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Piezoelectric polymer thin films with architected cuts

Published online by Cambridge University Press:  14 February 2018

Lichen Fang
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA; and Hopkins Extreme Materials Institute, Johns Hopkins University, Baltimore, Maryland 21218, USA
Jing Li
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA; Hopkins Extreme Materials Institute, Johns Hopkins University, Baltimore, Maryland 21218, USA; and Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, Hubei 430070, China
Zeyu Zhu
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA; and Hopkins Extreme Materials Institute, Johns Hopkins University, Baltimore, Maryland 21218, USA
Santiago Orrego
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA; and Hopkins Extreme Materials Institute, Johns Hopkins University, Baltimore, Maryland 21218, USA
Sung Hoon Kang*
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA; and Hopkins Extreme Materials Institute, Johns Hopkins University, Baltimore, Maryland 21218, USA
*
a) Address all correspondence to this author. e-mail: shkang@jhu.edu
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Abstract

Introducing architected cuts is an attractive and simple approach to tune mechanical behaviors of planar materials like thin films for desirable or enhanced mechanical performance. However, little has been studied on the effects of architected cuts on functional materials like piezoelectric materials. We investigated how architected cut patterns affect mechanical and piezoelectric properties of polyvinylidene fluoride thin films by numerical, experimental, and analytical studies. Our results show that thin films with architected cuts can provide desired mechanical features like enhanced compliance, stretchability, and controllable Poisson’s ratio and resonance frequency, while maintaining piezoelectric performance under static loadings. Moreover, we could observe maximum ∼30% improvement in piezoelectric conversion efficiency under dynamic loadings and harvest energy from low frequency (<100 Hz) mechanical signals or low velocity (<5 m/s) winds, which are commonly existing in ambient environment. Using architected cuts doesn't require changing the material or overall dimensions, making it attractive for applications in self-powered devices with design constraints.

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Type
Invited Articles
Copyright
Copyright © Materials Research Society 2018 

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