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Báo cáo hóa học: " Facile Synthesis of Ternary Boron Carbonitride Nanotubes"

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: Facile Synthesis of Ternary Boron Carbonitride Nanotubes | Nanoscale Res Lett 2009 4 834-838 DOI 10.1007 S11671-009-9325-7 NANO EXPRESS Facile Synthesis of Ternary Boron Carbonitride Nanotubes Lijie Luo Libin Mo Zhangfa Tong Yongjun Chen Received 1 March 2009 Accepted 14 April 2009 Published online 5 May 2009 to the authors 2009 Abstract In this study a novel and facile approach for the synthesis of ternary boron carbonitride B-C-N nanotubes was reported. Growth occurred by heating simple starting materials of boron powder zinc oxide powder and ethanol absolute at 1150 C under a mixture gas flow of nitrogen and hydrogen. As substrate commercial stainless steel foil with a typical thickness of 0.05 mm played an additional role of catalyst during the growth of nanotubes. The nanotubes were characterized by SEM TEM EDX and EELS. The results indicate that the synthesized B-C-N nanotubes exhibit a bamboo-like morphology and B C and N elements are homogeneously distributed in the nanotubes. A catalyzed vapor-liquid-solid VLS mechanism was proposed for the growth of the nanotubes. Keywords B-C-N nanotubes Synthesis Stainless steel foil Characterization VLS model Introduction Ternary boron carbonitride B-C-N nanotubes have recently attracted much attention because of their excellent mechanical properties electrical properties and anti-oxidant capacities 1 2 . In addition theoretical studies have revealed that the band gaps of B-C-N nanotubes can be tailored over a wide range by simply varying the chemical composition rather than by geometrical structure 3-7 L. Luo L. Mo Z. Tong Y. Chen El School of Chemistry and Chemical Engineering Guangxi University Nanning 530004 China e-mail yongchen@gxu.edu.cn which is superior to their carbon and boron nitride BN counterparts. This gives B-C-N nanotubes potential for use in electronics electrical conductors high temperature lubricants and novel composites 8 . Compared with the very extensive study about carbon and BN nanotubes however very little work was reported about B-C-N nanotubes. .