Full-graphitization of pitch-based carbon using microwaves with metal chloride impregnation


Teawon Kim;Kun-Hong Lee;


With the emerging of graphitic materials including graphemeand carbon nanotubes, understanding the graphitization phenomena becomes very important. In this work, full-graphitization of amorphous carbon was tried using microwaves. Pitch-based carbon powder (THFS) was graphitized by microwave irradiation with metal chloride impregnation. Without impregnation, d 002 of THFS decreased from 3.4716 to 3.4299 after microwave irradiation (2.45 GHz, 1500W, 30min). Further graphitization was achieved by adding nickel chloride into THFS followed by the same microwave irradiation. 1, 3, and 5 mmol of nickel chloride (NiCl2 ) impregnated THFS showed peak shift, shoulder-like transform, and peak separation respectively after microwave irradiation. 6 mmol NiCl 2 impregnated THFS shows 3.3860 of d 002 which is similar to the value of the THFS after conventional heat treatment (2600 °C, 1h). After microwave irradiation, the intensity ratio between G-band and D-band (IG/ID ratio) increased about 8 times from 1 to 7.9. The degree of graphitization was also confirmed by TEM analysis. The role of NiCl 2 was not simple catalyst as in the conventional graphitization process because CoCl2 and FeCl2 made totally different results. This is the first report of full-graphitization by microwaves and has potential to replace conventional heating to microwave heating in the field of extremely high temperature processing.


Microwave, Graphitization, Carbon Nanotube


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