MODIFICATION AND INTERCALATION OF CARBON NANOTUBES. CHEMICAL MODIFICATIONS. SURFACE MODIFICATION OF CNTS BY AMIDATION AND ESTERIFICATION

Mamatkodirov B.D., Yakubov.Y.Y.,  Mukhammadaliev Kh.G.,Serobov A.N.,Orunbaev H.G.,Samandarov E. Sh., Kodamboev P. K.,

Authors

Mamatkodirov B.D., Yakubov.Y.Y., Mukhammadaliev Kh.G.,Serobov A.N.,Orunbaev H.G.,Samandarov E. Sh., Kodamboev P. K., Institute of General and Inorganic Chemistry of Uzbekistan Academy of Sciences,100170, Mirzo Ulug'bek str., 77a. Uzbekistan.,Director of the Laboratory of Nanotechnology of the Technology Center of the Academy of Sciences of Turkmenistan. Turkmenistan.,Khorezm Mamun branch of Uzbekistan Academy of Sciences, Markaz-1, Khiva 220900, Uzbekistan.

Abstract

The impact of oxidation on the modification of single-wall carbon nanotubes (SWCNTs) through successive purification steps has been investigated. The efficient removal of metal impurities was monitored using inductively coupled plasma spectroscopy. Following acid treatment, Raman spectroscopy clearly demonstrated the intercalation of HNO₃ molecules into the bundles of SWCNTs. Simultaneously, SWCNTs underwent significant degradation and the introduction of defects. Subsequent thermal processes facilitated the removal of additional defective carbon materials and nearly complete de-intercalation of the HNO3 molecules. Changes in the structure of SWCNT bundles were observed via transmission electron microscopy. While bundles tended to separate during acid treatment, the remaining SWCNTs tended to re-form thick bundles after the full purification process. The presence of functional groups in the initial raw single-wall carbon nanotube material, their modification, and near-complete removal after the final annealing step were analyzed using Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and temperature-programmed desorption. Nitrogen adsorption isotherms, analyzed following the Brunauer–Emmett–Teller method, revealed significant alterations in pore volume and surface area throughout the purification steps.

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