Open AccessStudy the multiwalled nanotubes growth mechanism overFe/Ni/Al2O3 from acetylene source
Author(s) -
Nghia Q. Nguyen,
Vinh Duy Cao,
Anh Tuan Luu,
Vinh-Dat Vuong,
Thanh Van Le
Publication year - 2013
Publication title -
khoa học công nghệ
Language(s) - English
Resource type - Journals
ISSN - 1859-0128
DOI - 10.32508/stdj.v16i4.1604
Subject(s) - acetylene , crystallization , materials science , pyrolysis , chemical engineering , chemical vapor deposition , argon , tube furnace , tube (container) , atmospheric temperature range , nanotechnology , organic chemistry , chemistry , composite material , physics , meteorology , engineering
Multiwalled cacbon nanotubes (MWNTs) were synthesized by Thermal - Chemical Vapor Deposition (T-CVD) technique using Fe/Ni/Al2O3. Acetylene was used as the source of cacbon and Argon as the carrier gas. The pyrolysis of hydrocacbon was investigated in the range of 400 – 750oC to find out the optimal temperature and the growth mechanism of MWNTs would be discussed. By comparing the degree of crystallization (or graphitic level) of synthesized MWNTs, it was observed that at 6500C, the tube diameter obtained about 10- 20 nm and reaching the highest crystallization level. MWNTs getting at 650oC were then purified through two-step process: air oxidation and acid treatment. The results showed that purification process could produce high purity MWNTs (≈95%).