School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710062, China.
ACS Appl Mater Interfaces. 2012 Oct 24;4(10):5625-32. doi: 10.1021/am3015313. Epub 2012 Oct 1.
This paper describes a simple, mild, and environmentally friendly approach to synthesize polystyrene/Ag (PS/Ag) nanocomposite spheres, which makes use of both reducing and stabilizing functions of polyvinylpyrrolidone (PVP) in aqueous media. In this approach, monodisperse polystyrene (PS) spheres, which are used as templates for the synthesis of core-shell nanocomposite spheres, are sulfonated first. Then, Ag(NH(3))(2) ions are adsorbed onto the surface of the PS template spheres via electrostatic attraction between -SO(3)H groups (grafted on the surface of the PS template spheres) and Ag(NH(3))(2) ions. Ag(NH(3))(2) ions are then reduced by and simultaneously protected by PVP. In this way, the PS/Ag nanocomposite spheres in aqueous media are obtained through a so-called one-pot method. Neither additional reducing agents nor toxic organic solvents are utilized during the synthesis process. Furthermore, the coverage degree and the particle size of Ag nanoparticles on PS/Ag nanocomposite spheres is easily tuned by changing the concentration of Ag(NH(3))(2) ions in aqueous media. Moreover, these PS/Ag nanocomposite spheres can be used as catalyst for the reduction of organic dyes and as antibacterial agents against Salmonella and Escherichia coli. In the present study, these PS/Ag nanocomposite spheres exhibit excellent catalytic properties (both in efficiency and recyclability) for the reduction of organic dyes, and the preliminary antibacterial assays indicate that these PS/Ag nanocomposite spheres also possess extraordinary antibacterial abilities against Salmonella and Escherichia coli.
本文描述了一种简单、温和、环保的方法来合成聚苯乙烯/银（PS/Ag）纳米复合球，该方法利用了聚乙烯吡咯烷酮（PVP）在水介质中的还原和稳定作用。在这种方法中，首先将单分散的聚苯乙烯（PS）球磺化，然后通过 -SO3H 基团（接枝在 PS 模板球表面）与 [Ag(NH3)2]+离子之间的静电吸引，将 [Ag(NH3)2]+离子吸附到 PS 模板球表面上。[Ag(NH3)2]+离子随后被 PVP 还原并同时保护。通过这种方式，通过所谓的一锅法在水介质中获得 PS/Ag 纳米复合球。在合成过程中既不使用额外的还原剂也不使用有毒的有机溶剂。此外，通过改变水介质中 [Ag(NH3)2]+离子的浓度，很容易调整 PS/Ag 纳米复合球上 Ag 纳米粒子的覆盖度和粒径。此外，这些 PS/Ag 纳米复合球可用作还原有机染料的催化剂和抗沙门氏菌和大肠杆菌的抗菌剂。在本研究中，这些 PS/Ag 纳米复合球在还原有机染料方面表现出优异的催化性能（效率和可回收性），初步的抗菌试验表明，这些 PS/Ag 纳米复合球对沙门氏菌和大肠杆菌也具有非凡的抗菌能力。
