Fig. 4

Raman spectra of the 2–5-nm nanodiamond mixed with Si (the bottom spectrum) and created after high-power irradiation sp² clusters (the middle spectrum). The upper spectrum appropriates to the bottom spectrum with the intensity multiplied by the factor of 50. Bands related to Si (the first and the second orders) and SiC (around 790 cm⁻¹) are marked. The spectra were acquired at the same 0.7 mW laser beam power. Excitation wavelength was 532 nm