Shao Mingrui, Zhang Chao, Yu Jing, Jiang Shouzhen, Zhao Xiaofei, Li Zhaoxiang, Lu Weixi, Man Baoyuan, Li Zhen
Opt Express. 2021 Aug 30;29(18):28664-28679. doi: 10.1364/OE.435627.
The rhenium disulphide (ReS) nanocavity-based surface enhanced Raman scattering (SERS) substrates ware fabricated on the gold-modified silicon pyramid (PSi) by thermal evaporation technology and hydrothermal method. In this work, the ReS nanocavity was firstly combined with metal nanostructures in order to improve the SERS properties of ReS materials, and the SERS response of the composite structure exhibits excellent performance in sensitivity, uniformity and repeatability. Numerical simulation reveals the synergistic effect of the ReS nanocavity and the plasmon resonance generated by the metal nanostructures. And the charge transfer between the metal, ReS and the analytes was also verified and plays an non-ignorable role. Besides, the plasmon-driven reaction for p-nitrothiophenol (PNTP) to p,p'-dimercaptobenzene (DMAB) conversion was successfully in-situ monitored. Most importantly, it is found for the first time that the SERS properties of ReS nanocavity-based substrates are strongly temperature dependent, and the SERS effect achieves the best performance at 45 °C. In addition, the low concentration detection of malachite green (MG) and crystal violet (CV) molecules in lake water shows its development potential in practical application.
采用热蒸发技术和水热法，在金修饰的硅金字塔（PSi）上制备了基于二硫化铼（ReS）纳米腔的表面增强拉曼散射（SERS）基底。在这项工作中，首次将ReS纳米腔与金属纳米结构相结合，以改善ReS材料的SERS性能，复合结构的SERS响应在灵敏度、均匀性和重复性方面表现出优异的性能。数值模拟揭示了ReS纳米腔与金属纳米结构产生的等离子体共振的协同效应。并且还验证了金属、ReS与分析物之间的电荷转移，其起着不可忽视的作用。此外，成功地原位监测了等离子体驱动的对硝基硫酚（PNTP）向对，对'-二巯基苯（DMAB）的转化反应。最重要的是，首次发现基于ReS纳米腔的基底的SERS性能强烈依赖于温度，并且SERS效应在45℃时达到最佳性能。此外，对湖水中孔雀石绿（MG）和结晶紫（CV）分子的低浓度检测显示了其在实际应用中的发展潜力。
