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Adsorption and desorption phenomena on thermally annealed multi-walled carbon nanotubes by XANES study |
| Camile Rodolphe Tchenguem Kamto1, Bridinette Thiodjio Sendja2, Jeannot Mane Mane2,3 |
1 University of Yaounde I, Faculty of Science, Department of Physics, Yaounde, Cameroon;
2 University of Yaounde I, National Advanced School of Engineering, Department of Mathematic and Physical Science, Yaounde, Cameroon;
3 University of Dschang, Dschang, Cameroon |
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Abstract The multi-walled carbon nanotubes (MWCNTs) studied in this work were synthesized by the catalytic chemical vapor deposition (CCVD) process, and were thermally annealed by the hot filament plasma enhanced (HF PE) method at 550℃ for two hours. The x-ray absorption near edge structure (XANES) technique was used to investigate the adsorption and desorption phenomena of the MWCNTs at normal and grazing incidence angles. The adsorbates were found to have different sensitivities to the thermal annealing. The geometry of the incident beam consistently gave information about the adsorption and desorption phenomena. In addition, the adsorption of non-intrinsic potassium quantitatively affected the intrinsic adsorbates and contributed to increase the conductivity of the MWCNTs. The desorption of potassium was almost 70% greater after the thermal annealing. The potassium non-intrinsic adsorbates are from a physisorption mechanism whereas the intrinsic adsorbates result from chemisorption.
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Received: 15 May 2019
Revised: 12 July 2019
Accepted manuscript online:
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PACS:
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31.10.+z
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(Theory of electronic structure, electronic transitions, and chemical binding)
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31.15.ae
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(Electronic structure and bonding characteristics)
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32.30.Rj
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(X-ray spectra)
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82.80.Dx
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(Analytical methods involving electronic spectroscopy)
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Corresponding Authors:
Bridinette Thiodjio Sendja
E-mail: sbridine@yahoo.fr
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Cite this article:
Camile Rodolphe Tchenguem Kamto, Bridinette Thiodjio Sendja, Jeannot Mane Mane Adsorption and desorption phenomena on thermally annealed multi-walled carbon nanotubes by XANES study 2019 Chin. Phys. B 28 093101
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