Mr. Xi Chen Profile

Xi Chen

PhD Candidate at Stevens Institute of Technology

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Proceedings Article | 14 April 2011 Paper

A PZT nanofiber composites sensor for structure health monitoring

Xi Chen, Yong Shi

Proceedings Volume 7981, 798135 (2011) https://doi.org/10.1117/12.881819

KEYWORDS: Ferroelectric materials, Nanofibers, Sensors, Electrodes, Composites, Silicon, Polymers, Acoustic emission, Semiconducting wafers, Epoxies

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A nanoscale active fiber composites (NAFCs) based acoustic emission (AE) sensor with high sensitivity is developed. The lead zirconate titanate (PZT) nanofibers, with the diameter of approximately 80 nm, were electrospun on a silicon substrate. Nanofibers were parallel aligned on the substrate under a controlled electric field. The interdigitated electrodes were deposited on the PZT nanofibers and packaged by spinning a thin soft polymer layer on the top of the sensor. The hysteresis loop shows a typical ferroelectric property of as-spun PZT nanofibers. The mathematical model of the voltage generation when the elastic waves were reaching to sensor was studied. The sensor was tested by mounting on a steel surface and the measured output voltage under the periodic impact of a grounded steel bar was over 35 mV. The small size of the developed PZT NAFCs AE sensor shows a promising application in monitoring the structures by integrated into composites.

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