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Abnormal Grain Growth
Our group has suggested the sub-boundary enhanced solid-state wetting mechanism for abnormal grain growth (AGG), which takes place in many metallic systems especially after recrystallization of deformed polycrystals, by the anisotropy of boundary energy instead of boundary mobility. According to this mechanism, sub-boundaries with extremely low energy play a key role in inducing AGG and wetting in solid state can occur under the condition of anisotropy boundary energy which satisfies wetting criteria. To confirm whether the …
Diamond Thin Film Deposition by Hot-Wire CVD
Diamond is promising materials in hard coating and semiconductor industries. According to the ‘theory of charged nanoparticles’, nanoparticles are generated during hot wire chemical vapor deposition process in the gas phase nucleation and it can be charged by thermionic emission. The purpose of this study is, based on ‘theory of charged nanoparticles’, to develop the diamond thin film deposition process and understand the mechanisms of diamond thin film formation. To study the new process parameters related charged n…
CNPs during the Synthesis of ZnO Nanostructures
According to the theory of charged nanoparticles (TCN) suggested by Hwang et al. (2004, 2010), charged nanoparticles (CNPs) are generated in the gas phase and become building blocks for thin films, nanowires, and other nanostructure in the chemical vapor deposition (CVD) process, which is drastically different from the previous belief that the building blocks for them are believed to be atoms or molecules. Motivated by these studies, the purpose of our work is to confirm whether CNPs are generated in the gas phase during the…
Charge-Enhanced Diffusion
In the chemical vapor deposition (CVD) process, the generation of charged nanoparticles is so general that it appears to be the rule rather than the exception. Therefore, direct evidence of charged cluster is the key in our assumption and has many problem that must be solved. In-situ observation is one of the advanced Transmission Electron Microscope(TEM) Technologies that provide opportunities for us to improve the charge effect for nanoparticles. In electron irradiation in TEM, that makes the charge environment about non-c…
Observation of Diamond Nanoparticles Generated in the Gas Phasse
The generation of nanoparticles in the gas phase during the chemical vapor deposition (CVD) process has been frequently reported with their subsequent deposition into films and nanostructures in many systems such as carbon, silicon and zinc oxide. To confirm the generation of diamond nanoparticles in the gas phase under the synthesis condition of diamond films by hot wire CVD (HWCVD), the transmission electron microscope (TEM) grid membrane was exposed for 1 ~ 10 sec using a capturing system and the grid membrane was observe…

서울 관악구 관악로 1 서울대학교, 재료공학부 31동 314호 박막및미세조직실험실 (08826)
Thin Films and Microstructure Lab., 31-314 Department of Materials Science and Engineering, Seoul National Univ., 1 Gwanak-ro, Gwanak-gu, Seoul, Korea (Zip 08826)
TEL +82-2-880-9152 (31-314), +82-2-880-8862 (30-304), +82-2-880-5511 (131-404)

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