Chemical-etched silver nanowires with tunable rough shape for surface enhanced Raman scattering

被引：9
作者：
Tang, Jing [1 ]
Sun, Huimin [2 ]
Li, Xiuting [2 ]
Liang, Fangchu [1 ]
Jiang, Tao [2 ]
机构：
[1] Ningbo Univ Technol, Inst Phys, Ningbo 315016, Zhejiang, Peoples R China
[2] Ningbo Univ, Sch Phys Sci & Technol, Ningbo 315211, Zhejiang, Peoples R China
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2021年 / 630卷
关键词：
Silver nanowires; Chemical etching; Rough surface; Quantitative detection; SERS; SPECTROSCOPY; POLYOL; NANOSTRUCTURES; TRANSPARENT; MECHANISM; NANOCUBES; TEMPLATE;
D O I：
10.1016/j.colsurfa.2021.127521
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Breaking the limitation of smooth silver nanowires (Ag NWs) in forming sufficient "hot spots" is a crucial step to push them into practical surface enhancement Raman scattering (SERS)-based detection. Herein, Ag NWs with various etched configurations were developed by utilizing different amounts of aqua regia as etchant at room temperature. Compared with the smooth Ag NWs, more electromagnetic "hot spots" were enabled by the etched one, which exhibited better sensitivity and uniformity in SERS signals. The limit of detection (LOD) for 2-naph-thalenethiol (2-NAT) obtained from the optimized substrate could reach 8.3 x 10(-10) mol/L and the relative standard deviation (RSD) was 6.8%. The maximum enhancement factor (EF) value obtained as 3.34 x 10(6) was even three times higher than that of the smooth one. Finally, an ultra-sensitive detection of thiram with a lowest detectable concentration of 4 x 10(-8) mol/L was facilitated by the optimal etched Ag NWs.
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页数：8
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