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

作者：Abbasi Saloumeh Mesgari^*; Nemati Ali; Rashidi Alimorad; Arzani Kaveh

来源：Ceramics International, 2012, 38(5): 3991-3998.

DOI：10.1016/j.ceramint.2012.01.054

• Nanocomposite
• Solvothermal
• Multi-walled carbon nanotubes
• Gamma alumina
• Boehmite
• Microstructure

The present study focuses on the synthesis of nanocomposite gamma alumina (gamma-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 N-2 adsorption-desorption analysis.
Based on the experimental results, it was determined that the volume ratio of gamma-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 gamma-Al2O3 layers and nanoparticles with thicknesses of 1-3 nm and diameters of 20-40 nm, when the volume ratio of gamma-Al2O3/MWCNTs is 1 and the surface tension of the solvent is approximately 26 mN m(-1) at 20 degrees C, far below the maximum value (100-200 mN m(-1)) for MWCNT filling.

• 出版日期2012-7