Impedance Analysis of Dielectric Nanoparticles Enabled via a Self-assembled Monolayer

Abstract

Impedance spectroscopy has been shown to be a powerful tool to investigate the dielectric characteristics of powders suspended in suitable liquids. the electrical and dielectrical contributions of different components of the slurry can be extracted from the impedance spectra through measurement of frequency-dependent relaxations. However, for ferroelectric powders that possess innate surface conductivity, such as BaTiO3, nanoparticles have sufficient conductivity to exclude low-frequency fields that preclude impedance characterization of the particle core. in this work, the slurry technique is shown to be effective for dielectric characterization of not only micrometer-sized particles through equivalent circuit modeling but also applicable to nanometer size dielectric particles upon remediating the conductive surface defect. Application of a self-assembled monolayer (SAM) onto the nanoparticle as a surface passivation layer reduces the surface conductivity, stabilizes the nanoparticles to dissolution, and allows a reproducible measurement and modeling of the nanoparticle dielectric characteristics including nanoparticle permittivity. the dielectric permittivity of surface passivated, ∼40 nm diameter barium titanate particles was measured to be εr ∼ 135. © 2013 the American Ceramic Society.

Department(s)

Chemistry

Second Department

Materials Science and Engineering

International Standard Serial Number (ISSN)

0002-7820

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2013 Wiley-Blackwell, All rights reserved.

Publication Date

01 Jan 2013

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