Yang Chih-Ping, Fang Sheng-Uei, Yang Kuang-Hsuan, Chen Hsiao-Chien, Tsai Hui-Yen, Mai Fu-Der, Liu Yu-Chuan
Department of Biochemistry and Molecular Cell Biology, and Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, No. 250, Wuxing Street, Taipei 11031, Taiwan.
Division of Gastroenterology and Hepatology, Department of Internal Medicine, Taipei Medical University Hospital, No. 252, Wuxing Street, Taipei 11031, Taiwan.
ACS Omega. 2018 May 1;3(5):4743-4751. doi: 10.1021/acsomega.8b00494. eCollection 2018 May 31.
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 KFe(CN) 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.
传统上，水溶液中的反应是用去离子水（DI水）制备的，其性质与由四面体氢键网络构成的惰性“本体水”有关。在这项工作中，我们证明了在电化学反应中使用氢键减少的原位等离子体激活水（PAW）而非去离子水的显著优势，电化学反应通常受扩散和动力学控制。与基于去离子水的体系相比，原位PAW中KFe(CN)的扩散系数和电子转移速率常数分别可提高约35%和15%。这些优势促成了表面增强拉曼散射（SERS）性能的提升。基于原位PAW，罗丹明6G的SERS增强强度提高了两倍，且相应的低相对标准偏差为5%，这与文献中所示复杂过程的结果相当，甚至更好，令人鼓舞。
