Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: C1.00093 : Effect of Metal-Dielectric Interface on Capacitor Functions of Ag-Polymer Nanocomposites at Low Frequency ($<$ 1 MHz)
Author:
Metal-dielectric interfaces greatly influence the capacitor
functions of
nanodielectric composites. Nanodielectric composites of silver in
PMMA were
fabricated by electron-beam-assisted vapor phase codeposition at
ambient
temperature ($\sim $ 35\r{ } C) in high vacuum. The fabricated
samples
containing 15- 65{\%} silver reveal unique interfacial structure
as studied
by X-ray and atomic force microscopy. The capacitance of the as
prepared
samples were measured with an Agilent LCR meter at frequencies
ranging from
20 Hz to 1 MHz. All nanodielectric composites show similar capacitor
characteristic with a capacitor density of about 2.0 nF at 20 Hz
to about
0.2 nF at 1 MHz., revealing continuous decrease in capacitor
density with
increasing frequency. This continuous decrease is a direct result
of the
interface between the silver granules and the dielectric
material. This
behavior, however, is in clear contrast with our recent study of
BTO-PMMA
nanocomposites (A. Biswas, et al., NNL, Vol. 1, 111-118, 2009),
which show a
stable capacitor function over a wide frequency range (20-80 MHz).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.C1.93
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