Evidence for Faradaic Processes in Scanning Probe Microscopy on Mica in Humid Air
Evidence for Faradaic Processes in Scanning Probe Microscopy on Mica in Humid Air
复制标题
潮湿空气中云母扫描探针显微镜法拉第过程的证据
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
A. Bard
中科院分区：
文献类型：
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作者：
Fardad Forouzan;A. Bard
利用扫描隧道显微镜（STM）在潮湿空气中实现了银纳米结构在绝缘原子级平坦云母表面上的高分辨率电化学沉积。电流是法拉第的，并且通过云母表面上的薄水层在尖端和云母基板上的表面接触之间流动。水层的厚度和电导率决定了法拉第电流的大小。使用改进的低电流STM和传统的钨STM尖端进行银沉积。将尖端保持在-1.2至-1.4 V的负偏压下（尖端对基底），设定点电流为1 - 1.7 pA。纳米结构的尺寸和形状由针尖扫描速率控制，并被限制在针尖下的扫描区域。
High-resolution electrochemical deposition of silver nanostructures on insulating atomically flat mica surfaces in humid air was achieved with a scanning tunneling microscope (STM) operating in a scanning electrochemical microscopy mode. The current is faradaic and flows between the tip and a surface contact on the mica substrate through a thin water layer on the mica surface. The thickness and conductivity of the water layer governs the magnitude of the faradaic current. Modified low current STM and conventional tungsten STM tips were used for the silver deposition. The tip was held at a negative bias of -1.2 to -1.4 V (tip vs substrate), with setpoint currents of 1 -1.7 pA. The sizes and shapes of the nanostructures were controlled by the tip scan rates and were restricted to the scan areas under the tip.