Tungsten needles can be used in electron microscopy. In fact, tungsten is a popular material for making electron microscope filaments, which are used to produce a beam of electrons for imaging samples. The high melting point and low vapor pressure of tungsten make it an ideal material for this application, as it can withstand the high temperatures and high vacuum conditions required for electron microscopy. Tungsten needles can also be used for sample preparation in electron microscopy, such as cutting and sectioning samples for imaging.
