Journal
SMALL
Volume 17, Issue 46, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202103125
Keywords
aggregation-induced emission; organic small molecules; piezoelectricity; polarizability; wearable devices
Categories
Funding
- National Natural Science Foundation of China [21975054]
- Natural Science Foundation of Guangdong Province of China [2019A1515010925]
- One Hundred Talents Program of the Guangdong University of Technology (GDUT) [1108-220413205]
- Guangdong Provincial Key Laboratory of Information Photonics Technology [2020B121201011]
- Pearl River Talent Recruitment Program [2019ZT08x639]
- Research Grants Council of Hong Kong [C6009-17G]
- Innovation of Technology Commission [ITC-CNERC14SC01]
- EPSRC [EP/R023816/1]
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The novel ferrocene-based organic molecule crystal Fc-Cz, as a strain sensor material, exhibits advantages such as fast response, high sensitivity, and versatility. Analysis based on density functional theory shows that external pressure can change the polarity and enhance the dielectric constant of crystal Fc-Cz.
Stimuli-responsive crystals capable of energy conversion have emerged as promising materials for smart sensors, actuators, wearable devices, and robotics. Here, a novel ferrocene-based organic molecule crystal (Fc-Cz) that possesses anisotropic piezoelectric, optical, and mechanical properties is reported. It is demonstrated that the new crystal Fc-Cz can be used as an ultrasensitive piezoelectric material in fabricating strain sensors. The flexible sensor made of crystal Fc-Cz can detect small strains/deformations and motions with a fast response speed. Analysis based on density functional theory (DFT) indicates that an 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, and thereby an enhanced dielectric constant. This work demonstrates a new artificial organic small molecule for high-performance tactile sensors, indicating its great potential for developing low-cost flexible wearable sensors.
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