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Effects of preparation conditions on the synthesis of nano-sized Ag metal particles by the wet-process using 3-mercapto-propionic acid

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By the addition of sodium borohydride as a reducing agent into an aqueous solution of AgNO3 mixed with 3-mercapto-propionic acid as a protective agent, nano-sized Ag metal particles could be synthesized. Using this advanced wet-process the synthesis of an aqueous Ag colloid system with a high density became possible, because the surfaces of the synthesized nano-sized Ag metal particles were covered and protected by the adsorbed 3-mercapto-propionic acid. By changing the mix ratio of AgNO3 to 3-mercapto-propionic acid, the particle size of synthesized nano-sized Ag metal particles could be controlled; a higher 3-mercapto-propionic acid/AgNO3 ratio was preferable in the synthesis of smaller Ag metal particles. From the relationship between the Ag metal particle size and the residual S content adsorbed on the metal particles, the mechanism of dispersion of Ag particles can be proposed as that the 3-mercapto-propionic acid having a thiol group adsorbs on Ag particles by forming Ag–S bonds as a protective agent.

Affiliations: 1: Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1Yamada-oka, Suita, Osaka 565-0871, Japan; Functional Materials R&D Division, R&D Strategy Headquarters, Ishihara Sangyo Kaisha, Ltd., Yokkaichi, Mie, Japan; 2: Functional Materials R&D Division, R&D Strategy Headquarters, Ishihara Sangyo Kaisha, Ltd., Yokkaichi, Mie, Japan; 3: Department of Chemistry, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Hongou, Tokyo, Japan; 4: Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1Yamada-oka, Suita, Osaka 565-0871, Japan

10.1163/156856708784795608
/content/journals/10.1163/156856708784795608
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/content/journals/10.1163/156856708784795608
2008-05-01
2017-06-27

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