Carbon nanoparticle appearing in perfect spherical shape, with sizes varying from tens nanometers to several micrometers, can be produced by pulsed-laser ablating different elementary carbon samples immersed in water....Carbon nanoparticle appearing in perfect spherical shape, with sizes varying from tens nanometers to several micrometers, can be produced by pulsed-laser ablating different elementary carbon samples immersed in water. A variety of samples including HOPG,graphite, arcdischarging deposite, glassy-carbon and imitation-diamond have been tried.The yield of the diamand nanospherulite is found to depend on the structure of the sample.The SAED pattern of the carbon-sphere produced from arc-discharging deposite can be at-tributed to the hexagonal structure of diamond, and its HREM image exihibits 0.38nm×0.31 nm lattice, which is just three times of the distances for (110) (d=0.126 nm) and (004) (d=0.1030nm) crystal layers of hexagonal diamond, respectively. While the SAED pattern from glassy-carbon sample displays a cubic-diamond structure. Furthermore, Raman spectra and 13C NMR indicate tetrahedral network of the spheres.展开更多
文摘Carbon nanoparticle appearing in perfect spherical shape, with sizes varying from tens nanometers to several micrometers, can be produced by pulsed-laser ablating different elementary carbon samples immersed in water. A variety of samples including HOPG,graphite, arcdischarging deposite, glassy-carbon and imitation-diamond have been tried.The yield of the diamand nanospherulite is found to depend on the structure of the sample.The SAED pattern of the carbon-sphere produced from arc-discharging deposite can be at-tributed to the hexagonal structure of diamond, and its HREM image exihibits 0.38nm×0.31 nm lattice, which is just three times of the distances for (110) (d=0.126 nm) and (004) (d=0.1030nm) crystal layers of hexagonal diamond, respectively. While the SAED pattern from glassy-carbon sample displays a cubic-diamond structure. Furthermore, Raman spectra and 13C NMR indicate tetrahedral network of the spheres.