Synthesis and structural control of gold nanoparticles-coated polystyrene composite particles based on colloid thermodynamics

Gold nanoparticles-coated polystyrene (AuNPs-coated PS) composite particles with raspberry-like morphology are successfully prepared by blending the preformed aqueous dispersions of PS microspheres and AuNPs based on colloid thermodynamics. A series of thermodynamic factors is systematically investigated for the influence on the heterocoagulation between the PS microspheres and AuNPs. The synthesized AuNPs-coated PS composite particles have been extensively characterized by scanning electron microscopy, transmission electron microscopy, thermogravimetry and zeta potential measurement. The results indicate that the structure and morphology of the resultant AuNPs-coated PS composite particles are significantly affected by the amount of poly(vinylpyrrolidone), the pH and composition of medium.