文献类型：期刊文献

英文题名：Innovative polydopamine modified black silicon/Ag substrates for sensitive SERS detection and enhancement mechanism

作者：Wang, Haobo[1];Liao, Wenfeng[1];Li, Yuxuan[1];Yi, Yuzhi[1];Yan, Chi[1];Tong, Hua[1];Ye, Xiaojun[1];Yuan, Xiao[1];Liu, Cui[1];Li, Hongbo[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2025

卷号：190

外文期刊名：MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING

收录：;EI(收录号：20250617811714);WOS:【SCI-EXPANDED(收录号:WOS:001423985500001)】；

语种：英文

外文关键词：SERS detection; Black silicon; PDA; Surface modification

摘要：Surface-enhanced Raman scattering (SERS) has gained recognition as a powerful analytical tool due to its exceptional sensitivity in detecting trace molecules, making it invaluable in fields such as environmental monitoring, biomedical diagnostics, and food safety. In this work, we prepared a 3D substrate by modifying black silicon (bSi) with polydopamine (PDA) and subsequently depositing Ag nanoparticles (AgNPs) on the surface. SERS measurements demonstrated that the bSi@PDA@Ag substrate exhibited great sensitivity and uniformity across a range of R6G concentrations, with characteristic peaks clearly identifiable at 10- 8 M concentrations. The results indicate that the bSi@PDA@Ag substrate possesses significant potential for effective SERS detection. The mechanism of the enhanced SERS signals is investigated. The incorporation of PDA improves the adsorption capacity for R6G molecules due to the increased reactive -OH and - NH2 groups. The density functional theory (DFT) calculations confirmed strong adsorption energies of R6G on the PDA surface, while electric field simulations illustrated localized hot-spots around the AgNPs, crucial for amplifying Raman signals.