Raman spectra of patterned regions. (a, b) Two different spectral zones of the same sample patterned with a thicker carbonaceous layer (approximately 50 nm) while (c) spectra, bearing a lower signal, has been collected on a 2-nm-thick layer. All spectra have been fitted with a linear combination of Gaussian and Lorentzian curves (c, f) to extrapolate the peak centers. (d) The G positions and the I(G)/I(D) values fall within the theoretical first stage of the amorphization trajectory. (e) Interdefect distance La is deducted from Tuinstra-Koenig relation, valid for thin surface layers of a graphite sample. For details, see the main text. (f) A proposed fit that indicates the components of the band around 1,600 cm−1.
Lorenzoni et al. Nanoscale Research Letters 2013 8:75 doi:10.1186/1556-276X-8-75