Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (03): 722-728.doi: 10.3866/PKU.WHXB20110235

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Preparation and Antibacterial Properties of Water-Soluble Ag Nanoparticles

SUN Lei1, LIU Ai-Xin1, HUANG Hong-Ying2, TAO Xiao-Jun1, ZHAO Yan-Bao1, ZHANG Zhi-Jun1   

  1. 1. Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, Henan Province, P. R. China;
    2. Medical College of Henan University, Kaifeng 475004, Henan Province, P. R. China
  • Received:2010-08-24 Revised:2010-11-01 Published:2011-03-03
  • Contact: SUN Lei
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50701016) and Natural Science Foundation of Education Department of Henan Province, China (2007150008, 2008B150003).


Water-soluble surface modified silver nanoparticles were synthesized by liquid phase reduction with tannic acid as the reductant and polyvinyl pyrrolidone (PVP) as the surface modification agent. The structure and morphology of the as-synthesized powders were investigated by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), ultraviolet-visible (UV-Vis) absorption spectroscopy, and Fourier-transform infrared (FTIR) spectrometry. The antibacterial activity of the water- soluble Ag nanoparticles against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) was investigated by broth dilution. The stable dispersion duration of the as-synthesized Ag nanoparticles in water was also determined. A mechanism for PVP modified Ag nanoparticle formation is proposed. The results show that the as-synthesized PVP modified Ag nanoparticles have a face-centered cubic crystalline structure. The average diameter of the Ag nanoparticles ranges from 15 to 17 nm. The as- synthesized powders have good solubility in water over a long period of time. PVP modified Ag nanoparticles exhibit good antibacterial properties against E. coli and S. aureus. This simple and mild preparation method can be easily increased to an industrial scale process and, therefore, PVP modified Ag nanoparticles are potentially a new type of antibacterial.

Key words: Ag nanoparticles, Water-soluble, Surface modification, “Green&rdquo, and nontoxic, Antibacterial property