Raman and photoluminescence study of magnetron sputtered amorphous carbon films

Diamond and Diamond-Like Carbon from a Preceramic Polymer

“…A Raman spectrum at the IR irradiation wavelength of 1064 nm is shown in Figure a. The resonance of the substrate is seen at 521 cm - , and a broad and intense band, characteristic of silicon carbide, appears at 760 cm - . , The broad feature between 900 and 1400 cm - at this irradiation wavelength is a possible indicator of sp 2 carbon . However, both Si and SiC have Raman bands in this region, at 950−1050 cm - and 973 cm - , respectively, which contribute to this feature. , This Raman irradiation wavelength selectively detects sp 2 structure over sp 3 and can detect even small amounts of amorphous carbon in well-crystallized diamond films. , However, the spectrum of the diamond-like carbon film displays no resonances at all between 1500 and 1700 cm - (the G band region; see inset, Figure a), the frequency regions for CC stretching of graphitic carbon and of isolated carbon−carbon double bonds, respectively …”

Structure evolution of fluorinated diamond-like carbon films prepared at varying source gas flow ratios

“…But the D mode is the breathing mode of those sp 2 sites only in rings. The intensity ratio of the D and G mode I D /I G decreases with the number of rings per cluster falls or the fraction of chain groups rises [2,10]. For the F-DLC films, the decrease of I D /I G may help produce more C@C bond (or aromatic rings) being terminated by fluorine atoms and forming more chain-like structure of olefinic compounds (sp 3 sites).…”

Structural and optical characterization of pyrolytic carbon derived from novolac resin

“…4. The Raman spectra of graphitic carbons consist, generally, of two bands, the graphitic G-band at 1575 cm -1 and the disordered graphitic D-band at 1355 cm -1 assigned to phonons of E 2g and A 1g symmetry, respectively [5,7]. An intensive PL-band is superimposed on the Raman spectra of composite materials pyrolyzed in the range of 400-600°C, as shown in Fig.…”

“…Ordering effects and the formation of graphitic layers at higher temperatures can be investigated by XRD analysis [1,2,3] and complementary FTIR-and Ramanspectroscopic techniques [3,4]. In addition, changes in defect concentration can be monitored effectively by PL spectroscopy [5]. In the present work, XRD, FTIR, Raman, and PL spectroscopy are used to study the effect of pyrolysis temperature on pyrolytic carbons derived from cured novolac resin and cured novolac/biomass composites.…”