The growth mechanism of carbon nanotubes from thermal cracking of acetylene over nickel catalyst supported on alumina

被引：78

作者：

Mo, YH ^{[1
]}

Kibria, AKMF ^{[1
]}

Nahm, KS ^{[1
]}

机构：

[1] Chonbuk Natl Univ, Sch Chem Engn & Technol, Chonju 561756, South Korea

来源：

SYNTHETIC METALS | 2001年 / 122卷 / 02期

关键词：

carbon nanotube; nickel tip; mass spectrum; growth mechanism;

D O I：

10.1016/S0379-6779(00)00565-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Carbon nanotubes (CNTs) were grown on Ni/Al2O3 catalyst by thermal cracking of C2H2/H-2(N-2) at 600 degreesC for 30 min with a gas flow rate of 10/100 seem. The Ni/Al2O3 catalyst was prepared by mechanically mixing fine Ni and alpha -Al2O3 powders. The growth of CNTs in C2H2/H-2 medium is higher than that in C2H2/N-2 medium. The grown CNTs is a mixture of single-wall carbon nanotubes (SWNTs) and multi-wall carbon nanotubes (MWNTs). The gas-phase reaction was studied by analyzing gas species generated from the cracked C2H2/H-2 (N-2) media during the CNTs growth. C2H2 is not decomposed in gas-phase even at the growth temperature 600 degreesC, but is catalytically dissociated on the Ni surface to produce a reactive carbonic species. The growth mechanism of CNTs was intensively discussed in detail in this paper based on the experimental observations. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：443 / 447

页数：5

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