tailieunhanh - Báo cáo hóa học: " High-yield Synthesis of Multiwalled Carbon Nanotube by Mechanothermal Method"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: High-yield Synthesis of Multiwalled Carbon Nanotube by Mechanothermal Method | Nanoscale Res Lett 2009 4 296-302 DOI S11671-008-9240-3 NANO EXPRESS High-yield Synthesis of Multiwalled Carbon Nanotube by Mechanothermal Method S. A. Manafi M. H. Amin M. R. Rahimipour E. Salahi A. Kazemzadeh Received 11 July 2008 Accepted 30 December 2008 Published online 22 January 2009 to the authors 2009 Abstract This study reports on the mechanothermal synthesis of multiwalled carbon nanotube MWCNTs from elemental graphite powder. Initially high ultra-active graphite powder can be obtained by mechanical milling under argon atmosphere. Finally the mechanical activation product is heat-treated at 1350 C for 2-4 h under argon gas flow. After heat-treatment active graphite powders were successfully changed into MWCNTs with high purity. The XRD analyses showed that in the duration 150 h of milling all the raw materials were changed to the desired materials. From the broadening of the diffraction lines in the XRD patterns it was concluded that the graphite crystallites were nanosized and raising the milling duration resulted in the fineness of the particles and the increase of the strain. The structure and morphology of MWCNTs were investigated using scanning electron microscopy SEM and high-resolution transmission electron microscopy HRTEM . The yield of MWCNTs was estimated through SEM and TEM observations of the as-prepared samples was to be about 90 . Indeed mechanothermal method is of interest for fundamental understanding and improvement of commercial synthesis of carbon nanotubes CNTs . As a matter of fact the method of mechanothermal guarantees the production of MWCNTs suitable for different applications. Keywords Carbon nanotubes Mechanothermal Nanotechnology Advanced materials Outstanding structure S. A. Manafi El M. H. Amin M. R. Rahimipour E. Salahi A. Kazemzadeh Ceramic Department Materials and Energy Research Center . Box 14155-4777 Tehran Iran e-mail ali_manafi2005@ Introduction Since the time of discovery by lijima 1 there has .