2026-06-01T09:36:05Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/283402026-02-03T11:18:48Zcom_10630_2254col_10630_37953

Dual Synergistic Modulation of Photo-Induced Electron Transfer Processes Between Molecules and Gold Nanopillars for Ultrasensitive Plasmon-Enhanced Raman Scattering. Ansah, Iris Aranda, Daniel Jung, Ho Park, Sung-Gyu Kang, Mijeong Otero-Fernández-de-Molina, Juan Carlos Kim, Dong-Ho Efecto Raman de superficie intensificada Transferencia de carga This work presents a synergistic approach to boost plasmon- or surface-enhanced Raman scattering (SERS) by combining molecular and electrical modulators that fine-tune the electronic structure of metal−molecule interfaces, especially the charge transfer (CT) states, allowing molecular resonances. Paraquat (PQ2+) was interfaced with nanopillar SERS substrates whose surface excess of charge was modulated by intercalating anionic Au complexes (AuCl4−, Au(CN)2−) as well as by applying external electric potentials. Such concurrent dual modulation tuned the energy of the CT states of the substrate−anion−PQ2+ triads in resonance with the excitation laser, resulting in a large enhancement of the PQ2+ SERS bands. The results point to a novel coherent through-bond CT contribution of SERS, analogous to the superexchange mechanism for electron transfer in donor−bridge−acceptor systems. The large amplification enables high sensitivity for detecting PQ2+ and ultimately enables the on-site detection of PQ2+ in unprocessed real samples (coffee drink). This study account for new physicochemical variables affecting electron transfer processes in nanostructured metal-molecule interfaces and provides a path for further exploring chemical strategies for greater Raman enhancement and for developing ultrasensitive Raman platforms. 2023-12-18T13:58:24Z 2023-12-18T13:58:24Z 2023-12-18T13:58:24Z 2021-07-22 journal article J. Mater. Chem. C, 2021,9, 8842-8848 https://hdl.handle.net/10630/28340 10.1039/D1TC02163J eng open access Royal Society of Chemistry