一种制备巴基葱的新方法──纳米碳化硅高温真空热分解法

A NEW WAY OF MAKING BUCKY ONION BY THERMAL DECOMPOSITION OF SiC NANOMETER POWDERS UNDER HIGH TEMPERATURE AND VACUUM

实验发现，通过真空热处理碳化硅纳米粉末可以获得巴基葱．透射电子显微镜和高分辨电子显微镜观测表明，当碳化硅完全分解时，形成空心准球状颗粒和葱状石墨颗粒；当碳化硅分解不完全时，形成碳包裹碳化硅结构，该包裹层由准同心石墨壳层构成．由实验结果知。

Abstract ? Bucky onions have been produced by decomposing SiC nanometer powders under high temperature and vacuum. Transmission electron microscope and high resolution electron microscope observations show that when SiC particles decompose completely, they transform into quasi spherical hollow carbon particles and onion like particles composed of concentric graphitic shells. When SiC particles decompose incompletely, they become compound particles, which are composed of β SiC in particles and of quasi concentric graphitic shells on surface of particles. The results suggest that the traditional idea that planar graphite is the most stable form of pure carbon would then have to be seriously discussed. 