Nano tungsten needle is often used as a STM probe. And Most of the STM probes are nano tungsten needles. Wherein, nano tungsten needle is made of high-purity tungsten wire with good electrical conductivity and mechanical strength. According to the experts, STM (Scanning Tunneling Microscope) is different from XRD (X-Ray Diffraction), LEED (Low Energy Electron Diffraction) and other reciprocal space imaging using diffraction methods. STM can directly image the conductive sample in real space with atomic resolution, and has achieved remarkable results in observing the arrangement of atoms on the surface of matter and understanding the electronic structure.
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The premise of obtaining high-quality imaging is ultra-high spatial resolution. According to the STM imaging theory, the size of the tip of the nano tungsten needle (i.e., the radius of curvature) directly determines the resolution of the STM. Therefore, to obtain high resolution, it is necessary to use a sharper needle for imaging. Therefore, since STM was developed, the continuous improvement of imaging resolution has been the goal pursued in this field.
