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Preparation and photothermal study of polystyrene coated with gold nanoshell composite particles

Journal of Materials Science, ISSN: 1573-4803, Vol: 52, Issue: 11, Page: 6581-6590
2017
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Polystyrene coated with gold nanoshell composite particles, with good photothermal properties, were prepared by electrostatic self-assembly. Firstly, polystyrene (PS) microspheres were synthesized by emulsifier-free emulsion polymerization, and it is determined that the PS microsphere has an average diameter of 165 nm, carboxyl on the surface, and its surface potential turned into +38.3 mV after modified by polyallylamine hydrochloride (PAH). Secondly, gold seeds, with an average diameter of 5.14 nm and surface potential of −10.7 mV, were prepared via sodium borohydride reducing chloroauric acid. Then, gold seeds were adsorbed on the surface of PS microspheres by electrostatic self-assembly and the composite particles were obtained after gold seeds grew multiple times. Finally, 0.3 mg/mL composite particles dispersion was irradiated with a near-infrared (NIR) light source and the temperature of the dispersion increased 13 °C after 5 min.

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