Method for preparing millimeter-sized spamorphous carbon block material

Abstract

The invention relates to a millimeter-sized bulk spa amorphous carbon material and a method of preparing the same, and the method comprises a step of performing a high-temperature and high-pressure (HTHP) treatment on Cpowder at a temperature of 450-1100° C., preferably 700-1000° C., more preferably 900-1000° C., and most preferably 1000° C., and a pressure of 20-37 GPa, preferably 20-30 GPa, and most preferably 27 GPa, so as to obtain the millimeter-sized bulk spamorphous carbon material. The spcarbon content in the amorphous carbon material is adjustable by changing the temperature and pressure conditions, so that the spcontent is greater than 80%, and the spcontent of high-quality samples is close to 100%. The optical band gap and thermal conductivity of the series of amorphous carbon materials can be effectively adjusted. The obtained series of amorphous carbon materials have ultra-high hardnesses, high thermal conductivities, adjustable band gaps (1.90-2.79 eV) which exceed the ranges of the band gaps of amorphous silicon and germanium. As a result, a new space is opened up for the application of amorphous materials.