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Materials 2013, 6(12), 5625-5638;

Facile Synthesis of Mono-Dispersed Polystyrene (PS)/Ag Composite Microspheres via Modified Chemical Reduction

College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
College of Materials Science and Engineering, Jiangsu University of Technology, Changzhou 213001, China
Authors to whom correspondence should be addressed.
Received: 8 October 2013 / Revised: 15 November 2013 / Accepted: 25 November 2013 / Published: 4 December 2013
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A modified method based on in situ chemical reduction was developed to prepare mono-dispersed polystyrene/silver (PS/Ag) composite microspheres. In this approach; mono-dispersed PS microspheres were synthesized through dispersion polymerization using poly-vinylpyrrolidone (PVP) as a dispersant at first. Then, poly-dopamine (PDA) was fabricated to functionally modify the surfaces of PS microspheres. With the addition of [Ag(NH3)2]+ to the PS dispersion, [Ag(NH3)2]+ complex ions were absorbed and reduced to silver nanoparticles on the surfaces of PS-PDA microspheres to form PS/Ag composite microspheres. PVP acted both as a solvent of the metallic precursor and as a reducing agent. PDA also acted both as a chemical protocol to immobilize the silver nanoparticles at the PS surface and as a reducing agent. Therefore, no additional reducing agents were needed. The resulting composite microspheres were characterized by TEM, field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), XRD, UV-Vis and surface-enhanced Raman spectroscopy (SERS). The results showed that Ag nanoparticles (NPs) were homogeneously immobilized onto the PS microspheres’ surface in the presence of PDA and PVP. PS/Ag composite microspheres were well formed with a uniform and compact shell layer and were adjustable in terms of their optical property. View Full-Text
Keywords: silver nanoparticle; PS/Ag composite; dopamine; PVP; hollow microsphere silver nanoparticle; PS/Ag composite; dopamine; PVP; hollow microsphere

Figure 1a

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Zhu, W.; Wu, Y.; Yan, C.; Wang, C.; Zhang, M.; Wu, Z. Facile Synthesis of Mono-Dispersed Polystyrene (PS)/Ag Composite Microspheres via Modified Chemical Reduction. Materials 2013, 6, 5625-5638.

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