Raman spectroscopic study on pyrolyzed wood and bark of Japanese cedar: Temperature dependence of Raman parameters

Abstract

Raman spectra were measured for Japanese cedar wood and bark pyrolyzed in a nitrogen atmosphere at various temperatures (200°-1100°C). Two characteristic bands, near 1340 and 1590 cm-1, denoted as the D-band and G-band due to graphitic carbon, respectively, appeared on all the spectra; and the spectral features changed markedly with increasing heat-treatment temperature (HTT). The Raman parameters (band position, band width, D/G ratio) of the bands were deconvolved using of a curve-fitting method. There was no significant difference in the values of the parameters between the wood and bark. The D-band position and the G-band width showed a marked HTT dependence in the region of 400°-800°C. We described the correlations of the Raman parameters with HTT and investigated the availability of Raman spectroscopy as a means for evaluating HTT.