Growth of Carbon Nano-onions in the Open Air by Laser Resonant Excitation of Precursor Molecules N305

In this paper, a highly efficient method was developed for the growth of CNOs in open air by effectively coupling the laser energy into the combustion flames through the resonant excitation of C2H4 molecules. CNOs with concentric graphitic shells were obtained at the wavelength of 10.532 μm compared with those grown without laser. The CNO growth rate at the wavelength of 10.532 μm is 2.1 g/h. Laser scattering of the CNO particles during the synthetic process indicates the formation of the CNO particles is ascribed to the direct decomposition of the C2H4 molecules into solid carbons on surfaces of growing particles