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An approach to durable poly(vinylidene fluoride) thin film loudspeaker

Published online by Cambridge University Press:  31 January 2011

C.S. Lee ,
J.Y. Kim ,
D.E. Lee ,
J. Joo ,
S. Han ,
Y.W. Beag  and
S.K. Koh
C.S. Lee
Affiliation:
Department of Physics and Center for Electro and Photo Responsive Molecules, Korea University, Seoul 136-701, Korea; Thin Film Technology Research Center, Korea Institute of Science and Technology, Seoul 130-650, Korea; and P&I Corporation, Seoul 131-221, Korea
J.Y. Kim
Affiliation:
Department of Physics and Center for Electro and Photo Responsive Molecules, Korea University, Seoul 136-701, Korea
D.E. Lee
Affiliation:
Department of Physics and Center for Electro and Photo Responsive Molecules, Korea University, Seoul 136-701, Korea
J. Joo
Affiliation:
Department of Physics and Center for Electro and Photo Responsive Molecules, Korea University, Seoul 136-701, Korea
S. Han
Affiliation:
P&I Corporation, Seoul 131-221, Korea
Y.W. Beag
Affiliation:
P&I Corporation, Seoul 131-221, Korea
S.K. Koh
Affiliation:
P&I Corporation, Seoul 131-221, Korea
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Abstract

The piezoelectric poly(vinylidene fluoride) (PVDF) surface possessing low surface energy was modified by the ion-assisted-reaction (IAR) method for the application of thin film speaker. The IAR-treated hydrophilic PVDF surface was investigated using atomic force microscopy and x-ray photoelectron spectroscopy. The adhesion strength between various types of electrodes and the film was dramatically improved due to the hydrophilic functional groups, such as –C–O–, –(C=O)–, –(C=O)–O–, and so forth. A durable loudspeaker film was fabricated by enhancing the adhesion between the screen-printed poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS) and the modified PVDF films. The PVDF speaker film with the PEDOT/PSS electrode showed higher durability, flatter sound pressure level characteristics, and easier processability compared to metals or indium tin oxide electrodes.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 12 , December 2003 , pp. 2904 - 2911
Copyright
Copyright © Materials Research Society 2003

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