Formation of gold and silver nanostructures within polyvinylpyrollidone (PVP) gel

被引:72
作者
Kan, Caixia [1 ]
Wang, Changshun [1 ]
Zhu, Jiejun [2 ,3 ]
Li, Hongchen [1 ]
机构
[1] Nanjing Univ Aeronaut & Astronaut, Coll Sci, Nanjing 211100, Peoples R China
[2] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
[3] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
基金
中国国家自然科学基金;
关键词
Metal nanostructure; Optical absorption; Crystal growth; PVP; METAL NANOPARTICLES; OPTICAL-PROPERTIES; SHAPE; SIZE; NANOCRYSTALS; NANOWIRES; AU;
D O I
10.1016/j.jssc.2010.01.021
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Study on reduction of Au(III) and Ag(I) and the formation of Au and Ag nanostructures was performed on the gels of metal precursor and PVP polymer mixture. Some comparing samples were prepared for better understanding the role of reactants on the reduction of metal ions and further growth of nanocrystals. The results suggest that, in addition to its function of generating stable colloids, PVP not only has a reducing effect on metal ions, but also acts as a crystal growth modifier. At low temperatures, the reducing effect of PVP is strong on Ag(I) ions in AgNO3, while the reduction of complex Au(III) ions in HAuCl4 is slow, involving two steps of Au(III)-> Au(I)-> Au. In the study of temperature disturbance on crystal growth, Au nanoplates of new and well-defined star shape were observed. The differences in the size and shape of nanoparticles are discussed from the colloid chemistry. (C) 2010 Elsevier Inc. All rights reserved.
引用
收藏
页码:858 / 865
页数:8
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