喷雾热解法制备高产率石墨／炭纳米纤维及其特征研究

High yield synthesis and characterization of graphitic carbon nanofibers by spray pyrolysis

基于石墨／炭纳米纤维（GNFs）的克量级（〉1g）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～5mL／min，反应温度-750℃，载气H2流量-1500mL／min。所制GNFs的典型长度和直径分别为～60μm和-250nm，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（1．45g）／产程。

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 - 1 500 mL/min. The typical length and diameter were -60 μm 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.