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Synthesis of Double-Walled Carbon Nanotubes by High-Vacuum Chemical Vapor Deposition from Alcohol

Category : Physical Science
Author : Worawut Muangrat*, Lei Shi, Winadda Wongwiriyapan, Thanattha Chobsilp, Visittapong Yordsri, Chanchana Thanachayanont, Thomas Pichler
Email : worawut.muangrat@gmail.com
Keyword : Double-walled carbon nanotubes, High-vacuum chemical vapor deposition, Ethanol
Volume : Microsc. Microanal. Res. 2017 30(1)
DOI Number : 10.14456/microsc-microanal-res.2017.5
Download Start & End Page : 20 - 23


Double-walled carbon nanotubes (DWNTs) were synthesized by high-vacuum chemical vapor deposition (HVCVD) at 875-1000 °C using ethanol and ammonium iron (III) citrate as carbon source and metal catalyst, respectively. Synthesized DWNTs were purified by acid and thermal treatments to remove the metal catalyst and amorphous carbon. Transmission electron microscopy (TEM) and Raman spectroscopy were utilized for characterization of the structure, diameter, crystallinity and purity of DWNTs. By Raman spectroscopy analysis, we found that the optimized synthesis temperature for high quality DWNTs was 900 °C. After purification process, the purity of purified DWNTs was 2.1-fold higher than that of as-grown DWNTs. TEM images revealed the purified synthesized DWNTs at 900 °C with inner and outer diameters of 1.02±0.03 and 1.72±0.05 nm, respectively. These results imply that synthesis temperature and treatment process are key parameters that affect structure, crystallinity and purity of DWNTs.

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