材料科学
拉曼光谱
表面增强拉曼光谱
纳米球光刻
激发
平版印刷术
吸收(声学)
吸收光谱法
光谱学
纳米技术
光化学
光电子学
拉曼散射
光学
化学
制作
工程类
替代医学
复合材料
病理
物理
电气工程
医学
量子力学
作者
Zixuan Wu,Jianxun Liu,Zhenming Wang,Lei Chen,Yiwei Xu,Zongjun Ma,Delai Kong,Dan Luo,Yan Liu
出处
期刊:Biosensors
[Multidisciplinary Digital Publishing Institute]
日期:2023-08-17
卷期号:13 (8): 825-825
被引量:1
摘要
We demonstrated a low-cost, highly sensitive hybrid Ag-Cu substrate with enhanced absorption for the excitation laser beam via the nanosphere lithography technique. The hybrid Ag-Cu surface-enhanced Raman spectroscopy (SERS) substrate consists of a Cu nanoarray covered with Ag nanoparticles. The geometry of the deposited Cu nanoarray is precisely determined through a self-assembly nanosphere etching process, resulting in optimized absorption for the excitation laser beam. Further Raman enhancement is achieved by incorporating plasmonic hotspots formed by dense Ag nanoparticles, grown by immersing the prepared Cu nanoarray in a silver nitrate solution. The structural design enables analytical enhancement factor of hybrid Ag-Cu SERS substrates of 1.13 × 105. The Ag-Cu SERS substrates exhibit a highly sensitive and reproducible SERS activity, with a low detection limit of 10-13 M for Rhodamine 6G detection and 10-9 M for 4,4'-Bipyridine. Our strategy could pave an effective and promising approach for SERS-based rapid detection in biosensors, environmental monitoring and food safety.
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