Microwave-assisted rapid facile "Green" synthesis of uniform silver nanoparticles: Self-assembly into multilayered films and their optical properties

被引:231
作者
Hu, Bo [1 ]
Wang, Shang-Bing [1 ]
Wang, Kan [1 ]
Zhang, Meng [1 ]
Yu, Shu-Hong [1 ]
机构
[1] Univ Sci & Technol China, Sch Chem & Mat, Div Nanomat & Chem, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China
基金
中国国家自然科学基金;
关键词
D O I
10.1021/jp801267j
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We report an environmentally benign process for the synthesis of nearly monodisperse silver nanoparticles in large quantities via a microwave-assisted "green" chemistry method in an aqueous system, using basic amino acids, such as L-lysine or L-arginine, as reducing agents and soluble starch as a protecting agent. The presence of amino acids with basicity such as L-lysine or L-arginine, having two amino groups in each molecule, is indispensable for the synthesis of uniform silver nanoparticles. The current synthetic process can be readily applied to large-scale production, for example, a reaction yielding 0.1 g of nearly monodisperse silver nanoparticles can be performed in a 80 mL microwave sealed vessel. This combination of solvent, renewable reactants, and microwave irradiation seem to make it clear that green chemical synthesis of metal nanoparticles with well-controlled shapes, sizes, and structures has practical potential. Self-assembly of starch-capped silver nanoparticles results in multilayered mirrorlike films forming on the glass slide surface. The surface plasmon transmission of the films has blue-shifted with decreasing silver atom concentrations of the films. The silver films offer great surface enhancement for 4-mercaptobenzoic acid (4-MBA) molecules, and the surface enhancement factor can be efficiently changed by the silver atom concentrations of the films.
引用
收藏
页码:11169 / 11174
页数:6
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