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Vapor Phase Condensation Synthesis of Refractory Metal and Oxide Nano-Particles

  • : Chulwoong Han 1, Hyunwoong Na 2, Hanshin Choi 1
  • : 1 Korea Institute of Industrial Technology, 2 Yonsei University
  • : 2013, Vol 3, p. 229-234
  • : PDF Download
  • : 2013

Abstract

RF thermal plasma synthesis of nano-particles belongs to vapor phase condensation technology in which nano-particles are synthesized by following a vaporization and condensation pathway. It is advantageous for nano-particle synthesis because of wide material selectivity and process versatility. During the RF thermal plasma process, feedstock micro-powder is heated and vaporized at the heating stage and then the vapor condenses to nano-particle during cooling stage with the aid of forced quenching gas. In the present study, tungsten and molybdenum oxide and metal nano-particles were synthesized from oxide micro-feedstock with different plasma gas composition. Thank to the thermo-physical properties of refractory oxides such as much lower boiling point than their metallic components, fully vaporization is accomplished for oxide and metal nano-particles. Additionally, metallic nano-particles could be synthesized from oxide feedstock when hydrogen as a reducing agent is introduced to plasma gas. Characteristics of the process and resulting nano-particle properties were considered.

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