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Title: Controllable corrosion-assisted fabrication of Au–Ag alloyed hollow nanocrystals for highly efficient and environmentally-stable SERS substrates

Abstract

Surface enhanced Raman scattering (SERS) substrates with both high activity and long term chemical-stability have been expected in the practical application of the SERS-based detection. In this paper, Au–Ag bimetal nanocrystals are fabricated based on the template-etching reaction in the Ag nanocubes-contained cetylpyridinium chloride (CPC) aqueous solution via adding the HAuCl 4 solution. The obtained nanocrystals are Au–Ag alloyed and hollow in structure. Further, it has been found that with the increasing Au/Ag molar ratio, the shape of the alloyed nanocrystals evolve from the truncated nanocubes to the hollow boxes and then nanocages, showing the ever red-shifting surface plasmon resonance from the visible to the infrared region. The formation of the alloyed hollow nanocrystals is attributed to the preferential dissolution of the Ag nanocubes induced by CPC selective adsorption and the three to one galvanic replacement reaction between Ag and Au atoms. Importantly, such Au–Ag alloyed hollow nanocrystals, especially the ones with a low Au/Ag atomic ratio, show both high SERS activity and long term environmental stability compared with pure Ag or Au nanocrystals, and are the ideal candidate for the SERS substrate with practical application value. As a result, this work not only demonstrates the nanofabrication route to themore » alloyed hollow nanocrystals with controllable shapes and tunable optical properties in a large region, but also presents highly active and chemically-stable SERS substrates for the practical SERS-based detection.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2];  [3];  [1];  [4]; ORCiD logo [1]
  1. Chinese Academy of Sciences, Hefei (People's Republic of China); Univ. of Science and Technology of China, Hefei (People's Republic of China)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Chinese Academy of Sciences, Hefei (People's Republic of China); Hefei Univ. of Technology, Anhui (People's Republic of China)
  4. Chinese Academy of Sciences, Hefei (People's Republic of China)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1478491
Report Number(s):
BNL-209183-2018-JAAM
Journal ID: ISSN 0957-4484
Grant/Contract Number:  
SC0012704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nanotechnology
Additional Journal Information:
Journal Volume: 29; Journal Issue: 45; Journal ID: ISSN 0957-4484
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; corrosion-assisted nanofabrication; Au–Ag alloyed hollow nanocrystals; highly active and chemically-stable SERS substrates

Citation Formats

Guo, Jing, Lu, Fang, Zhang, Yugang, Ma, Qilin, Yang, Shaosong, Liu, Guangqiang, and Cai, Weiping. Controllable corrosion-assisted fabrication of Au–Ag alloyed hollow nanocrystals for highly efficient and environmentally-stable SERS substrates. United States: N. p., 2018. Web. doi:10.1088/1361-6528/aade27.
Guo, Jing, Lu, Fang, Zhang, Yugang, Ma, Qilin, Yang, Shaosong, Liu, Guangqiang, & Cai, Weiping. Controllable corrosion-assisted fabrication of Au–Ag alloyed hollow nanocrystals for highly efficient and environmentally-stable SERS substrates. United States. doi:10.1088/1361-6528/aade27.
Guo, Jing, Lu, Fang, Zhang, Yugang, Ma, Qilin, Yang, Shaosong, Liu, Guangqiang, and Cai, Weiping. Fri . "Controllable corrosion-assisted fabrication of Au–Ag alloyed hollow nanocrystals for highly efficient and environmentally-stable SERS substrates". United States. doi:10.1088/1361-6528/aade27.
@article{osti_1478491,
title = {Controllable corrosion-assisted fabrication of Au–Ag alloyed hollow nanocrystals for highly efficient and environmentally-stable SERS substrates},
author = {Guo, Jing and Lu, Fang and Zhang, Yugang and Ma, Qilin and Yang, Shaosong and Liu, Guangqiang and Cai, Weiping},
abstractNote = {Surface enhanced Raman scattering (SERS) substrates with both high activity and long term chemical-stability have been expected in the practical application of the SERS-based detection. In this paper, Au–Ag bimetal nanocrystals are fabricated based on the template-etching reaction in the Ag nanocubes-contained cetylpyridinium chloride (CPC) aqueous solution via adding the HAuCl4 solution. The obtained nanocrystals are Au–Ag alloyed and hollow in structure. Further, it has been found that with the increasing Au/Ag molar ratio, the shape of the alloyed nanocrystals evolve from the truncated nanocubes to the hollow boxes and then nanocages, showing the ever red-shifting surface plasmon resonance from the visible to the infrared region. The formation of the alloyed hollow nanocrystals is attributed to the preferential dissolution of the Ag nanocubes induced by CPC selective adsorption and the three to one galvanic replacement reaction between Ag and Au atoms. Importantly, such Au–Ag alloyed hollow nanocrystals, especially the ones with a low Au/Ag atomic ratio, show both high SERS activity and long term environmental stability compared with pure Ag or Au nanocrystals, and are the ideal candidate for the SERS substrate with practical application value. As a result, this work not only demonstrates the nanofabrication route to the alloyed hollow nanocrystals with controllable shapes and tunable optical properties in a large region, but also presents highly active and chemically-stable SERS substrates for the practical SERS-based detection.},
doi = {10.1088/1361-6528/aade27},
journal = {Nanotechnology},
issn = {0957-4484},
number = 45,
volume = 29,
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
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