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Phase-equilibrium-dominated VLS Growth Mechanism and Kinetic Study of 1-dimensional Nanomaterials

Author: CaiZuo
Tutor: WangXiZhang；HuZheng
School: Nanjing University
Course: Chemical Engineering
Keywords: One-dimensional nanomaterials VLS Growth Mechanism Nanowires Alloy powder Growth kinetics One-dimensional nanostructures Particle Gas - liquid - solid growth Controllable Preparation Aluminum nitride Growth mechanism Research Progress Morphology AIN Growth model Phase equilibria Endothermic peak Catalytic Growth Nano-scale
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 68
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Abstract


One-dimensional materials due to its novel structure , excellent performance and broad prospects , by people attach great importance to its research has become highly competitive , the challenges and opportunities of the frontier , which nanomaterials Controllable Preparation is the key , it depends on reveal and a deep understanding of their growth mechanism . VLS growth mechanism is widely used to guide the preparation of one-dimensional nanomaterials , it is put forward in the 1960s by the Bell Laboratory RSWagner , etc. to explain the growth mechanism of Si whiskers growth model came to be widely used in understand the growth process of one-dimensional nanomaterials . A long time, despite a lot of experimental evidence phenomenological , but a lack of understanding of the nature of the growth model . Combined with our research group has been the basis for the work of the paper around the expansion of the phase equilibrium dominated gas - liquid - solid growth mechanism of universal growth kinetics to carry out research work , the research progress include : 1 in the Fe-Si alloys system nitride Preparation of Si3N4 nanowires obtained new evidence of phase equilibria led VLS growth mechanism . 2 . Currently , the Phase Equilibria led VLS growth mechanism is still in the thermodynamically level , a deep understanding of the growth kinetics of one-dimensional materials help controllable preparation of these nanomaterials . Thermal analysis technique to explore the growth of one-dimensional nanomaterials macro dynamics , Al-Ni alloy nitride , for example , the establishment of dynamic model , the activation energy of the growth process and the pre-exponential factor macroscopic kinetic parameters .

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