Stretchable piezoelectric biocrystal thin films

Jun Li, Corey Carlos, Hao Zhou, Jiajie Sui, Yikai Wang, Zulmari Silva-Pedraza, Fan Yang, Yutao Dong, Ziyi Zhang, Timothy A. Hacker, Bo Liu, Yanchao Mao () and Xudong Wang ()
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Jun Li: University of Wisconsin-Madison
Corey Carlos: University of Wisconsin-Madison
Hao Zhou: Zhengzhou University
Jiajie Sui: University of Wisconsin-Madison
Yikai Wang: University of Wisconsin-Madison
Zulmari Silva-Pedraza: University of Wisconsin-Madison
Fan Yang: Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai
Yutao Dong: University of Wisconsin-Madison
Ziyi Zhang: University of Wisconsin-Madison
Timothy A. Hacker: University of Wisconsin–Madison
Bo Liu: University of Wisconsin-Madison
Yanchao Mao: Zhengzhou University
Xudong Wang: University of Wisconsin-Madison

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Stretchability is an essential property for wearable devices to match varying strains when interfacing with soft tissues or organs. While piezoelectricity has broad application potentials as tactile sensors, artificial skins, or nanogenerators, enabling tissue-comparable stretchability is a main roadblock due to the intrinsic rigidity and hardness of the crystalline phase. Here, an amino acid-based piezoelectric biocrystal thin film that offers tissue-compatible omnidirectional stretchability with unimpaired piezoelectricity is reported. The stretchability was enabled by a truss-like microstructure that was self-assembled under controlled molecule-solvent interaction and interface tension. Through the open and close of truss meshes, this large scale biocrystal microstructure was able to endure up to 40% tensile strain along different directions while retained both structural integrity and piezoelectric performance. Built on this structure, a tissue-compatible stretchable piezoelectric nanogenerator was developed, which could conform to various tissue surfaces, and exhibited stable functions under multidimensional large strains. In this work, we presented a promising solution that integrates piezoelectricity, stretchability and biocompatibility in one material system, a critical step toward tissue-compatible biomedical devices.

Date: 2023
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DOI: 10.1038/s41467-023-42184-8

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