Method for preparing diamond from graphite by inner shell electron excitation

摘要

If a stable graphite structure is reversed to a stable diamond structure using some excited state established at normal temperature and pressure, graphite can easily be transformed into diamond. If this technique is realized, it is expected to be applied to nanotechnology, short-wavelength, high-power semiconductor lasers, and high-power electronics. A method for producing diamond includes the step of exposing single-crystal or polycrystalline graphite having an sp² structure to one selected from the group consisting of synchrotron radiation X-rays, radiation, laser light, an electron beam, and accelerated multicharged ions under normal pressure to excite the is inner-shell electrons of carbon atoms (C) constituting the graphite, thereby producing diamond having an sp³ structure from the graphite having the sp² structure. The method inexpensively produces single-crystal diamond, polycrystalline diamond, or nanostructural diamond in a large amount.