Nanodiamonds by laser filamentation in ethanol

An infrared ultrafast laser (=1026 nm, ~160 fs) was used to synthesize nanodiamonds (ND) directly from an intense plasma in liquid ethanol (sans target) through the process of laser filamentation. The ethanol solution was characterized by its UV-VIS absorbance and optical emission spectra; and the nanodiamond particles by Raman spectroscopy and transmission electron microscopy (TEM) analysis. The absorbance spectra showed a single strong peak in the UV while the visible emission spectra displayed two lines above a background continuum. Raman spectroscopy showed the existence of D and G peaks that confirmed the presence of nanodiamonds. TEM analysis showed the nanodiamond particles had a narrow 2-5 nm size range with no aggregation and had visible lattice fringes of 2.06 Å corresponding to the diamond (111) phase. Electron energy loss spectroscopy (EELS) also confirmed the existence of nanodiamonds by revealing a 35 eV edge in the low loss region and a sharp onset of the carbon K-edge at 290 eV.

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