频率可调碳纳米管谐振器的TEM原位构建

发布时间：2018-05-20 21:24

本文选题：振动与波 + 碳纳米管　；参考：《中国科技论文》2017年04期

【摘要】：提出了1种基于电子束致沉积无定形碳技术的可控调节碳纳米管谐振器频率的新方法,利用原位透射电镜技术,通过控制电子束斑的位置、大小和沉积时间,精确控制所沉积无定形碳在碳纳米管悬臂梁上的位置和质量。实验结果表明,通过在碳纳米管悬臂梁顶端沉积碳纳米颗粒可大幅度调节碳纳米管的共振频率,实现谐振频率的粗调模式,调节幅度可超过50%;若将沉积位置远离碳纳米管悬臂梁顶端,则可实现碳纳米管谐振器共振频率的精细调节,调节精度可达到2%。以实验探讨了Rayleigh-Ritz理论对于计算碳纳米管谐振器称量质量的适用性,证明所称量的纳米颗粒的质量越小,计算结果的准确性越高。
[Abstract]:A new method for controlling the frequency of carbon nanotube resonator based on electron beam deposition technique is proposed. The position, size and deposition time of electron beam spot are controlled by in situ transmission electron microscopy (TEM) technique. Accurately control the position and mass of amorphous carbon deposited on the carbon nanotube cantilever beam. The experimental results show that the resonant frequency of carbon nanotubes can be adjusted greatly by depositing carbon nanoparticles at the top of the cantilever beam of carbon nanotubes, and the coarse tuning mode of resonance frequency can be realized. If the deposition position is far away from the top of the cantilever beam of carbon nanotube, the fine tuning of resonance frequency of carbon nanotube resonator can be realized, and the adjusting precision can reach 2 parts. The applicability of Rayleigh-Ritz theory to the calculation of the weighing mass of carbon nanotube resonator is discussed experimentally. It is proved that the smaller the mass of the measured nanoparticles, the higher the accuracy of the calculated results.
【作者单位】：厦门大学萨本栋微米纳米科学技术研究院;厦门大学材料学院;
【基金】：高等学校博士学科点专项科研基金资助项目(20130121120009) 国家自然科学基金资助项目(61471307)
【分类号】：TB383.1;TH-39

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