喷雾热解法制备高产率石墨/炭纳米纤维及其特征研究

摘要

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-0.52 mm, a flow rate of benzene solution of-5 mL/min, a reaction temperature of～750 ℃, and a flow rate of hydrogen, as carrier gas, of～1500 mL/min. The typical length and diameter were～60 um and -250 nm, 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 1.45 g per run.%基于石墨/炭纳米纤维(GNFs)的克量级(>1 g)制备及其特征表征,通过苯的喷雾热解制备了GNFs,并采用XRD,TEM及SEM对GNFs进行了表征.结果表明:高产率GNFs的最佳生长条件是:喷管内径～0.52mm,苯液流量～5 mL/min,反应温度～750℃,载气H2流量～1 500 mL/min.所制GNFs的典型长度和直径分别为～60um和～250 nm,大部分GNFs样品呈现螺圈/螺旋纤维状.喷雾热解生长模式中GNFs的产率为克量级(1.45 g)/产程.