Study of the surface modification with oleic acid of nanosized HfO 2 synthesized by the polymerized complex derived sol-gel method

R. Ramos-González*, L. A. García-Cerda, M. A. Quevedo-López

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

The synthesis of nanosized hafnium oxide by the polymerized complex derived sol-gel method is reported. The structural and morphological characterization of the HfO 2 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 HfO 2 nanoparticle surface and confirm the formation of a monomolecular layer of oleic acid surrounding the HfO 2 . The cover density of oleic acid on the HfO 2 increases with the amount of oleic acid used to modify the nanoparticles and the surface properties of HfO 2 nanoparticles modified with oleic acid change from hydrophilic to hydrophobic.

Original languageEnglish
Pages (from-to)6034-6039
Number of pages6
JournalApplied Surface Science
Volume258
Issue number16
DOIs
StatePublished - 1 Jun 2012
Externally publishedYes

Bibliographical note

Funding Information:
The authors thank the Mexican Council of Science and Technology (CONACyT) for its financial support to carry out this investigation project (Grant No. 133991). Rodolfo Ramos-González acknowledges CONACyT for the scholarship (No. 170601) to carry out his doctorate studies and the economic support for his stay as graduate research scholar at The University of Texas at Dallas under the program “becas mixtas”.

Keywords

  • Lipophilic degree
  • Nanoparticles
  • Oleic acid
  • Surface modification

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