铁-钴相互作用对多壁碳纳米管生长的影响。

Effects of the Fe-Co interaction on the growth of multiwall carbon nanotubes.

作者信息

Li Zhongrui, Dervishi Enkeleda, Xu Yang, Ma Xiaodong, Saini Viney, Biris Alexandru S, Little Reginald, Biris Alexandru R, Lupu Dan

机构信息

Nanotechnology Center and Graduate Institute of Technology, University of Arkansas at Little Rock, Arkansas 72204, USA.

出版信息

J Chem Phys. 2008 Aug 21;129(7):074712. doi: 10.1063/1.2971180.

DOI:10.1063/1.2971180

PMID:19044797

Abstract

The influences of active species Fe-Co composition on the growth of carbon nanotubes (CNTs) were systemically investigated. CNTs were grown from the pyrolytic decomposition of C(2)H(2) over Fe-Co/CaCO(3) catalysts by radio frequency chemical vapor deposition (CVD). The catalyst stoichiometry was found to strongly influence the carbon deposition rate as well as the nanotube crystallinity characteristics. Compared to the CNTs synthesized over the Co/CaCO(3) catalyst, those produced by Fe-containing catalysts have less amorphous carbon. The maximum yield of high-quality CNTs was achieved at the Fe/Co atomic ratio of 2:1 due to a suitable concentration of benzene generated from acetylene CVD on such catalytic system. Fe and Co can form alloy and therefore the d-electron interaction between Fe and Co was believed to play an important role in the CNT growth.

摘要

系统研究了活性物种铁钴组成对碳纳米管（CNT）生长的影响。通过射频化学气相沉积（CVD），在Fe-Co/CaCO₃催化剂上，由C₂H₂的热解分解生长出碳纳米管。发现催化剂化学计量比强烈影响碳沉积速率以及纳米管的结晶度特征。与在Co/CaCO₃催化剂上合成的碳纳米管相比，含铁催化剂制备的碳纳米管具有较少的无定形碳。由于在这种催化体系上乙炔CVD产生的苯浓度合适，在Fe/Co原子比为2:1时实现了高质量碳纳米管的最大产量。铁和钴可以形成合金，因此认为铁和钴之间的d电子相互作用在碳纳米管生长中起重要作用。