highly-dispersed alloy shell which offer superior catalytic activity, while the merits of monodisperse, excellent stability, and highly-branched shell and core/alloy-shell structure promise the enhanced SERS activity. We further studied their growth mechanisms, and found that the ratio of Ag to Pd, sizes of Au core, and surfactant cetyltrimethylammonium bromide together determine this special structure. Using this as-synthesized nanocrystals, a monolayer bifunctional platform with both SERS and catalytical activity was fabricated through selfassembly at air/water interface, and applied to in situ SERS monitoring the reaction process of Pd-catalyzed hydrogenation of 4-nitrothiophenol to 4-aminothiophenol.
- Nanoflower,
- SERS,
- Bifunctional platform,
- AgPd alloy,
- Growth mechanism
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沈阳化工大学材料科学与工程学院沈阳 110142