- Synthesis of Flake Ag Powder by Polyol Process
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Dong-Jin Kim, Huanzhen Liang, Jong-Gwan Ahn, Jae-Ryeong Lee, Hun-Saeng Chung
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J Korean Powder Metall Inst. 2004;11(6):477-485.
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DOI: https://doi.org/10.4150/KPMI.2004.11.6.477
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 Abstract
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- Monodispersed flaky silver powder was obtained by controlling the ratios of H_2O_2/NH_3 and Agin in a mixed solution of ethylene glycol and ammonia with an addition of PVP. The effects of NH_3/Ag,; H_2O_2/Ag;and;H_2PtCl_6/Ag on its morphology and size were investigated. In H_2O_2-NH_3-AgNO_3;system,;NH_3/Ag molar ratio was found to be an important reaction factor for the nucleation and crystal growth of Ag powder. The synthesis of flaky powder was optimized at over 6 of NH_3/Ag ;and;5;of;H_2O_2/Ag;under;1.0times10-3;of;Pt/Ag.;Moreover,;as;the; NH_3/Ag molar ratio increased, the size of precipitates was increased regardless of the amount of Pt. In the absence of H_2PtCI, the morphology and size of reduced Ag powder were found to be irregular in shape 2-4µm in diameter. However, homogenized fine Ag powder was obtained due to heterogeneous nucleation when H_2PtCI used as a cat-alyst, and flaky one was synthesized with the addition of Pt over 1.0times10-3 of Pt/Ag.
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