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采用沉淀方法制备了直径分布狭窄的均匀Fe3O4纳米颗粒。Fe3O4纳粒形体几近一致,平均粒径为10.33nm±2.99nm(平均粒径±标准偏差)。在超声作用下将MgO纳米颗粒分散在一定量Fe3O4纳米颗粒的水溶液中获得MgO负载Fe3O4的纳米颗粒。以甲烷为碳源,Fe3O4/MgO为催化剂,经化学气相沉积,在Fe3O4纳粒上制得了大量直径近乎均匀的单壁碳纳米管(SWCNTs)束。TEM显示:SWCNTs的平均直径1.22nm。热重分析显示:样品在400℃～600℃温度区间失重量约19%。拉曼光谱显示:SWCNTs的ID/IG的强度比为0.03,表明采用Fe3O4/MgO催化剂可制得高石墨化程度的单壁碳纳米管。
The uniform diameter distribution of Fe3O4nanoparticles was prepared by precipitation method. The Fe3O4 nanoparticles were almost the same with an average particle size of 10.33 nm ± 2.99 nm (mean particle size ± standard deviation). Under the action of ultrasound, the MgO nanoparticles are dispersed in an aqueous solution of a certain amount of Fe3O4 nanoparticles to obtain MgO nanoparticles loaded with Fe3O4. Using methane as carbon source and Fe3O4 / MgO as catalyst, a large number of SWCNTs bundles were prepared on Fe3O4 nanoparticles by chemical vapor deposition. TEM shows that the average diameter of SWCNTs is 1.22 nm. Thermogravimetric analysis showed that the weight loss of the sample in the temperature range of 400 ℃ ~ 600 ℃ was about 19%. Raman spectroscopy showed that the intensity ratio of ID / IG of SWCNTs was 0.03, indicating that single-walled carbon nanotubes with high degree of graphitization can be obtained by using Fe3O4 / MgO catalyst.