Cross-sectional analysis of W-cored Ni nanoparticle via focused ion beam milling with impregnation

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• 作者：Saeeun Jeong (25)
  Hyunwoong Na (26)
  Gwangyeob Lee (25)
  Seong Ho Son (25)
  Hanshin Choi (25)
  
  25. Incheon Regional Division ; Korea Institute of Industrial Technology ; Incheon ; 406-840 ; Republic of Korea
  26. Department of Materials Science and Engineering ; Yonsei University ; Seoul ; 120-749 ; Republic of Korea
  
• 关键词：W ; Ni bimetallic nanoparticle ; RF thermal plasma ; Nonequilibrium phase ; Nanoparticle cross section ; TEM
• 刊名：Nanoscale Research Letters
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：9
• 期：1
• 全文大小：1,259 KB
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• 刊物主题：Nanotechnology; Nanotechnology and Microengineering; Nanoscale Science and Technology; Nanochemistry; Molecular Medicine;
• 出版者：Springer US
• ISSN：1556-276X

文摘

Tungsten and nickel bimetallic nanoparticle is synthesized by radio frequency thermal plasma process which belongs to the vapor phase condensation technology. The morphology and chemical composition of the synthesized particle were investigated using the conventional nanoparticle transmission electron microscopy (TEM) sample. A few part of them looked like core/shell structured particle, but ambiguities were caused by either TEM sample preparation or TEM analysis. In order to clarify whether a core/shell structure is developed for the particle, various methodologies were tried to prepare a cross-sectional TEM sample. Focused ion beam (FIB) milling was conducted for cold-compacted particles, dispersed particles on silicon wafer, and impregnated particles with epoxy which is compatible with electron beam. A sound cross-sectional sample was just obtained from cyanoacrylate impregnation and FIB milling procedure. A tungsten-cored nickel shell structure was precisely confirmed with aid of cross-sectional sample preparation method.