IMEC, Kapeldreef 75, Leuven, Belgium.
Nano Lett. 2013 Apr 10;13(4):1724-9. doi: 10.1021/nl4003188. Epub 2013 Mar 6.
The ionic properties of a metal-coated silicon nanopore were examined in a nanofluidic system. We observed a strong increase of the ionic noise upon laser light illumination. The effect appeared to be strongly mediated by the resonant excitation of surface plasmons in the nanopore as was demonstrated by means of ionic mapping of the plasmonic electromagnetic field. Evidence from both simulations and experiments ruled out plasmonic heating as the main source of the noise, and point toward photoinduced electrochemical catalysis at the semiconductor-electrolyte interface. This ionic mapping technique described is opening up new opportunities on noninvasive applications ranging from biosensing to energy conversion.
我们在纳米流系统中研究了金属涂覆硅纳米孔的离子特性。我们观察到激光光照会引起离子噪声的大幅增加。通过对等离子体电磁场所进行的离子绘图，证明这种效应似乎是由纳米孔中表面等离激元的共振激发强烈介导的。来自模拟和实验的证据均排除了等离子体加热作为噪声的主要来源，而是指向半导体-电解质界面处的光致电化学催化。所描述的这种离子绘图技术为从生物传感到能量转换等非侵入性应用开辟了新的机会。
