厦门大学最近运用化学催化合成法，研制出１种外径１５～２５ｎｍ、内径约３ｎｍ的多壁碳纳米管，并建立了纯化分离方法，单程产率由原来的０．１ｇ增加到１０ｇ。最初发现的碳纳米管由碳电弧法生产，该法所制得的碳纳米管管直、结晶度高，但产率低，分离纯化困难。稍后开发了 Recently, Xiamen University used chemical catalytic synthesis to develop a multi-walled carbon nanotube with an outer diameter of 15-25 nm and an inner diameter of about 3 nm, and established a purification and separation method. The yield per pass increased from 0.1 g to 10 g. The initially discovered carbon nanotubes were produced by the carbon arc method. The carbon nanotubes obtained by the method were straight and high in crystallinity, but their yield was low and separation and purification were difficult. Developed later