An ultra-sensitive SERS approach by electrostatic enrichment of charged analytes on Ag/laponite nanocomposites - Hao Zhang; Chaopeng Fu; Jianhao Ding; Guoqiang Xu; Chunhui Zhou; Zhenyu He; Zhimin Ou; Dongshen Tong; Minyang Qiu; Xiangdong Zhou; Xiaonian Li (Applied Clay Science, 2025)