Mechanism of growth of colloidal silver nanoparticles stabilized by polyvinyl pyrrolidone in γ-irradiated silver nitrate solution

被引:245
作者
Shin, HS
Yang, HJ
Kim, SB
Lee, MS
机构
[1] Pohang Univ Sci & Technol, Dept Chem, Lab Vibrat Spect, Pohang 790784, South Korea
[2] Kyungpook Natl Univ, Dept Chem Educ, Teachers Coll, Taegu 702701, South Korea
关键词
silver nanoparticle; silver colloid; PVP (polyvinyl pyrrolidone); gamma-irradiation;
D O I
10.1016/j.jcis.2004.02.084
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
Silver nanoparticles were prepared by using polyvinyl pyrrolidone (PVP) as a stabilizer and gamma-irradiation. Transmission electron mi-croscopy (TEM) results showed that both the amount and the molecular weight of PVP in the irradiated solution considerably affect the average size of the silver nanoparticles. The average size of the silver nanoparticles decreases with increasing the amount of PVP in the solution, but increases with increasing its molecular weight. Further, TEM showed that the silver nanoparticles become disassembled into smaller nanoparticles after dilution with distilled water and sonication. Since the processes of dilution and sonication are not expected to result in chemical reactions or to split the silver nanoparticles, we conclude that each silver nanoparticle prepared by gamma-irradiation consists of several smaller nanoparticles surrounded by PVP. Thus, based on these observations, we propose a three-step mechanism for the growth of the silver nanoparticles under the conditions considered here. In the first step, the silver ions interact with PVP, then in the second step the silver ions that are exposed to gamma-irradiation are reduced to silver atoms; nearby silver atoms then aggregate at close range. These aggregates are the primary nanoparticles. Finally, these primary nanoparticles coalesce with other nearby primary nanoparticles or interact with PVP to form larger aggregates which are the secondary (final) nanoparticles. (C) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码:89 / 94
页数:6
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