Research Paper

Journal of Nanoparticle Research

, Volume 12, Issue 1, pp 199-207

Immobilization of silver nanoparticles on silica microspheres

  • Chih-Kai HuangAffiliated withInstitute of Polymer Science and Engineering, National Taiwan University
  • , Chia-Yin ChenAffiliated withInstitute of Polymer Science and Engineering, National Taiwan University
  • , Jin-Lin HanAffiliated withDepartment of Chemical and Materials Engineering, National Ilan University
  • , Chii-Chang ChenAffiliated withDepartment of Optics and Photonics, National Central University
  • , Meng-Dan JiangAffiliated withChung-Shan Institute of Science and Technology
  • , Jen-Sung HsuAffiliated withChung-Shan Institute of Science and Technology
  • , Chia-Hua ChanAffiliated withDepartment of Optics and Photonics, National Central University Email author 
  • , Kuo-Huang HsiehAffiliated withInstitute of Polymer Science and Engineering, National Taiwan University Email author 

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Abstract

The silver nanoparticles (Ag NPs) have been immobilized onto silica microspheres through the adsorption and subsequent reduction of Ag+ ions on the surfaces of the silica microspheres. The neat silica microspheres that acted as the core materials were prepared through sol–gel processing; their surfaces were then functionalized using 3-mercaptopropyltrimethoxysilane (MPTMS). The major aims of this study were to immobilize differently sized Ag particles onto the silica microspheres and to understand the mechanism of formation of the Ag nano-coatings through the self-assembly/adsorption behavior of Ag NPs/Ag+ ions on the silica spheres. The obtained Ag NP/silica microsphere conglomerates were characterized by field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and energy-dispersive spectroscopy (EDS). Their electromagnetic wave shielding effectiveness were also tested and studied. The average particle size of the obtained Ag NPs on the silica microsphere was found that could be controllable (from 2.9 to 51.5 nm) by adjusting the ratio of MPTMS/TEOS and the amount of AgNO3.

Keywords

Silver nanoparticles Silica microspheres Ag NP/silica microsphere conglomerates Self-assembly/adsorption behavior Coating