Title :
PZT/P(VDF-TrFE) nanocomposites for ultrasonic hydrophone application
Author :
Lau, S.T. ; Zhou, Q.F. ; Kwok, K.W. ; Chan, H.L.W. ; Choy, C.L.
Author_Institution :
Dept. of Appl. Phys., Hong Kong Polytech., Kowloon, China
Abstract :
0-3 composites with nanosized lead zirconate titanate (PZT) powder imbedded in a vinylidene fluoride-trifluoroethylene copolymer (P(VDF-TrFE)) matrix have been fabricated. Since the piezoelectric coefficients of PZT and P(VDF-TrFE) have opposite signs, the PZT and P(VDF-TrFE) phases in the nanocomposites were poled in opposite directions in order to enhance the piezoelectric activity. The PZT powder, prepared by a sol-gel process, has a tetragonal structure. The ratio of the (002) and (200) X-ray diffraction peaks was used as a measure of the degree of poling in the ceramic phase. The piezoelectric coefficient of the nanocomposite film was measured by a laser interferometry technique. A needle type hydrophone for the calibration of medical ultrasonic transducers was fabricated using the nanocomposite as the sensing element and its performance was evaluated
Keywords :
biomedical transducers; biomedical ultrasonics; filled polymers; hydrophones; lead compounds; nanostructured materials; piezoceramics; piezoelectric transducers; polymer blends; ultrasonic transducers; PZT; PZT/P(VDF-TrFE) nanocomposites; PbZrO3TiO3; X-ray diffraction; ceramic phase; copolymer matrix; laser interferometry; medical ultrasonic transducer calibration; needle type hydrophone; piezoelectric coefficients; poling; sol-gel process; tetragonal structure; ultrasonic hydrophone; Bioceramics; Nanocomposites; Phase measurement; Piezoelectric films; Powders; Sonar equipment; Titanium compounds; Ultrasonic variables measurement; X-ray diffraction; X-ray lasers;
Conference_Titel :
Electrets, 1999. ISE 10. Proceedings. 10th International Symposium on
Conference_Location :
Athens
Print_ISBN :
0-7803-5025-1
DOI :
10.1109/ISE.1999.832154
