ScanningTunnelMicroscopy

2020-09-07 10:26  下载量:0

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Scanning Tunnel Microscopy (STM) is the earliest technique that was developed in the scanning probe microscopy (SPM) area. It generates imaging surfaces with atomic resolution, which is ~ 0.1 nm in lateral and ~ 0.01 nm in depth. The principle of the STM is based on quantum tunneling. When conducting measurements,a conducting sharp tip as the probe is brought very close to the surface. In the meantime, a voltage bias is applied between the tip and sample to make electrons tunnel through space. The resulting image is the change in the tip height as the tip is scanned over the sample surface. Clean sample surface and tip, and low electronic and physical noise are required for high-resolution STM imaging. The STM can be widely used in UHV or any other gas or liquid ambients from the temperature of ~ 0K up to 1300K.

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