温度对CVD法制备多壁碳纳米管的影响

Temperature effect on the preparation of MWNTs using thermal chemical vapor deposition

以Fe/SiO2粉状物作催化剂用化学沉积法裂解乙炔制备出无序多壁碳纳米管,用TEM、XRD和DSCTGA分析了反应温度对碳纳米管的影响。实验结果表明,反应温度分别为600、700和800℃时,制备出碳纳米管的直径相应为12～20、15～25和33～66nm,即碳纳米管的直径随着反应温度的升高而增大。同时随着反应温度的提高碳纳米管的石墨化程度也有明显的提高。因此碳纳米管的直径、石墨化程度等结构特性可以用反应温度来加以控制。

Multi-walled nanotubes (MWNTs) were achieved by using a method based on chemical vapor deposition catalyzed by iron nanoparticles embedded in mesoporous silica. The influence of reaction temperature on their structure has been studied by TEM, XRD and DSC-TGA. Experiment results show that, the diameter of MWNTs were in the range 12-20, 15-25 and 33-66 nm, respectively at 600, 700 and 800°C, that was, the average diameter increases with the reaction temperature. The TEM images, DSC-TGA data, and XRD spectra reveal consistently that the degree of crystalline perfection increases progressively as the increases. This result demonstrates that the diameter and crystalline of MWNT can been controlled with the reaction temperature.