Optical properties of carbon materials formed by pyrolysis of novolac-resin/biomass composites

Theodoropoulou, S; Papadimitriou, D; Zoumpoulakis, L; Simitzis, J

dc.contributor.author	Theodoropoulou, S	en
dc.contributor.author	Papadimitriou, D	en
dc.contributor.author	Zoumpoulakis, L	en
dc.contributor.author	Simitzis, J	en
dc.date.accessioned	2014-03-01T01:21:11Z
dc.date.available	2014-03-01T01:21:11Z
dc.date.issued	2004	en
dc.identifier.issn	0925-9635	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16120
dc.subject	Agricultural by-products	en
dc.subject	Photoluminescence	en
dc.subject	Photoreflectance	en
dc.subject	Raman	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Biomass	en
dc.subject.other	Fourier transform infrared spectroscopy	en
dc.subject.other	Optical properties	en
dc.subject.other	Photoluminescence	en
dc.subject.other	Pyrolysis	en
dc.subject.other	Raman scattering	en
dc.subject.other	Resins	en
dc.subject.other	Photoreflectance spectroscopy	en
dc.subject.other	Pyrolysis temperature	en
dc.subject.other	Activated carbon	en
dc.subject.other	diamond	en
dc.title	Optical properties of carbon materials formed by pyrolysis of novolac-resin/biomass composites	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.diamond.2003.11.057	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.diamond.2003.11.057	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	The optical properties of carbon materials formed by pyrolysis of novolac-resin/biomass composites were studied by Raman, photoluminescence (PL) and (modulated) photoreflectance (PR) spectroscopy in dependence of the pyrolysis temperature and the heating rate. In the Raman spectra, the frequency, width and intensity ratio of the disordered graphitic D-band to the graphitic G-band, I-D/I-G, indicate an increase in ordered sp(2)-bonds in composites pyrolyzed at 1000 degreesC in comparison with those at lower pyrolysis temperatures. Moreover, the intense PL, observed at 2.2 eV for pyrolysis temperatures in the range 400-600 degreesC, is significantly decreased at temperatures greater than or equal to 800 degreesC, which implies that the materials pyrolyzed at higher temperatures have less defects. According to the results of Raman-studies and complementary FIFIR-studies, the material pyrolyzed at 1000 degreesC exhibits spectral characteristics similar to those of activated charcoal. A weak PR-band observed at 2 eV in the spectra of activated charcoal gives an indication of the (optical) band gap of charcoal and related composite materials. Materials pyrolyzed at high temperatures (greater than or equal to1000 degreesC) are expected to be suitable for electrochemical applications. (C) 2003 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	Diamond and Related Materials	en
dc.identifier.doi	10.1016/j.diamond.2003.11.057	en
dc.identifier.isi	ISI:000220043200029	en
dc.identifier.volume	13	en
dc.identifier.issue	2	en
dc.identifier.spage	371	en
dc.identifier.epage	375	en