Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Synthesis of Nano Sized Cobalt Powder from Cobalt Sulfate Heptahydrate by Liquid Phase Reduction

액상환원공정을 이용한 황산코발트로부터의 코발트 나노분말 합성

  • An, Se-Hwan (Department of Materials Science and Engineering, Hanyang University) ;
  • Kim, Se-Hoon (Department of Materials Science and Engineering, Hanyang University) ;
  • Lee, Jin-Ho (Department of Materials Science and Engineering, Hanyang University) ;
  • Hong, Hyun-Seon (Specialty Materials R&D Team for Clean procococesses, Institute for Advanced Engineering (IAE)) ;
  • Kim, Young-Do (Department of Materials Science and Engineering, Hanyang University)
  • 안세환 (한양대학교 신소재공학과) ;
  • 김세훈 (한양대학교 신소재공학과) ;
  • 이진호 (한양대학교 신소재공학과) ;
  • 홍현선 (고등기술연구원 청정재료 공정연구) ;
  • 김영도 (한양대학교 신소재공학과)
  • Received : 2011.05.04
  • Accepted : 2011.05.23
  • Published : 2011.06.27
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Abstract

Nanostructured cobalt materials have recently attracted considerable attention due to their potential applications in high-density data storage, magnetic separation and heterogeneous catalysts. The size as well as the morphology at the nano scale strongly influences the physical and chemical properties of cobalt nano materials. In this study, cobalt nano particles synthesized by a a polyol process, which is a liquid-phase reduction method, were investigated. Cobalt hydroxide ($Co(OH)_2$), as an intermediate reaction product, was synthesized by the reaction between cobalt sulphate heptahydrate ($CoSO_4{\cdot}7H_2O$) used as a precursor and sodium hydroxide (NaOH) dissolved in DI water. As-synthesized $Co(OH)_2$ was washed and filtered several times with DI water, because intermediate reaction products had not only $Co(OH)_2$ but also sodium sulphate ($Na_2SO_4$), as an impurity. Then the cobalt powder was synthesized by diethylene glycol (DEG), as a reduction agent, with various temperatures and times. Polyvinylpyrrolidone (PVP), as a capping agent, was also added to control agglomeration and dispersion of the cobalt nano particles. The optimized synthesis condition was achieved at $220^{\circ}C$ for 4 hours with 0.6 of the PVP/$Co(OH)_2$ molar ratio. Consequently, it was confirmed that the synthesized nano sized cobalt particles had a face centered cubic (fcc) structure and with a size range of 100-200 nm.

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