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Nano Research

Article Title

Matryoshka-caged gold nanorods: Synthesis, plasmonic properties, and catalytic activity

Authors

Wei Xiong, Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia The Melbourne Centre for Nanofabrication, 151 Wellington Road, Clayton, VIC 3168, Australia Key Laboratory of Industrial Ecology and Environmental Engineering and State Key Laboratory of Fine Chemicals, School of Environmental Sciences and Technology, Dalian University of Technology, Dalian 116024, China
Debabrata Sikdar, Advanced Computing and Simulation Laboratory (AχL), Department of Electrical and Computer Systems Engineering, Monash University, Clayton, VIC 3800, Australia
Lim Wei Yap, Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia The Melbourne Centre for Nanofabrication, 151 Wellington Road, Clayton, VIC 3168, Australia
Pengzhen Guo, Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia The Melbourne Centre for Nanofabrication, 151 Wellington Road, Clayton, VIC 3168, Australia
Malin Premaratne, Advanced Computing and Simulation Laboratory (AχL), Department of Electrical and Computer Systems Engineering, Monash University, Clayton, VIC 3800, Australia
Xinyong Li, Key Laboratory of Industrial Ecology and Environmental Engineering and State Key Laboratory of Fine Chemicals, School of Environmental Sciences and Technology, Dalian University of Technology, Dalian 116024, China
Wenlong Cheng, Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia The Melbourne Centre for Nanofabrication, 151 Wellington Road, Clayton, VIC 3168, Australia

Keywords

matryoshka-caged gold nanorods, galvanic replacement reaction, 4-nitrophenol, catalysis, surface plasmon resonance

Abstract

Matryoshka-caged gold nanorods (mCGNRs) were successfully synthesized by alternating between a seed-mediated silver-coating method and galvanic replacement reactions (GRRs). As the number of matryoshka layers of the mCGNRs increased, the plasmon resonance peak broadened and was red-shifted, and the catalytic activity towards the reduction of 4-nitrophenol (4-NTP) increased. When mCGNRs with 6 layers were used as nanocatalysts in the reduction of 4-nitrophenol, the reaction rate coefficient was 5.2- and 3.7-times higher than that of the gold-nanorod- and caged-gold-nanorod-catalyzed reductions of 4-nitrophenol, respectively. In addition, the surface-plasmon-resonance-based absorption of light enhanced the catalytic performance of the mCGNRs. With the support of a polyurethane foam, the mCGNRs synthesized in this study can be applied as recyclable heterogeneous catalysts for the reduction of 4-nitrophenol.

Graphical Abstract

Publisher

Tsinghua University Press

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