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Piezoelectricity of a Ferrocene-based Organic Small Molecule

preprint
submitted on 23.11.2020, 04:08 and posted on 24.11.2020, 07:45 by Xing Feng, Ling Li, Jianyu Zhang, Xiaohui Wang, Qingsong Wang, Wei Gao, Carl Redshaw, Nengjie Huo, Jingbo Li, Jacky W. Y. Lam, Ben Zhong Tang
Non-centrosymmetric crystals with piezoelectric properties have emerged as promising materials for smart wearable systems and biomimetic robots. Here we present a novel small ferrocene-based organic molecule crystal (Fc-Cz) possessing high anisotropic-dependent optical and electronic properties, which has been utilized as an ultrasensitive piezoelectric material for the development of a strain sensor. The flexible piezoelectric sensor can distinguish subtle strain or deformations (such as wrist motion) with fast response time (< 40 ms) via detectable piezoelectric signals (Imax = 580 pA). Density functional theory (DFT) indicated that the external pressure can affect the dipole moment by changing the molecular configuration of the asymmetric single crystal Fc-Cz in the crystalline state, leading to a change of polarity, as well as an enhanced dielectric constant. Based on our knowledge, this work is the first example verifying that artificial organic small molecules can serve as simple, stable, high-performance tactile sensors, and this has the potential to open the door to low-cost flexible wearable devices and energy harvesting applications.

Funding

National Natural Science Foundation of China

History

Email Address of Submitting Author

hyxhn@sina.com

Institution

Guangdong University of Technology

Country

P. R. China

ORCID For Submitting Author

0000-0002-4273-979X

Declaration of Conflict of Interest

There are no conflicts to declare.

Version Notes

the first version

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