In Situ Transmission Electron Microscopy Studies of Carbon by Dai-Ming Tang

By Dai-Ming Tang

Using an in situ transmission electron microscopy (TEM) method of examine the expansion mechanism of carbon nanotubes (CNTs) in addition to the fabrication and homes of CNT-clamped steel atomic chains (MACs) is the focal point of the learn summarized during this thesis. the applying of an in situ TEM strategy within the above-mentioned examine offers not just real-time remark but additionally monitored machining and structural evolvement on the atomic point. during this thesis, the writer introduces a CNT tubular nano furnace that may be operated lower than TEM for research of the CNT nucleation mechanism. by way of learning the nucleation means of CNTs within the presence of assorted catalysts, together with iron-based steel catalysts and silicon oxide-based non-metallic catalysts, the actual states of the catalysts in addition to the nucleation and development means of CNTs are published. in response to the knowledge of the nucleation mechanism, the writer proposes a hetero-epitaxial development technique of CNTs from boron nitride, which gives a brand new direction for the controllable development of CNTs. moreover, the writer offers an electron beam-assisted nanomachining strategy and the fabrication of a CNT-clamped MAC prototype machine in keeping with this method. The formation strategy of CNT-clamped Fe atomic chains (ACs) will be monitored with atomic answer. The established quantized conductance and uninfluenced half-metallic homes of Fe ACs point out that CNTs might be promising nanoscale electrodes or interconnectors for the linking and meeting of nano and subnano structures.

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Extra resources for In Situ Transmission Electron Microscopy Studies of Carbon Nanotube Nucleation Mechanism and Carbon Nanotube-Clamped Metal Atomic Chains

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However, little is known about the growth mechanism of CNTs grown from newly discovered catalysts. (c) Many prototype devices have been proposed and some of them are even commercially available. However, limited by the controllable synthesis, there is a lack of devices featured by the unique structure and properties of CNTs. 5 Motivations of the Thesis 17 The research work in this thesis is motivated by above challenges. In situ TEM techniques are used to study the CNTs growth mechanisms by comparing the states of different catalysts.

Cumings et al. peeled off the outer layers of a MWCNT with Joule heating-induced high temperature and the inner parts of the CNT could be retracted and inserted like a 28 2 In Situ TEM Method and Materials nanoscale piston [16]. Sun et al. combined the electron beam irradiation and Joule heating to shrink a nanotube and applied a high pressure on the filled metals to observe the structural evolutions [17]. 3 First Principles Calculations The advantages of in situ TEM are the real-time observations of the structural evolutions and correlations with the properties measurements.

C) Many prototype devices have been proposed and some of them are even commercially available. However, limited by the controllable synthesis, there is a lack of devices featured by the unique structure and properties of CNTs. 5 Motivations of the Thesis 17 The research work in this thesis is motivated by above challenges. In situ TEM techniques are used to study the CNTs growth mechanisms by comparing the states of different catalysts. Based on the understandings, we suggest a new route for the controllable synthesis of CNTs.

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