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: Scalable synthesis of aligned carbon nanotubes bundles using green natural precursor: neem oil | Kumar et al. Nanoscale Research Letters 2011 6 92 http content 6 1 92 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Scalable synthesis of aligned carbon nanotubes bundles using green natural precursor neem oil Rajesh Kumar Radhey Shyam Tiwari Onkar Nath Srivastava Abstract Practical application of aligned carbon nanotubes ACNTs would have to be determined by a matter of its economical and large-scale preparation. In this study neem oil also named Margoaa oil extracted from the seeds of the neem-Azadirachta indica was used as carbon source to fabricate the bundles of ACNTs. ACNTs have been synthesized by spray pyrolysis of neem oil and ferrocene mixture at 825 C. The major components of neem oil are hydrocarbon with less amount of oxygen which provided the precursor species in spray pyrolysis growth of CNTs. The bundles of ACNTs have been grown directly inside the quartz tube. The as-grown ACNTs have been characterized through Raman spectroscopy scanning and transmission electron microscopic SEM TEM techniques. SEM images reveal that the bundles of ACNTs are densely packed and are of several microns in length. High-resolution TEM analysis reveals these nanotubes to be multi-walled CNTs. These multi-walled CNTs were found to have inner diameter between 15 and 30 nm. It was found that present technique gives high yield with high density of bundles of ACNTs. Introduction Advanced carbonaceous materials have drawn great attention throughout the world because of their particular microstructures unique properties and great potential applications in many fields. Several carbon species such as methane acetylene benzene xylene toluene etc. have been used as a carbon feedstock to synthesize CNTs 1-7 . These carbon precursors are related to fossil fuels which may not be sufficiently available in near future so in order to develop a more competitive carbon material it is necessary to consider developing carbonaceous .
