Method and device for improving crystallinity through field emission self-heating inducing nanometer structure

The invention discloses a method for improving crystallinity through field an emission self-heating inducing nanometer structure. A nanometer structure material is heated in situ through joule heat generated by field emission current, the temperature of the nanometer structure material rapidly rises through the field emission current generation process, recrystallization of the polycrystalline nanometer structure under the micro-scale is promoted, and crystallinity of the nanometer structure material is improved. The technology is simple in achievement method, crystallinity of metal, semiconductors and other nanometer materials can be improved without providing external heat energy, and by improving crystallinity of the material structure, the physical characteristics such as material electricity and field emission can be improved. The invention further provides a field emission device for achieving the aspects.