Microstructural features of nanocomposite of alumina@carbon nanotubes/alumina nanoparticles synthesized by a solvothermal method

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• 作者：Saloumeh Mesgari Abbasi^a ; ^{Mesgari.s@gmail.com} ; ^{s.mesgari@srbiau.ac.ir} ; Ali Nemati^a ; Alimorad Rashidi^b ; Kaveh Arzani^a
• 关键词：B. Nanocomposite ; Solvothermal ; Multi-walled carbon nanotubes ; Gamma alumina ; Boehmite ; Microstructure
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：July, 2012
• 卷：38
• 期：5
• 页码：3991-3998
• 文件大小：1373 K

摘要

The present study focuses on the synthesis of nanocomposite gamma alumina (纬-Al₂O₃), boehmite and multi- walled carbon nanotubes (MWCNTs) via a solvothermal procedure. The method is based on the ex situ filling of opened CNTs by liquid reactants. The microstructure and morphology of the synthesized nanocomposite Al₂O₃@CNTs/Al₂O₃ was characterized by high resolution transmission electron microscopy (HRTEM), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and N₂ adsorption-desorption analysis.

Based on the experimental results, it was determined that the volume ratio of 纬-Al₂O₃/MWCNTs and the surface tension of the solvent both greatly influence the morphology of the nanocomposite. The resultant MWCNTs were coated and filled by homogeneous and uniform boehmite and 纬-Al₂O₃ layers and nanoparticles with thicknesses of 1-3 nm and diameters of 20-40 nm, when the volume ratio of 纬-Al₂O₃/MWCNT_S is 1 and the surface tension of the solvent is approximately 26 mN m^鈭? at 20 掳C, far below the maximum value (100-200 mN m^鈭?) for MWCNT filling.