Superior piezoelectric composite films : taking advantage of carbon nanomaterials

Saber, Nasser, Araby, Sherif, Meng, Qingshi, Hsu, Hung-Yao, Yan, Cheng, Azari, Sara, Lee, Sang-Heon, Xu, Yanan, & Ma, Jun (2013) Superior piezoelectric composite films : taking advantage of carbon nanomaterials. Nanotechnology, 25(4), 045501.

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Abstract

Piezoelectric composites comprising an active phase of ferroelectric ceramic and a polymer matrix have recently attracted numerous sensory applications. However, it remains a major challenge to further improve their electromechanical response for advanced applications such as precision control and monitoring systems. We hereby investigated the incorporation of graphene platelets (GnPs) and multi-walled carbon nanotubes (MWNTs), each with various weight fractions, into PZT (lead zirconate titanate)/epoxy composites to produce three-phase nanocomposites. The nanocomposite films show markedly improved piezoelectric coefficients and electromechanical responses (50%) besides an enhancement of ~200% in stiffness. Carbon nanomaterials strengthened the impact of electric field on the PZT particles by appropriately raising the electrical conductivity of epoxy. GnPs have been proved far more promising in improving the poling behavior and dynamic response than MWNTs. The superior dynamic sensitivity of GnP-reinforced composite may be caused by GnPs’ high load transfer efficiency arising from their two-dimensional geometry and good compatibility with the matrix. Reduced acoustic impedance mismatch resulted from the improved thermal conductance may also contribute to the higher sensitivity of GnP-reinforced composite. This research pointed out the potential of employing GnPs to develop highly sensitive piezoelectric composites for sensing applications.

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1 citations in Web of Science®

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ID Code: 64731
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: Piezoelectric composites, Sensor, Graphene platelets, Multi-walled carbon nanotubes, Poling
DOI: 10.1088/0957-4484/25/4/045501
ISSN: 1361-6528
Subjects: Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > NANOTECHNOLOGY (100700)
Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > NANOTECHNOLOGY (100700) > Nanomaterials (100708)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Funding:
Copyright Owner: 2014 IOP Publishing Ltd
Deposited On: 24 Nov 2013 23:08
Last Modified: 26 Jun 2015 03:32

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