Study of the surface modification with oleic acid of nanosized HfO₂ synthesized by the polymerized complex derived sol-gel method

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• 作者：R. Ramos-Gonzá ; lez^a ; ^{rramos.phd@gmail.com} ; ^{rramos@posgrado.ciqa.mx} ; L.A. Garcí ; a-Cerda^a ; M.A. Quevedo-Ló ; pez^b
• 关键词：Hafnium oxide (HfO2) ; Nanoparticles ; Surface modification ; Oleic acid ; Lipophilic degree
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：1 June, 2012
• 卷：258
• 期：16
• 页码：6034-6039
• 文件大小：1113 K

摘要

The synthesis of nanosized hafnium oxide by the polymerized complex derived sol-gel method is reported. The structural and morphological characterization of the HfO₂ was carried out by X-ray diffraction and scanning electron microscopy. The surface of hafnium oxide nanoparticles was modified by capping with oleic acid. The nanoparticle surface area was measured by the gas adsorption technique in order to determine the minimal amount of oleic acid needed to obtain a uniform coverage of the hafnium oxide. The existence of organic layer can be confirmed by Fourier transform spectroscopy, solid state nuclear magnetic resonance spectroscopy, thermal gravimetric analysis and transmission electron microscopy. The FTIR and solid state NMR results reveal that oleic acid is chemisorbed as a carboxylate onto the HfO₂ nanoparticle surface and confirm the formation of a monomolecular layer of oleic acid surrounding the HfO₂. The cover density of oleic acid on the HfO₂ increases with the amount of oleic acid used to modify the nanoparticles and the surface properties of HfO₂ nanoparticles modified with oleic acid change from hydrophilic to hydrophobic.