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báo cáo hóa học:" Synthesis and Enhanced Field-Emission of Thin-Walled, Open-Ended, and Well-Aligned N-Doped Carbon "

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: Synthesis and Enhanced Field-Emission of Thin-Walled, Open-Ended, and Well-Aligned N-Doped Carbon | Nanoscale Res Lett 2010 5 941-948 DOI 10.1007 s11671-010-9586-1 NANO EXPRESS Synthesis and Enhanced Field-Emission of Thin-Walled Open-Ended and Well-Aligned N-Doped Carbon Nanotubes Tongxiang Cui Ruitao Lv Feiyu Kang Qiang Hu Jialin Gu Kunlin Wang Dehai Wu Received 10 January 2010 Accepted 16 March 2010 Published online 31 March 2010 The Author s 2010. This article is published with open access at Springerlink.com Abstract Thin-walled open-ended and well-aligned N-doped carbon nanotubes CNTs on the quartz slides were synthesized by using acetonitrile as carbon sources. As-obtained products possess large thin-walled index TWI defined as the ratio of inner diameter and wall thickness of a CNT . The effect of temperature on the growth of CNTs using acetonitrile as the carbon source was also investigated. It is found that the diameter the TWI of CNTs increase and the Fe encapsulation in CNTs decreases as the growth temperature rises in the range of 780-860 C. When the growth temperature is kept at 860 C CNTs with TWI 6.2 can be obtained. It was found that the filedemission properties became better as CNT growth temperatures increased from 780 to 860 C. The lowest turn-on and threshold field was 0.27 and 0.49 V m respectively. And the best field-enhancement factors reached 1.09 X 105 which is significantly improved about an order of magnitude compared with previous reports. In this study about 30 X 50 mm2 free-standing film of thin-walled open-ended well-aligned N-doped carbon nanotubes was T. Cui R. Lv F. Kang J. Gu Laboratory of Advanced Materials Department of Materials Science and Engineering Tsinghua University Beijing 100084 China e-mail fykang@tsinghua.edu.cn Q. Hu Department of Electronic Engineering Tsinghua University Beijing 100084 China K. Wang D. Wu Department of Mechanical Engineering Key Laboratory for Advanced Manufacturing by Materials Processing Technology of Ministry of Education Tsinghua University Beijing 100084 China also prepared. The .