喷雾热解法制备高产率石墨/炭纳米纤维及其特征研究

Gramscale (>1g) synthesis and characterization of graphitic/carbon nanofibers (GNFs) is described. The GNFs were grown by the spray pyrolysis of benzene and characterized by Xray diffraction and transmission/scanning electron microscopy. The optimum growth conditions for a high yield of GNFs were found to be a spray nozzle diameter (inner diameter) of ~0.52mm, a flow rate of benzene solution of ~5mL/min, a reaction temperature of ~750℃, and a flow rate of hydrogen, as carrier gas, of ~1500mL/min. The typical length and diameter were ~60μm and ~250nm, respectively. Most of the GNFs exhibited coiled/helicallike fibers. The yield of GNFs in the spray pyrolysis growth mode was found to be of the order of 1.45g per run.