Structure of Low Temperature Pyrolytic Carbon and its Structural Change with High Temperature Treatment
1984 Volume 1984 Issue 119 Pages 197-206
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1984 Volume 1984 Issue 119 Pages 197-206
Structure of low temperature pyrolytic carbons (LTPC) prepared from cis-1, 2-dichloroethylene at 700°C and900°C was investigated by several analytical techniques and high temperature treatment.The LTPC as deposited exhibited Moh's hardness of 8.5, and its structure was found to be quite amorphous by X-ray diffraction, laser Raman spectra, and transmission electron microscopy (TEM).
However a scanning electron microscopic observation on the cross section of LTPC treated by electrolytic etching and an optical microscopic observation under dossed nicoles clearly indicated the anisotropic structure in which basal planes were roughly parallel to the deposition surface.The heat treatment of LTPC at a temperature higher than 2250°C induced rapid graphitization, which caused the expansion and exfoliation in LTPC layer.
The rapid growth of graphite layer in this process is also observed by TEM and electron diffraction analysis. The LTPC heat-treated at 2500°Cexhibits 2.25g/cm3 in density and the X-ray parameters are 3.355 Å in d002 and above 1000 Å in Lc (002) .The TEM image of this sample was characterized by the large layer structure having moire pattern.From these results, it may be concluded that the LTPC deposited in the precursor of graphitizing carbon composed with very fine units.
(Study on the low temperature pyrolytic carbon.VII.)
