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Morphology-Controlled Fabrication of Large-Scale Dendritic Silver Nanostructures for Catalysis and SERS Applications

Authors :
Zi-Qiang Cheng
Zhi-Wen Li
Jing-Han Xu
Rui Yao
Zong-Lin Li
Shan Liang
Guang-Ling Cheng
Yan-Hong Zhou
Xin Luo
Jiang Zhong
Source :
Nanoscale Research Letters, Vol 14, Iss 1, Pp 1-7 (2019)
Publication Year :
2019
Publisher :
SpringerOpen, 2019.

Abstract

Abstract Highly branched metallic nanostructures, which possess a large amount of catalyst active sites and surface-enhanced Raman scattering (SERS) hot spots owing to their large surface areas, multi-level branches, corners, and edges, have shown potential in various applications including catalysis and SERS. In this study, well-defined dendritic silver (Ag) nanostructures were prepared by a facile and controllable electrochemical deposition strategy. The morphology of Ag nanostructures is controlled by regulating electrodeposition time and concentration of AgNO3 in the electrolyte solution. Compared to conventional Ag nanoparticle films, dendritic Ag nanostructures exhibited larger SERS enhancement ascribed to the numerous hot spots exist in the nanogaps of parallel and vertically stacked multilayer Ag dendrites. In addition, the prepared dendritic Ag nanostructures show 3.2-fold higher catalytic activity towards the reduction of 4-nitrophenol (4-NP) by NaBH4 than the Ag nanoparticle films. The results indicate that the dendritic Ag nanostructures represent a unique bifunctional nanostructure that serves as both efficient catalysts and excellent SERS substrates, which may be further employed as a nanoreactor for in situ investigation and real-time monitoring of catalytic reactions by SERS technique.

Details

Language :
English
ISSN :
19317573 and 1556276X
Volume :
14
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Nanoscale Research Letters
Publication Type :
Academic Journal
Accession number :
edsdoj.99fd5be2110d4d3b8ef292d05d122d93
Document Type :
article
Full Text :
https://doi.org/10.1186/s11671-019-2923-0