Sandwich-structured Co 3 [Co(CN) 6 ] 2 /P(VDF-HFP) piezoelectric composites with superior electromechanical activity
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Sandwich-structured Co3[Co(CN)6]2/P(VDF-HFP) piezoelectric composites with superior electromechanical activity Qirui Peng1, Lu Yang2,3,*, Qiuying Zhao1, Yizhou Ma1, Hongli Ji1,4, and Jinhao Qiu1,4,*
1
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 2 Nantong Ocean Research and Offshore Engineering Institute of Hohai University, Nantong 226300, China 3 College of Mechanics and Materials, Hohai University, Nanjing 210098, China 4 College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Received: 24 June 2020
ABSTRACT
Accepted: 17 October 2020
The development of piezoelectric polymers with superior electromechanical performance is a demand in the areas of flexible sensors, actuators and tissue engineering, among others. In this work, we reported a novel sandwich-structured piezoelectric composites comprising of poly(vinylidene fluoride-hexafluoropropylene) [P(VDF-HFP)] and Prussian blue analogs Co3[Co(CN)6]2 with excellent electromechanical activities. The large specific surface area, unique three-dimensional porous nanostructure and redox behavior of Co3[Co(CN)6]2 appeared to significantly promote the interfacial coupling effect within P(VDFHFP), resulting in enhanced electromechanical response. Moreover, the sandwich structure topological design would enlarge the interfacial coupling effect, strengthen the breakdown strength and consequently raise the electromechanical performance. For instance, a maximum piezoelectric coefficient d33 of * 41 pC/N can be achieved in the sandwiched composites at a loading of 0.8 wt%, which is 1.78 times that of pure P(VDF-HFP). Furthermore, the sandwiched composites possess superior electromechanical coupling factor k33 up to 0.215, while that of pure P(VDF-HFP) is only 0.134.
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Springer Science+Business
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1 Introduction With the excellent ferro-, piezo- and pyroelectric properties, polyvinylidene fluoride (PVDF) and its associated copolymers are eagerly desirable for a
broad range of modern electronics such as nonvolatile memories, transducers, sensors and nanogenerators as energy harvesting devices [1–6]. Particularly, the PVDF copolymers represented by poly(vinylidene fluoride-co-hexafluoropropene)
Address correspondence to E-mail: yanglu90@hhu.edu.cn; qiu@nuaa.edu.cn
https://doi.org/10.1007/s10854-020-04704-w
J Mater Sci: Mater Electron
[P(VDF-HFP)] stand out for their superior electromechanical response, permitting new possibilities in developing advanced electronics mentioned above [7–9]. For instance, the reported electromechanical coupling factor k33 of P(VDF-HFP) can be almost double that of PVDF, suggesting its capability in conversing energy efficiently [10]. Furthermore, compared with PVDF which possess repeated –[CF2– CH2]- units, the presence of bulky CF3 groups in P(VDF-HFP) endows it with better charge-trapping properties, leading to additional stabilization of orient
