材料科学
双金属片
合金
苦味酸
基质(水族馆)
表面等离子共振
拉曼光谱
检出限
等离子体子
纳米颗粒
分子
纳米技术
化学工程
分析化学(期刊)
光电子学
金属
冶金
光学
有机化学
色谱法
物理
地质学
工程类
化学
海洋学
作者
G. V. Pavan Kumar,R. K. Soni
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2020-10-06
卷期号:31 (50): 505504-505504
被引量:11
标识
DOI:10.1088/1361-6528/abb628
摘要
We have fabricated Ag-Au alloy nanocubes using the galvanic replacement of silver nanocubes by aqueous HAuCl4 and investigated their morphological, structural, compositional and optical properties. The inter-diffusion between silver and gold at 100 °C leads to the formation of Ag-Au alloy nanocubes with hollow interiors. A broad tuning of the surface plasmon resonance (SPR) wavelength from 624 nm to 920 nm is obtained with the varying volume of HAuCl4. When excited at wavelength 785 nm, the bimetallic Ag-Au nanocubes with pinholes exhibit two-fold Raman intensity enhancement compared to pristine Ag nanocubes. The surface-enhanced Raman spectroscopy (SERS) substrate prepared with Ag-Au alloy nanocubes shows high-intensity enhancement factor of 1.9 × 107 for 11.2 wt% Au content. The SERS-active Ag-Au alloy nanocubes substrates were exploited for the detection of two explosive molecules; p-nitrobenzoic acid (PNBA) and picric acid (PA). Remarkable detection sensitivity and ultra-low detection limit of 1.7 × 10-14 M for PNBA and 4.1 × 10-11 M for PA were obtained, demonstrating the very high SERS detection capabilities of the as-prepared substrate.
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