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Resistivity and Field Electron Emission of Nanowires Formed by Electron Beam Induced Chemical Vapor Deposition
Ren-chao Che, Chong-yun Liang, Xin-gui Zhou, Hong-long Shi, Jian Feng, Jian-qi Li*
Author NameAffiliationE-mail
Ren-chao Che Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; Key Lab of New Ceramic Fibers and Composites, School of Aerospace and Materials Engineering, National University of Defens rcche@blem.ac.cn 
Chong-yun Liang Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China  
Xin-gui Zhou Key Lab of New Ceramic Fibers and Composites, School of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China  
Hong-long Shi Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China  
Jian Feng Key Lab of New Ceramic Fibers and Composites, School of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China  
Jian-qi Li* Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China  
Abstract:
"Self-standing iron nanowires were fabricated at the apex of a tungsten needle tip by electron beam induced deposition. This sharp needle tip which adhered to the nanowire can be moved with a stepping motor and piezo-driving device, and was attached inside a specially designed transmission electron microscope pecimen holder. A copper conductor substrate, with which the approaching nanowires will build up a closed electric circuit, was set on the holder. The tungsten needle tip accompanied with the EBICVD nanowires made contact with the substrate and then a voltage was applied between the two electrodes. Resistivity values of the examined nanowires, by a devised Lock-in-Amplifier circuit, range from 0.1 -m to 10-3 -m. Our investigation might have implications in the fabrication and characterization of nano-electronics device. Precursor with phenanthrene (C4H10) was used and the deposition experiment was done using a scanning electron microscope at room temperature. It was found that the surface structure at the top of the nanorod, such as a small protrusion within only several nanometers scale, has significant influence on the field emission property. An emission current of several tens of nano-ampere flowing through this nanorod could induce resistance heating. In several minutes, this thermal energy could transform the original amorphous carbon into a graphite-like structure embedded with fullerenes. The turn-on voltage of the graphite-like nanorod was about 11 V less than that of the original amorphous case."
Key words:  Nanorods, Transmission electron microscope, Deposition, Field emission
FundProject:
电子束诱导沉积纳米线的电阻与场发射特性
车仁超*,梁重云,周新贵,施洪龙,冯坚,李建奇
摘要:
"运用电子束诱导沉积技术在钨针尖表面沉积钨纳米线.在透射电子显微镜中,原位测量单根纳米线的电阻与场发射特性,并观察其显微结构变化.样品台为特制的电性能测试样品台,包括步进电机和压电陶瓷驱动的装置.导电铜片作为与纳米线相对的另一极.自行设计制作锁相放大器电路测量纳米线的电阻.结果表明,纳米线的电阻为0.1*10-3 -m量级.纳米线头部的几何缺陷将影响其场发射特性.纳安级电流将改变纳米线头部的几何结构与微观结构.场发射开启电压比结构变化前低11 V左右."
关键词:  纳米线,透射电子显微学,沉积,场发射
DOI:10.1088/1674-0068/20/06/680-684
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