炸药爆轰法制备的纳米石墨粉的拉曼光谱

负氧平衡炸药爆轰法合成的纳米石墨粉，是一种新型的具有良好实用前景的纳米粉体材料。采用负氧平衡炸药梯恩梯(TNT)，在分别充有氮气、氩气、二氧化碳等保护性气体、压力为0．25～2atm的密闭容器内爆轰制备了纳米石墨粉。用激光拉曼光谱对制备的样品进行了测试，结果表明样品为石墨结构。纳米石墨粉的Raman峰与块体石墨相比，其峰位向高波数方向偏移了约5cm^-1。纳米石墨粉Raman峰的半高宽约为22cm^-1,由此可计算出纳米石墨粉的颗粒大小为2．97～3．97nm。与高纯石墨Raman峰相比，纳米石墨粉的Raman峰由于尺寸效应出现了蓝移现象，并对此现象进行了讨论。用X射线衍射仪(XRD)和透射电子显微镜(TEM)测定了纳米石墨粉的物相，并对其颗粒粒径进行了估算，其结果为2．58nm(酸处理前)和1．86nm(酸处理后)，与Raman光谱的结果基本吻合。

Raman Spectrum of Nano-Graphite Synthesized by Explosive Detonation

The nano-graphite powder synthesized by the detonation of explosives with negative oxygen balance is a new powder ~material with potential applications. In this work, the preparation of nano-graphite powder in steel chamber by pure TNT ~(trinitrotoluene) explosives has been introduced. In the synthesis process, the protective gases in the steel chamber are N_2, CO_2 and Ar, and the pressure is 0.25-2 atm. Raman spectrum of the nano-graphite was measured. The characteristic Raman band assigned to sp2 of graphite has been observed at about 1 585 cm~-1 with half-peak width of 22 cm~-1 . The peak shifted to a higher frequency by 5 cm~-1 compared with that of bulk graphite. The authors explain this blue shift phenomenon by size effect. The average size of nano-graphite from Raman measurement is 2.97-3.97 nm. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to ~measure the structure and particle size of the nano-graphite. The crystallite size of nano-graphite estimated from XRD and TEM are 2.58 nm(acid untreated) and 1.86 nm(acid treated) respectively, which is in accord with the results of the measurement approximately.