摘要
在浮动催化化学气相沉积(FCCVD)法制备碳纳米管连续体的工艺中,一般采用碳源加二茂铁在氢气作用下催化生长碳纳米管连续体。整个工艺过程中需要外部供给大量的氢气,既需要消耗高品质氢能源,又会有较高的安全风险。根据甲醇高温裂解产生氢气的原理,由于甲醇可以在高温下分解生成氢气,本研究将甲醇添加到碳源中,以替代FCCVD工艺中的氢气。实验发现:随着甲醇与乙醇体积比的增加,形成碳纳米管连续体的过程中所需氢气量明显减少;当甲醇与乙醇体积比为6∶1时,能够在纯惰性气体氛围中稳定、连续地制备碳纳米管连续体。对得到的碳纳米管连续体采用532 nm激光拉曼进行表征,其I_(G)/I_(D)值为3.24,表明碳纳米管结晶性良好。连续体经过水收集形成碳纳米管纤维,SEM表征显示纤维中的碳纳米管具有一定的取向性,力学拉伸测试其拉伸强度为330 MPa。同时经计算发现:在达到相同效果的前提下,使用甲醇的效率是纯氢气的2.48倍。因此本工作提供了一种节能、安全的碳纳米管连续制备方法。
Carbon sources and ferrocene are generally adopted in the presence of hydrogen for the successive synthesis of carbon nanotube fibers(CNFs)via floating catalytic chemical vapor deposition(FCCVD)process.This method requires a large amount of external hydrogen supply,which not only consumes valuable hydrogen energy,but also leads to high safety risks.As it can produce hydrogen by methanol decomposition at high temperature,in this studly methanol is added into carbon sources aiming for the substitution of hydrogen adoption in FCCVD process.It is found that,with the methanol/ethanol mixture as the carbon sources,CNFs can be produced successively in inert argon atmosphere when the volume ratio of methanol to ethanol is 6∶1.The I_(G)/I_(D) of the 532 nm Raman spectrum of the CNFs is 3.24,which confirms the good crystallinity of the composed CNTs.SEM result indicates that CNTs have preferential orientation in the fibers,thus leading to a high strength of 330 MPa.Furthermore,on the premise of the same effect,the efficiency of using methanol is 2.48 times of that of pure hydrogen.Thus this work provides an economical and safe method for the mass production of CNFs.
作者
邱昀淙
宋远强
李亚利
QIU Yuncong;SONG Yuanqiang;LI Yali(School of Materials Science and Engineering,Changzhou University,Changzhou 213000,Jiangsu,China;Institute of Flexible Electronics Technology of Tsinghua,Jiaxing 314000,Zhejiang,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2022年第8期76-82,共7页
Materials Reports
关键词
甲醇
碳纳米管纤维
惰性气氛
浮动催化化学气相沉积
替代效率
methanol
carbon nanotube fibers
inert atmosphere
floating catalytic chemical vapor deposition
substitution efficiency
