Growth mechanism of gold nanoparticles decorated on polystyrene spheres via self-regulated reduction |
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Authors: | Chang-Pin Chang Chun-Chieh Tseng Jinn-Luh Ou Wen-Hwa Hwu Ming-Der Ger |
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Institution: | (1) Department of Applied Chemistry & Materials Science, Chung Cheng Institute of Technology, National Defense University, Tao-Yuan, Taiwan, 335, Republic of China;(2) Graduate School of Defense Science, Chung Cheng Institute of Technology, National Defense University, Tao-Yuan, Taiwan, 335, Republic of China; |
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Abstract: | Uniform polystyrene (PS) microspheres prepared for deposition of metallic nanoparticles were synthesized using the surfactant-free
emulsion polymerization based on styrene/potassium persulfate/water (St/KPS/H2O) system. Owing to the presence of sulfate groups, the PS microspheres can be utilized to reduce gold nanoparticles without
adding extra reducing agent into the mixture. The synthesis and characterization of metal-polystyrene nanocomposites are reported,
and a possible reduction mechanism is proposed: by heating the aqueous solution in the presence of metal ions and PS, the
sulfate chain end groups of the PS hydrolyzed and transformed to hydroxyl groups firstly. The hydroxyl groups function as
a reducing agent, and carboxylic groups provide a site to adsorb the gold nuclei. The Au nanoparticles grow in size with the
coalescence and dissolving of nuclei through the Ostwald ripening process. The PS microspheres and Au nanoparticles were characterized
by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, X-ray power
diffraction, and thermal gravimetric analysis. |
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