Li Chang, Chen Mingqiang
Analytical and Testing Center, Anhui University of Science and Technology 232001 Huainan China
School of Chemical Engineering, Anhui University of Science and Technology 232001 Huainan PR China.
RSC Adv. 2020 Nov 18;10(69):42030-42037. doi: 10.1039/d0ra08477h. eCollection 2020 Nov 17.
Revealing the sensitivity and selectivity of the Raman enhancement mechanism is extremely significant for disease diagnosis, environmental surveillance, and food safety supervision. In this study, chemical erosion copper triangle plates (CTPs) were employed as SERS substrate to detect the rhodamine B (Rh B) probe molecule at different etching times. A simple and cost-effective method affords unique insights into the surface enrichment of analytes, which could facilitate the high-performance SERS analysis of numerous analytes. The relationship between the Raman intensity and the concentration of Rh B follows the Freundlich model, which means that the wet-etching surface can create SERS-active site attachment Rh B molecules on the CTPs. The morphology of CTPs was modified by HO/HCl etchants; however, the composition of CTPs remained stable without oxidation. This proposes that the largest contribution to the enhancement was the hot-spots that can produce surface plasma resonance on the CTPs. The number of hot-spots can be intelligently adjusted by the artificial control of the surface morphology of metal materials, providing an unambiguous improvement in the SERS sensitivity and capability.
揭示拉曼增强机制的灵敏度和选择性对于疾病诊断、环境监测和食品安全监管具有极其重要的意义。在本研究中，采用化学腐蚀铜三角板（CTPs）作为表面增强拉曼散射（SERS）基底，在不同蚀刻时间检测罗丹明B（Rh B）探针分子。一种简单且经济高效的方法为分析物的表面富集提供了独特的见解，这有助于对众多分析物进行高性能SERS分析。拉曼强度与Rh B浓度之间的关系遵循弗伦德利希模型，这意味着湿法蚀刻表面可以在CTPs上创建吸附Rh B分子的SERS活性位点。CTPs的形态通过HO/HCl蚀刻剂进行了修饰；然而，CTPs的成分保持稳定，未发生氧化。这表明增强作用的最大贡献来自于能够在CTPs上产生表面等离子体共振的热点。通过人工控制金属材料的表面形态，可以智能地调节热点的数量，从而明确提高SERS的灵敏度和性能。
