Piezoelectric nanocomposite sensors assembled using zinc oxide nanoparticles and poly(vinylidene fluoride)

Author(s): Dodds, JS; Meyers, FN; Loh, KJ | Abstract: Structural health monitoring (SHM) is vital for detecting the onset of damage and for preventing catastrophic failure of civil infrastructure systems. In particular, piezoelectric transducers have the ability to excite and actively interrogate structures (e.g., using surface waves) while measuring their response for sensing and damage detection. In fact, piezoelectric transducers such as lead zirconate titanate (PZT) and poly(vinylidene fluoride) (PVDF) have been used for various laboratory/field tests and possess significant advantages as compared to visual inspection and vibration-based methods, to name a few. However, PZTs are inherently brittle, and PVDF films do not possess high piezoelectricity, thereby limiting each of these devices to certain specific applications. The objective of this study is to design, characterize, and validate piezoelectric nanocomposites consisting of zinc oxide (ZnO) nanoparticles assembled in a PVDF copolymer matrix for sensing and SHM applications. These films provide greater mechanical flexibility as compared to PZTs, yet possess enhanced piezoelectricity as compared to pristine PVDF copolymers. This study started with spin coating dispersed ZnO- and PVDF-TrFE-based solutions to fabricate the piezoelectric nanocomposites. The concentration of ZnO nanoparticles was varied from 0 to 20 wt.% (in 5 % increments) to determine their influence on bulk film piezoelectricity. Second, their electric polarization responses were obtained for quantifying thin film remnant polarization, which is directly correlated to piezoelectricity. Based on these results, the films were poled (at 50 MV-m-1) to permanently align their electrical domains and to enhance their bulk film piezoelectricity. Then, a series of hammer impact tests were conducted, and the voltage generated by poled ZnO-based thin films was compared to commercially poled PVDF copolymer thin films. The hammer impact tests showed comparable results between the prototype and commercial samples, and increasing ZnO content provided enhanced piezoelectric performance. Lastly, the films were further validated for sensing using different energy levels of hammer impact, different distances between the impact locations and the film electrodes, and cantilever free vibration testing for dynamic strain sensing. Copyright © 2013 Techno-Press, Ltd.

[1]  Daniel J. Inman,et al.  Energy Harvesting for Autonomous Sensing , 2007 .

[2]  Zhong Lin Wang.  Zinc oxide nanostructures: growth, properties and applications , 2004 .

[3]  J. Rödel,et al.  Evolution of bias field and offset piezoelectric coefficient in bulk lead zirconate titanate with fatigue , 2005 .

[4]  Keith Worden,et al.  An introduction to structural health monitoring , 2007, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[5]  G. T. Davis,et al.  Plasma poling of poly(vinylidene fluoride): Piezo‐ and pyroelectric response , 1980 .

[6]  Youn Jung Park,et al.  Spin cast ferroelectric beta poly(vinylidene fluoride) thin films via rapid thermal annealing , 2008 .

[7]  Jerome P. Lynch,et al.  A summary review of wireless sensors and sensor networks for structural health monitoring , 2006 .

[8]  Surface strain distribution method for delamination detection using piezoelectric actuators and sensors , 2011 .

[9]  William Leiss.  Assessing and managing risks , 1992 .

[10]  Elasticity and piezoelectricity of zinc oxide crystals, single layers, and possible single-walled nanotubes , 2005, cond-mat/0511274.

[11]  M. Wegener,et al.  Piezoelectric PZT / PVDF-copolymer 0-3 composites: aspects on film preparation and electrical poling , 2010, IEEE Transactions on Dielectrics and Electrical Insulation.

[12]  D. Inman,et al.  A Review of Power Harvesting from Vibration using Piezoelectric Materials , 2004 .

[13]  M. Gaur,et al.  Thermally stimulated dielectric properties of polyvinylidenefluoride–zinc oxide nanocomposites , 2011 .

[14]  Hoon Sohn,et al.  Overview of Piezoelectric Impedance-Based Health Monitoring and Path Forward , 2003 .

[15]  Jay Landers.  New York City Begins Operating Largest Nitrogen Removal System of Its Kind , 2010 .

[16]  Robert L. Reid.  Damaged Eyebar Section Replaced On San Francisco– Oakland Bay Bridge , 2010 .

[17]  K. Loh,et al.  Zinc oxide nanoparticle-polymeric thin films for dynamic strain sensing , 2011 .

[18]  Charles R. Farrar,et al.  A summary review of vibration-based damage identification methods , 1998 .

[19]  E. Markiewicz,et al.  The method of matching resonance frequencies in coupled transmitter PVDF/TRFE diaphragms , 2000 .

[20]  Emmanuel Defay,et al.  Integration of ferroelectric and piezoelectric thin films : concepts and applications for microsystems , 2011 .

[21]  Maria Q. Feng,et al.  System identification of a building from multiple seismic records , 2011 .

[22]  Zhong Lin Wang,et al.  Self-powered nanowire devices. , 2010, Nature nanotechnology.

[23]  K. Ramachandran,et al.  Dielectric studies on hybridised PVDF–ZnO nanocomposites , 2011 .

[24]  Lawrence L. Sutter,et al.  The State-of-the-Practice of Modern Structural Health Monitoring for Bridges: A Comprehensive Review , 2010 .

[25]  A. Kersey.  A Review of Recent Developments in Fiber Optic Sensor Technology , 1996 .

[26]  John S. Dodds,et al.  Piezoelectric Characterization of PVDF-TrFE Thin Films Enhanced With ZnO Nanoparticles , 2012, IEEE Sensors Journal.

[27]  S. Beeby,et al.  Energy harvesting vibration sources for microsystems applications , 2006 .

[28]  H. Kawai,et al.  The Piezoelectricity of Poly (vinylidene Fluoride) , 1969 .

[29]  T. Greeshma,et al.  The Influence of Individual Phases on Piezoelectric Coefficient of PZT-PVdF Composites , 2009 .

[30]  Joseph L. Rose,et al.  Ultrasonic Guided Wave Annular Array Transducers for Structural Health Monitoring , 2006 .

[31]  David A. Horsley,et al.  Structural Health Monitoring of Glass/Epoxy Composite Plates Using PZT and PMN-PT Transducers , 2011 .

[32]  R. Nath,et al.  Ferroelectric hysteresis in simultaneously stretched and corona-poled PVDF films , 1997 .

[33]  Gyuhae Park,et al.  Development of an impedance-based wireless sensor node for structural health monitoring , 2007 .