碳纳米物质的直接激光飞行时间质谱分析

用含金属氧化物的石墨棒作电极 ,在氩气氛中利用弧放电制备碳纳米类物质。用于分析测定的物质是碳纳米类物质 C6 0 、C70 、C76 、C78、C84 以及 La@C82 ,得到其在正离子状态下的分子离子及碎片离子。碳纳米类分子以 C2 -碎片丢失的方式进行特征解离。对不同碳纳米物质的系列碎片峰的强度进行研究结果表明 :碎片M-C2 n H]+丰度随球形分子的体积的增大而增加 ,而且碎片 M-C2 n H]+的丰度略大于 M-C2 n]+。激光飞行时间质谱分析为碳纳米分子结构及其稳定性提供了十分有用的信息

Analysis of Carbon Nano-Network Materials by Direct Laser Time of Flight Mass Spectrometry

The carbon nano-network material is synthesized by the arc discharge of the electrode, which is made of the graphite and metal oxide and placed in the argon atmosphere. The carbon nano-network materials, C 60, C 70, C 76, C 78, C 84 and C 82@La are used as analyzed materials. A series of fragment mass peaks corresponding to the C 2n-loss (n=1,2,3......) of fullerene and metallofullerene molecules are observed in positive mode. The intensities of the fragment ions are found to increase regularly with the increasing size of the carbon cage. Furthermore, intensities for M-C 2nH] + ions are found to be higher than those for + in all samples. The results provide us with useful information about the cage structure and stability of carbon nano-network materials.