RT Journal Article
T1 Dual Synergistic Modulation of Photo-Induced Electron Transfer Processes Between Molecules and Gold Nanopillars for Ultrasensitive Plasmon-Enhanced Raman Scattering.
A1 Ansah, Iris
A1 Aranda, Daniel
A1 Jung, Ho
A1 Park, Sung-Gyu
A1 Kang, Mijeong
A1 Otero-Fernández-de-Molina, Juan Carlos
A1 Kim, Dong-Ho
K1 Efecto Raman de superficie intensificada
K1 Transferencia de carga
AB This work presents a synergistic approach to boost plasmon- or surface-enhanced Raman scattering (SERS) by combiningmolecular and electrical modulators that fine-tune the electronic structure of metal−molecule interfaces, especially thecharge transfer (CT) states, allowing molecular resonances. Paraquat (PQ2+) was interfaced with nanopillar SERS substrateswhose surface excess of charge was modulated by intercalating anionic Au complexes (AuCl4−, Au(CN)2−) as well as byapplying external electric potentials. Such concurrent dual modulation tuned the energy of the CT states of thesubstrate−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 mechanismfor 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 newphysicochemical variables affecting electron transfer processes in nanostructured metal-molecule interfaces and provides apath for further exploring chemical strategies for greater Raman enhancement and for developing ultrasensitive Ramanplatforms.
PB Royal Society of Chemistry
YR 2021
FD 2021-07-22
LK https://hdl.handle.net/10630/28340
UL https://hdl.handle.net/10630/28340
LA eng
NO J. Mater. Chem. C, 2021,9, 8842-8848
NO https://v2.sherpa.ac.uk/id/publication/25610 (Accepted version, pathway A)
NO Fundamental Research Program (PNK 7440) of the Korea Institute of Materials Science(KIMS)National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (NRF-2021R1C1C1010213)Junta de Andalucía/FEDER (UMA18-FEDERJA-049 and P18-RT-4592)Fundacion Ramon Areces (Madrid)
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026