Effect of surface modification on the dielectric properties of BaTiO 3 Nanocrystals

Christopher W. Beier, Marie Heffern, Richard L. Brutchey

Research output: Contribution to journalArticle

52 Scopus citations

Abstract

We present the first direct comparison of the dielectric properties of organically modified BaTiO3 nanocrystals with unmodified BaTiO 3 nanocrystals. Well-defined 6 nm BaTiO3 nanocrystals were functionalized with n-hexylphosphonic acid (HPA) to give a surface coverage of 2.4 phosphonate groups/nm2. Chemisorption of HPA to the oxide surface occurs mainly via tridentate bonding of the deprotonated phosphonate, as determined by 31P MAS NMR, FT-IR, and XPS spectroscopies. The HPA-modified BaTiO3 (HPA-BaTiO3) nanocrystals possess improved dielectric properties, as demonstrated by decreased sensitivity to temperature and frequency for both the dielectric constant and dielectric loss. HPA-BaTiO3 had a much lower dielectric loss than unmodified BaTiO3, which also indicates an improvement in the dielectric quality of the material. Such improvements are of potential importance for the fabrication of high energy density nanocomposites.

Original languageEnglish (US)
Pages (from-to)5067-5071
Number of pages5
JournalLangmuir
Volume26
Issue number7
DOIs
StatePublished - Apr 6 2010
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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