Abstract
Diameters and crystallinity of multi-walled carbon nanotubes (MWCNTs) dependent on reduction temperature of the Fe–Co/MgO catalyst were investigated. MWCNTs were synthesized by catalytic chemical vapor depositing and the Fe–Co/MgO catalyst was fabricated by using a sol-gel method. According to Raman analysis, transmission electron microscopy and thermogravimetric analysis, the diameter distribution of MWCNTs was broadened with increasing reduction temperature of the Fe–Co/MgO catalyst and crystallinity was improved. The above results are attributed to an increased size and enhanced crystallinity of metal catalyst particles by increasing reduction temperature.
Highlights
Carbon nanotubes (CNTs) have been studied as an important nanomaterial since its first discovery in 1991 [1]
For various applications of CNTs, the control of the growth and properties of CNTs is inevitably necessary because CNTs indicate quietly different electrical, mechanical, and material properties according to the diameter and crystallinity [8,9,10]
Several methods have been developed for the synthesis of CNTs, such as arc-discharge, laser ablation methods, and catalytic chemical vapor deposition (CCVD) [11,12,13]
Summary
Carbon nanotubes (CNTs) have been studied as an important nanomaterial since its first discovery in 1991 [1]. Due to an excellent electrical conductivity and prominent mechanical properties, CNTs have been attracted a lot of attention in their potential applications such as field-effect transistors, field emission devices, electronic sensors, transparent electrodes, and composite materials [2,3,4,5,6,7]. For various applications of CNTs, the control of the growth and properties of CNTs is inevitably necessary because CNTs indicate quietly different electrical, mechanical, and material properties according to the diameter and crystallinity [8,9,10]. There have been many reports for the catalyst effect on the growth and properties of CNTs using the CCVD method [17,18,19,20]. It is very difficult to find detailed study for properties of CNTs dependent on reduction temperature of the catalyst until now. In this work, we deeply focused the reduction temperature effect of the catalyst on the growth of CNTs to understand a growth behavior of CNTs
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