Silica Coating of Nanoparticles by the Sonogel Process

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• 作者：Quan Chen ; Chris Boothroyd ; Gim Hong Tan ; Nelvi Sutanto ; Andrew Mcintosh Soutar ; Xian Ting Zeng
• 刊名：Langmuir
• 出版年：2008
• 出版时间：February 5, 2008
• 年：2008
• 卷：24
• 期：3
• 页码：650 - 653
• 全文大小：172K
• 年卷期：v.24,no.3(February 5, 2008)
• ISSN：1520-5827

文摘

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 surfaceof as-received nanoparticles. Subsequent silica coating was initiated and sustained under power ultrasound irradiationin an aqueous mixture of surface-treated particles and epoxy silane. This process resulted in a thin but homogeneouscoverage of silica on the particle surface. Particles coated with a layer of silica show better dispersability in aqueousand organic media compared with the untreated powder. Samples were characterized by high-resolution transmissionelectron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and the zeta potential.