Karlsruhe Institute of Technology (KIT), Institut für Anorganische Chemie, Engesserstraße 15, D-76131, Karlsruhe, Germany.
Department of Opto-Electronic Engineering, National Dong Hwa University, Hualien, 97401, Taiwan.
Mikrochim Acta. 2018 Jan 10;185(2):106. doi: 10.1007/s00604-017-2625-1.
This study introduces a two-step method for the deposition of branched silver nanowires (AgNWs) on fluorine-doped tin oxide (FTO) glass. This material serves as both an active surface-enhanced Raman-scattering (SERS) substrate and as an enzyme-free electrochemical sensor for HO. This dual functionality is systematically studied. The AgNWs as the main trunk were first deposited on FTO by spray-coating. Silver branches were then electrochemically produced on the preformed NWs. Scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectrometry were employed to characterize morphology, composition and microstructure. SERS experiments show that the branched AgNW/FTO substrate exhibits excellent performance in detecting 4-aminothiophenol at an ultra-low concentration of 0.1 fM. Simultaneously, this material displays an excellent electrocatalytic response to HO reduction at a concentration as low as 1 μM. The sensor has a rapid response and two linear analytical ranges that extend from 0.25 to 300 μM, and from 0.3 to 2.6 mM of HO, respectively. The ultrahigh sensitivity and satisfactory reproducibility highlights the merit of this hierarchical AgNW dendritic structure for sensing applications. Graphical abstract Branched silver nanowires can serve as both an active surface-enhanced Raman scattering substrate and as an electrochemical sensor for HO. This dual functionality is systematically investigated.
本研究提出了一种在掺氟氧化锡（FTO）玻璃上沉积支化银纳米线（AgNWs）的两步法。这种材料既可用作活性表面增强拉曼散射（SERS）基底，也可用作无酶电化学传感器来检测 HO。系统研究了这种双重功能。首先通过喷涂法将 AgNW 作为主枝沉积在 FTO 上，然后在预形成的 NW 上电化学生成银支。采用扫描电子显微镜、X 射线衍射和 X 射线光电子能谱对形貌、组成和微观结构进行了表征。SERS 实验表明，支化 AgNW/FTO 基底在检测超低浓度（0.1 fM）的 4-巯基苯胺方面表现出优异的性能。同时，该材料对 HO 还原具有优异的电催化响应，其浓度低至 1 μM。该传感器具有快速响应和两个线性分析范围，分别为 0.25 至 300 μM 和 0.3 至 2.6 mM 的 HO。超高的灵敏度和令人满意的重现性突出了这种分层 AgNW 树枝状结构在传感应用中的优势。
