Multipeak fitting analysis of Raman spectra on DLCH film

Abstract

The hydrogenated diamond-like carbon (DLCH) film with 1-µm thickness is deposited by direct hydrocarbon gas ion beam method on silicon wafer and annealed at 400 • C. Detailed Raman spectra feature are fitted from nine sets of different peak fitting functions, including Gaussian, Lorentzian and Breit-Wigner-Fano (BWF) functions. These fitting results obtained from a two-peak combination show some specific variances on the G peak position, FWHM G and I D /I G ratio for as-deposited and as-annealed DLCH films. The most popular two-peak fitting method with full Gaussian function tends to exhibit a higher ratio of the G peak position shift and higher I D /I G ratio than others fitting methods, the drastic difference among the most popular G (G) & G (D) and B (G) & L (D) schemes also have brought out in I D /I G ratio. However, for a more complex four-peak Gaussian function fitting Raman spectra, the I D /I G ratio is close to that of a two-peak fitting function with a mixture functions of BWF (G) and L (D). Furthermore, a series of systematic peak fitting procedures and comparisons of Raman spectra have been discussed in this study.

Fructose and Urea as Precursors for N‐/O‐Modified Mesoporous Carbon with Enhanced Sorption Capacity for Heavy Metal Ions

“…For the N‐/O‐containing sample (prepared from fructose/urea), the value is 4.8. Quantitatively different intensity ratios of 3.1 and 3.9 were obtained when Lorentzian instead of Gaussian profiles were used (not shown);52 however, this results in poorer fit accuracy. Hence, the N‐/O‐containing sample shows a clearly lower degree of graphitization.…”

Effect of Pt and Fe catalysts in the transformation of carbon black into carbon nanotubes

“…Spectra were obtained for 2 Â 10 s over a range of 150-4000 cm À 1 on a Peltiercooled ( À 70°C) 1024 Â 256 pixel CCD array detector. Raman peak characteristics were obtained by peak de-convolution using a Gauss-Lorentzian function with 100 iterations per fit, with the program Labspec version 5.58.25 [34,35].…”

Physicochemical and Biological Investigation of Different Structures of Carbon Coatings Deposited onto Polyurethane

“…Surface functionalization was determined by X-ray photoelectron spectroscopy R3000 (VG Scienta, Sweden) system equipped with monochromatic Al (Kα1,2 = 1486.6 eV) X-ray source. The calibrations of peak position were done in accordance to C1s peak energy established at 284.6 eV (Tai et al 2009;Wang et al 2009). The C1s core level spectra were obtained at pass energy of 25 eV.…”