One-Step Synthesis of Gold and Silver Hydrosols Using Poly(N-vinyl-2-pyrrolidone) as a Reducing Agent

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• 作者：Cristina E. Hoppe ; Massimo Lazzari ; Iv&aacute ; n Pardiñ ; as-Blanco ; M. Arturo Ló ; pez-Quintela
• 刊名：Langmuir
• 出版年：2006
• 出版时间：August 1, 2006
• 年：2006
• 卷：22
• 期：16
• 页码：7027 - 7034
• 全文大小：525K
• 年卷期：v.22,no.16(August 1, 2006)
• ISSN：1520-5827

文摘

Synthesis of gold and silver hydrosols was carried out in a one-step process by reduction of aqueous solutions ofmetal salts using poly(N-vinyl-2-pyrrolidone) (PVP). Both kinds of metal nanoparticles were obtained without theaddition of any other reducing agent, at low temperatures and using water as the synthesis solvent. Shape, size, andoptical properties of the particles could be tuned by changing the employed PVP/metal salt ratio. It is proposed thatPVP acts as the reducing agent suffering a partial degradation during the nanoparticles synthesis. Two possiblemechanisms are proposed to explain the reduction step: direct hydrogen abstraction induced by the metal ion and/orreducing action of macroradicals formed during degradation of the polymer. Initial formation of the macroradicalsmight be associated with the metal-accelerated decomposition of low amounts of peroxides present in the commercialpolymer.