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Laser pyrolysis of hydrocarbons leads to soots containing different carbon nanostructures. The investigations of carbon nanopowders revealed the presence of the amorphous carbon, carbon with small graphitic sheets or fullerene-like structures. The soot morphology depends on the gas mixture and experimental parameters. The role of oxygen is essential in obtaining soot particles having considerable...
Carbon nanopowders were obtained by the laser pyrolysis of ethylene. The high-temperature gradients and very rapid reaction times characteristic of the process lead to the formation of very fine powders. Carbon powders obtained in runs with different laser power values (400-900 W), pressures (250-950 mbar), and gas flows (100-300 sccm) were characterised by transmission electron microscopy (TEM),...
We describe the possibility to synthesize carbon nitride fine powder by laser pyrolysis of acetylene/nitrous oxide/ammonia mixtures. The powders were produced in a flow reactor by varying the relative concentrations of the sensitizers ( SF6 C2H4). The kinetics of the reaction was monitored by IR spectrophotometry of the exhaust gases. The powder crystallinity and bond structure was studied by X-ray...
The carbon nitride (CN x ) films have been prepared by infrared (IR; at 10.6 μm) and ultraviolet (at 248 nm) laser induced chemical vapour deposition (CVD) using different ethylene/nitrous oxide/ammonia mixtures. The partial concentration of ammonia in mixtures was varied in order to obtain a higher nitrogen incorporation in the deposited films. The changes induced in the gas-phase composition...
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