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Surface-Enhanced Raman Scattering-Active Substrate Prepared with New Plasmon-Activated Water

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journal contribution
posted on 01.05.2018 by Chih-Ping Yang, Sheng-Uei Fang, Kuang-Hsuan Yang, Hsiao-Chien Chen, Hui-Yen Tsai, Fu-Der Mai, Yu-Chuan Liu
Conventionally, reactions in aqueous solutions are prepared using deionized (DI) water, the properties of which are related to inert “bulk water” comprising a tetrahedral hydrogen-bonded network. In this work, we demonstrate the distinguished benefits of using in situ plasmon-activated water (PAW) with reduced hydrogen bonds instead of DI water in electrochemical reactions, which generally are governed by diffusion and kinetic controls. Compared with DI water-based systems, the diffusion coefficient and the electron-transfer rate constant of K3Fe­(CN)6 in PAW in situ can be increased by ca. 35 and 15%, respectively. These advantages are responsible for the improved performance of surface-enhanced Raman scattering (SERS). On the basis of PAW in situ, the SERS enhancement of twofold higher intensity of rhodamine 6G and the corresponding low relative standard deviation of 5%, which is comparable to and even better than those based on complicated processes shown in the literature, are encouraging.