Web Release Date: January 10,
Silica Coating of Nanoparticles by the Sonogel Process
and
Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075, Singapore Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602
Received December 12, 2007
In Final Form: December 31, 2007
Abstract:
A modified aqueous sol-gel route was developed using ultrasonic power for the silica coating of indium tin oxide (ITO) nanoparticles. In this approach, organosilane with an amino functional group was first used to cover the surface of as-received nanoparticles. Subsequent silica coating was initiated and sustained under power ultrasound irradiation in an aqueous mixture of surface-treated particles and epoxy silane. This process resulted in a thin but homogeneous coverage of silica on the particle surface. Particles coated with a layer of silica show better dispersability in aqueous and organic media compared with the untreated powder. Samples were characterized by high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and the zeta potential.
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