NDLI: Spin-cast P(VDF-TrFE) films for high performance medical ultrasound transducers

Content Provider	IEEE Xplore Digital Library
Author	Brown, L.F. Carlson, R.L. Sempsrott, J.M.
Copyright Year	1997
Description	Author affiliation: Dept. of Electr. Eng., South Dakota State Univ., Brookings, SD, USA (Brown, L.F.)
Abstract	Ferroelectric polymers are used in many special medical and industrial ultrasonic transducer applications. In most of these applications a free-standing metallized (i.e., patterned) film is adhered to a substrate material which is either reflective (i.e., high acoustic impedance) or acoustically matched in impedance but highly lossy. The adhesive layer can have adverse effects on ultrasonic transducer performance, especially at high frequencies. This work focussed on the direct formation of high performance ferroelectric copolymer films onto substrate materials suitable for fabricating medical ultrasound transducers. P(VDF-TrFE) copolymer resin was dissolved into methylethyl-ketone and subsequently spin-coated onto various ultrasound transducer substrate materials. After deposition, the 6-25 /spl mu/m thick films were cured, crystallized and poled on the substrates at fields of 100-120 V//spl mu/m. Several AC and DC poling techniques were used. The films were then characterized for their high frequency properties of interest for medical ultrasound, including their clamped dielectric properties, electromechanical coupling coefficient (k/sub t/), and mechanical quality factor (Q/sub m/). The results yielded k/sub t/ values as high as 0.30 and Q/sub m/ values in excess of 24. Ultrasonic tests confirmed that high performance broadband ultrasound transducers can be fabricated with ferroelectric polymers without the need for adhesive layers.
Starting Page	1725
Ending Page	1727
File Size	196174
Page Count	3
File Format	PDF
ISBN	0780341538
ISSN	10510117
DOI	10.1109/ULTSYM.1997.663344
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-10-05
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ultrasonic imaging Ferroelectric materials Ultrasonic transducers Ferroelectric films Optical films Dielectric substrates Polymers Impedance Frequency Crystalline materials
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in