阿托安培纳米电化学
Attoampere Nanoelectrochemistry
摘要：
纳米尺度的局部电化学测量和成像对于分子器件、传感器、材料工程、电生理学和从人工光合作用到电池的各种能源应用的未来发展至关重要。实现单分子灵敏度的最终步骤需要测量aA电流，这比当前最先进的测量能力低三个数量级。在这里，我们展示了亚aA水平和<80 nm空间分辨率的电化学测量，我们通过利用GHz显微镜对局部法拉第界面电容的超高灵敏度来实现。我们证明了这一点，一个众所周知的表面结合的二茂铁烷基单层，一个系统，不能在纳米级研究，除非使用大型nanoarrays 11。我们报告的同时测量的本地循环伏安图（CV），提供原子的信息，各自的电子转移反应，并揭示了两个分子的配置具有类似的氧化还原能势-见解无法通过电化学系综测量。
英文摘要：
Local electrochemical measurements and imaging at the nanoscale are crucial for the future development of molecular devices, sensors, materials engineering, electrophysiology and various energy applications from artificial photosynthesis to batteries. The ultimate step towards single-molecule sensitivity requires the measurement of aA currents, which is three orders of magnitude below that of current state-of-the-art measurement abilities. Here, we show electrochemical measurements at the sub aA level and <80 nm spatial resolution, that we reach by exploiting the ultra-high sensitivity of our GHz microscope for local faradaic interface capacitances. We demonstrate this for a well-known surface-bound ferrocene alkyl monolayer, a system that cannot be studied at the nanoscale unless large nanoarrays are used11. We report the simultaneous measurement of local cyclic voltammograms (CV) which provide atomistic information on the respective electron transfer reaction and reveal two molecular configurations with a similar redox energy potential -- insights inaccessible by electrochemical ensemble measurements.
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