Surface modification and functionalization of meso-sized carbon tubes

Abstract

In this article, the specific surface area (Ssol) and pore size distribution were determined by BET absorption at a low temperature of 77K. The purpose of the work is to determine the level of functionality and surface modification of meso-sized carbon tubes. According to the BET model, the specific surface area was calculated and the BJH model of the pore size distribution in the material was used. The morphology of mesoporous carbon was studied using transmission electron microscopy and scanning electron microscopy. Differential scanning calorimetry and thermogravimetric analysis of the synthesis products were performed in the air to determine the leaching conditions. According to thermogravimetric data, the amount of unstructured forms of meso-sized carbon in the samples of meso-sized carbon tubes with a multi-walled mesoporous structure decreases several times, from 2.0-8.0% to 0.5-2%. Electron microscopy confirmed the effectiveness of air annealing. A comparison of different methods of processing meso-sized carbon tubes with a multi-walled mesoporous structure shows the advantages of using nitric acid as a modifying agent, since it promotes the formation of structural fragments of the most molecules among the oxidizing agents used, which are easy to use and by simple washing with water is easily removed from the system without absorption in meso-sized carbon tubes with a multi-walled mesoporous structure. Meso-sized carbon tubes with a multi-walled mesoporous structure processed in nitric acid, as well as the first ones, showed stability up to 450-500 °C when heated in air. Their structural and electronic characteristics, calculated from Raman spectra and diffraction data, remained virtually unchanged. The method of X-ray diffraction of oxidized samples indicates almost complete removal of the metal.