单壁碳纳米管电子束加工过程中纳米曲率效应和非热激活效应研究

The unique tube-like structure of single walled carbon nanotube and its potential applications in nanodevices has attracted a lot of research attention. Nevertheless, in the existing literature, the effects of the electron beam irradiation and nanoprocessing of single walled carbon nanotube are almost all considered and explained based on the classic knock-on mechanism. The project herein is proposed to further systematically investigate effect of electron beam irradiation on single walled carbon nanotube via in-situ high voltage transmission electron microscope observation technique. Arming to break through the existing knock-on mechanism and concept, the project is to observe interaction of focused and unfocused energetic electron beam with single walled carbon nanotube and to study the consequent structural changes of single walled carbon nanotubes of deferent curved shapes or settings. The project research will focus on nanocurvature effect of the single walled carbon nanotubes and athermal activation effect of the beam irradiation as generally neglected in the current literature as well as resultant structural change (i.e., athermal atom “diffusion” or “evaporation”) and nanoprocessing. The final goal of the project is to provide credible parameters and scientific basis for stability, fabrication, processing, and electron microscope observation of single walled carbon nanotube-based devices of new generation.

单壁碳纳米管由于其独特的管状纳米结构及其潜在纳米器件应用备受关注，但现有文献中有关单壁碳纳米管电镜原位电子束辐照和纳米加工效应几乎都是基于传统knock-on机制来考虑和解释的。本项目拟采用高压透射电镜原位观察技术，进一步开展电子束对单壁碳纳米管辐照效应系统深入研究。我们拟试图突破现有文献中knock-on机制和概念，来观察高能聚焦和非聚焦电子束与单壁碳纳米管独特的管状结构交互作用，研究电子束辐照引起的不同形态弯曲的单壁碳纳米管结构的各种变化，重点研究文献中忽略的纳米曲率效应和电子束辐照诱导非热激活效应及由此引起的原子“扩散”和“融蒸”和纳米加工。以期为确定新一代单壁碳纳米管器件稳定性、制备、电子束加工工艺及其电镜检测提供可靠参数和科学依据。

单壁碳纳米管由于其独特的管状纳米结构及其潜在纳米器件和纳米技术应用备受关注，但现有文献中有关单壁碳纳米管电镜原位电子束辐照和纳米加工效应几乎都是基于传统knock-on机制来考虑和解释的。本项目在我们长期对离子束和电子束诱导硅锗材料中纳米孔结构不稳定性及对电子束辐照下的晶态和非晶态纳米线结构不稳定性系统研究基础上，采用高压透射电镜原位观察技术，进一步开展了电子束对单壁碳纳米管辐照效应系统深入研究。我们突破了现有文献中knock-on机制和概念，观察了高能聚焦和非聚焦电子束与单壁碳纳米管独特的管状结构交互作用，研究了电子束辐照引起的不同形态弯曲的单壁碳纳米管结构的各种变化，重点研究了文献中忽略的纳米曲率效应和电子束辐照诱导非热激活效应及由此引起的原子“扩散”和“融蒸”和纳米加工。项目研究可为确定新一代单壁碳纳米管器件稳定性、制备、电子束加工工艺及其电镜检测提供可靠参数和科学依据。