分析物
检出限
材料科学
贵金属
纳米技术
密度泛函理论
吸附
拉曼光谱
表面增强拉曼光谱
电化学
半导体
化学
拉曼散射
金属
光电子学
电极
物理化学
计算化学
物理
光学
色谱法
冶金
作者
Hongquan Xu,Yuchen Zhang,Zhong Lin Wang,Yuehan Jia,Xiaotian Yang,Ming Gao
标识
DOI:10.1016/j.jcis.2024.01.076
摘要
Surface-enhanced Raman spectroscopy (SERS) is an analytical technique with a broad range of potential applications in fields such as biomedicine, electrochemistry, and hazardous chemicals. However, it is challenging to develop SERS substrates that are both good sensitive and signal stable. Here we designed a superhydrophobic Nd doped MoS2 uniformly assembled on the activated carbon fiber cloth (CFC) to avoid the coffee ring effect and enrich the analyte, improving the enhancement factor (EF) to 3.9 × 109 and pesticide endosulfan (<10-10) analyte detection. We demonstrate our strategy by density-functional theory (DFT) calculations confirming that both adsorption energy and density of states are enhanced after doping Nd leading to SERS enhancement. Beside DFT calculations, our experiments also provide an effective means to demonstrate that the high SERS sensitivity is based on multiple charge transfer processes combined with the activated carbon cloth. Our results address the limitations of low sensitivity and limit of detection (LOD) of semiconductor SERS substrates for trace analysis and are a step towards practical applications.
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