Electrochemistry on a Localized Surface Plasmon Resonance Sensor
Electrochemistry on a Localized Surface Plasmon Resonance Sensor
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DOI：
10.1021/la9042342
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发表时间：
2010-05-18
期刊：
影响因子：
3.9
通讯作者：
Dahlin, Andreas B.
中科院分区：
文献类型：
--
作者：
Sannomiya, Takumi;Dermutz, Harald;Dahlin, Andreas B.
研究了基于局域表面等离子体共振（LSPR）的电化学传感器的光信号。将金纳米颗粒固定在铟锡氧化物（ITO）基底上，其用作工作电极。使用循环伏安法与LSPR传感同步，在金的表面反应进行了检测电和光学。在电容性充电机制中，检测到与所施加的电势成线性的光学信号。金被发现是溶解以上的氧化电位和部分再沉积在还原过程中，这改变了大小和构象的金纳米粒子。在动力学测量中，在较低的盐浓度下观察到较慢的电位建立。多重多极程序（MMP）的模拟表明，即使在反应电位以下，金的电荷耗尽和负离子吸附的结合也会形成损耗层。我们认为这里提出的结果的重要性，任何未来的传感器的基础上结合等离子体和电化学。
The optical signal of a localized surface plasmon resonance (LSPR)-based sensor combined with electrochemistry was investigated. Gold nanoparticles were immobilized on an indium till oxide (ITO) substrate, which functioned as working electrode. Using cyclic voltammetry synchronized with LSPR sensing, surface reactions on gold were detected both electrically and optically. In the capacitive charging regime, optical signals linear to the applied potential were detected. Gold was found to be dissolved above the oxidation potential and partially redeposited during the reduction, which changed size and conformation of the gold nanoparticles. In kinetic measurements, slower potential establishment was observed at lower salt concentrations. Simulations by multiple multipole program (MMP) suggested the formation of a lossy layer by combination of charge depletion of gold and negative ion adsorption even below the reaction potential. We consider the results presented here of importance for any future sensors based on combined plasmonics and electrochemistry.