Elucidation of self-vibration phenomenon of carbon nanotubes in magnetic field and its application to nano-sensing

碳纳米管在磁场中自振动现象的阐明及其在纳米传感中的应用

• 批准号: 23656060
• 负责人: SAITO Yahachi
• 金额: $ 2.5万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23656060/
• 关键词: カーボンナノチューブ; 電子放出; 振動; 電子顕微鏡; 電界; 磁界; ローレンツ力; 電界放出; 透過電子顕微鏡; 静電気力

In-situ transmission electron microscopy (TEM) and scanning electron microscopy (SEM) of carbon nanotube (CNT) field electron emitters have been carried out in order to clarify the origin of spontaneous vibration with large amplitude. In TEM, neither field emission current nor applied voltage were decisive factors for the onset of the spontaneous vibration. Instead, it was found that the orientation of the CNT against the counter electrode was important, i.e., the spontaneous vibration was observed only when the CNT bent more than 50° by the applied electric field. For CNTs which showed spontaneous vibration, a correlation between the onset voltages for vibration and the diameter of CNTs are clearly found, but the length of CNTs showed no effect on the onset voltage. In SEM, on the other hand, even CNT emitters which bent more than 50° did not show any spontaneous vibration at all. Since the magnetic field at the SEM sample stage is much smaller than that at TEM sample stage, the difference in the CNT behavior between TEM and SEM indicates the role of the magnetic field in the induction of the spontaneous vibration; i.e., the Lorentz force between the electric current through the CNT and the magnetic field is the origin of the induction of large-amplitude vibration.

对碳纳米管（CNT）场致电子发射体进行了原位透射电子显微镜（TEM）和扫描电子显微镜（SEM）观察，以阐明大振幅自发振动的起源。在TEM中，场发射电流和外加电压都不是自发振动开始的决定性因素。相反，发现CNT相对于对电极的取向是重要的，即，只有当碳纳米管在外加电场作用下弯曲超过50°时才能观察到自发振动。对于表现出自发振动的碳纳米管，振动的起始电压与碳纳米管的直径之间的相关性被清楚地发现，但碳纳米管的长度表现出对起始电压没有影响。另一方面，在SEM中，甚至弯曲超过50°的CNT发射体也根本没有显示出任何自发振动。由于SEM样品台处的磁场远小于TEM样品台处的磁场，TEM和SEM之间CNT行为的差异表明磁场在诱导自发振动中的作用;即，通过CNT的电流和磁场之间的洛伦兹力是大振幅振动的感应的起源。

项目成果

Carbon Nanotube Field Emitters: Fundamental Properties and Applications

碳纳米管场发射体：基本特性和应用

• 发表时间: 2012
• 期刊: ECS Transactions
• 作者: 渡辺紀生;円谷雄二;島田晃広;青木貞雄;C. Y. Jin;Yahachi Saito
• 通讯作者: Yahachi Saito

炭素学

碳学

• 发表时间: 2011
• 作者: 中村新男;他
• 通讯作者: 他

カーボンナノチューブグラフェンハンドブック

碳纳米管石墨烯手册

• 发表时间: 2011
• 作者: 里村 武範;金子 祥;大井 愛実;布浦 拓郎;高木 善弘;高見 英人;高井 研;櫻庭 春彦;大島 敏久;末 信一朗;小海 文夫,他
• 通讯作者: 小海 文夫,他

名古屋大学大学院 工学研究科 量子工学専攻 齋藤弥八研究室

名古屋大学工学研究科量子工学系斋藤矢八实验室