ETH Zurich, Institute for Biomedical Engineering, Zurich, Switzerland.
Nanoscale. 2013 Jun 7;5(11):4966-75. doi: 10.1039/c3nr34172k. Epub 2013 May 1.
Simultaneous LSPR and electronic sensing of potential induced ion adsorption onto gold nanowire arrays is presented. The formation of a Stern layer upon applying an electrochemical potential generated a complex optical response. Simulation of a lossy atomic layer on the nanowire array using the Multiple Multipole Program (MMP) corresponded very well to the experimentally observed peak position, intensity, and radius of curvature changes. Additionally, a significant voltage-dependent change in the resistance of the gold nanowire array was observed during the controlled formation of the electrical double layer. The results demonstrated that an applied electrochemical potential induces measurable changes in the optical and electrical properties of the gold nanowire surface. This is the first demonstration of combined plasmonic and nanowire resistance-based sensing of a surface process in the literature.
本文提出了一种同时进行的表面等离子体激元共振（LSPR）和电子传感，用于检测金纳米线阵列上潜在诱导离子吸附。当施加电化学势时，形成斯特恩层会产生复杂的光学响应。使用多重多极程序（MMP）对纳米线阵列上的损耗原子层进行模拟，与实验观察到的峰值位置、强度和曲率半径变化非常吻合。此外，在控制双电层形成过程中，还观察到金纳米线阵列的电阻显著的电压依赖性变化。结果表明，施加电化学势会引起金纳米线表面的光学和电学性质的可测量变化。这是文献中首次报道的结合等离子体激元和基于纳米线电阻的传感表面过程的应用。
