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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*
1.Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;2.Key Lab of New Ceramic Fibers and Composites, School of Aerospace and Materials Engineering, National University of Defens;3.Key Lab of New Ceramic Fibers and Composites, School of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, 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:
附件
电子束诱导沉积纳米线的电阻与场发射特性
车仁超*1,2, 梁重云3, 周新贵4, 施洪龙3, 冯坚4, 李建奇5
1.中国科学院宁波材料技术与工程研究所,宁波315201;2.吉林大学超分子结构与材料教育部重点实验室,长春130012;3.中国科学院物理研究所,北京国家凝聚态物理国家实验室,北京1000080;4.国防科技大学航天与材料工程学院,长沙410073;5.中国科学院物理研究所,北京国家凝聚态物理国家实验室,北京100008
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
分类号: