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- 액상환원공정을 이용한 나노 코발트 분말의 합성
- 홍현선, 고영대, 강이승, 김건홍, 정항철
- Preparation of the Nano Cobalt Powder by Wet Chemical Reduction Method
- Hyun-Seon Hong, Young-Dae Ko, Lee-Seung Kang, Geon-Hong Kim, Hang-Chul Jung
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Journal of Korean Powder Metallurgy Institute 2011;18(3):244-249
DOI: https://doi.org/10.4150/KPMI.2011.18.3.244
2고등기술연구원 플랜트엔지니어링센터
3고등기술연구원 플랜트엔지니어링센터
4고등기술연구원 플랜트엔지니어링센터
5고등기술연구원 플랜트엔지니어링센터
1Plant Engineering Center, Institute for Advanced Engineering(IAE)
2Plant Engineering Center, Institute for Advanced Engineering(IAE)
3Plant Engineering Center, Institute for Advanced Engineering(IAE)
4Plant Engineering Center, Institute for Advanced Engineering(IAE)
5Plant Engineering Center, Institute for Advanced Engineering(IAE)
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Abstract
Spherical nanosized cobalt powder with an average size of 150-400 nm was successfully prepared at room temperature from cobalt sulfate heptahydrate (CoSO_4cdot7H_2O). Wet chemical reduction method was adopted to synthesize nano cobalt powder and hypophosphorous acid (H_3PO_2) was used as reduction agent. Both the HCP and the FCC Co phase were developed while CoSO_4cdot7H_2O concentration ranged from 0.7 M to 1.1 M. Secondary phase such as Co(OH)_2 and CO_3O_4 were also observed. Peaks for the crystalline Co phase having HCP and FCC structure crystallized as increasing the concentration of H_3PO_2, indicating that the amount of reduction agent was enough to reduce Co(OH)_2. Consequently, a homogeneous Co phase could be developed without second phase when the H_3PO_2/CoSO_4cdot7H_2O ratio exceeded 7.
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