Structure transformation of carbon nanotubes (CNTs) by heat treatment
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- Structure transformation of carbon nanotubes (CNTs) by heat treatment
- Yoo, Byungcheon
- Ding, Feng
- carbon nanotubes
- Issue Date
- Graduate School of UNIST
- Carbon nanotubes (CNTs) have been powerful candidates about various applications such as electronics, energy storages, composites for decades because their outstanding electrical, mechanical and structural properties. These properties heavily related to their structural features represented by chirality, diameter and number of walls. Therefore, structure controllable CNTs synthesis is indispensable for commercial applications. Despite of dedicated researches about effective synthesis method or post-treatment, still can’t define precise mechanisms for homogeneity CNTs growth.
In this study, we tried heat treatment of single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) as post-treatment method from 1700 ℃ to 3000 ℃ for 10 min by employing a rapid heating system which is based on joule heating that can heat up higher than 3000℃ quickly and characterized by Raman spectroscopy and transmission electron microscopy (TEM). We observed diameter enlargement of SWCNTs with increasing the temperature and MWCNTs specially, odd number of walls appear at higher than 2500 ℃. This result confirms mechanisms about transformation of SWCNTs to MWCNTs by SWCNTs bundle coalescence different from SWCNTs coalescence which induces enlarged diameter. The result of MWCNTs shows the quality improvement by defects healing and purifications at the temperature 3000 ℃ for 30 min.
Both experimental results demonstrate the effect of heat treatment as post treatment and can motivate to mechanisms for structure controllable CNTs
- Department of Materials Science and Engineering
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