Tungsten Needles Are Applied in Microscopy

Tungsten needles are made from the material with high melting, high density, good corrosion resistance and electrical conductivity. They can be used for several applications in microscopy. Specifically, the following are common applications: 

Atomic Force Microscope (AFM): An atomic force microscope is a high-resolution surface topography measurement instrument. In AFM, needles made of tungsten are used as probes or probes. They interact with the sample surface to acquire high-resolution topographical images and measure surface forces and properties.

Phonon Scanning Tunneling Microscope (STM): STM is an instrument used to study the structure and properties of the surface of materials. In STM, a tungsten needle is used as a scanning probe. They sense and measure the electronic properties of sample surfaces through quantum tunneling and produce high-resolution atomic-scale images.

Transmission Electron Microscope (TEM): A TEM is an instrument used to observe and analyze the internal structure and properties of materials. In TEM, W needles are often used to prepare ultrathin sections of samples. They are used to cut materials, obtaining nanoscale flakes for high-resolution imaging and analysis under a transmission electron microscope.

Scanning Electron Microscope (SEM): A SEM is an instrument widely used in the observation and analysis of surface topography. In SEM, a tungsten needle is used as the cathode of the electron gun. They generate high-energy electron beams that are used to excite electrons on the sample surface and generate microscopic images.

The specific application of tungsten needles in microscopes will vary according to different microscope types and experimental needs. Therefore, in practical applications, it is very important to choose the proper shapes, sizes and characteristics to ensure the best microscope performance and results.

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