Flexible and Transparent Ionic Liquids/Poly(vinylidene fluoride) Composition‐Gradient Piezo‐Active Composites for Highly Sensitive Pressure Sensor. (17th November 2022)

• Record Type: Journal Article
• Authors: Bao, Hao; Ma, Yizhou; Sun, Jiatai; Zhao, Qiuying; Yang, Lu; Hou, Ying; He, Haiyan; Huang, Huajie; Ji, Hongli; Qiu, Jinhao
• Is Part Of: Advanced Electronic Materials. Volume 9:Number 2(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-11-17
• Subjects: composition gradient -- ionic liquids -- piezoelectric -- poly(vinylidene fluoride) (PVDF) -- sensors; Materials -- Electric properties -- Periodicals; Materials science -- Periodicals; Magnetic materials -- Periodicals; Electronic apparatus and appliances -- Periodicals; 537
• DOI: 10.1002/aelm.202201013
• Languages: English
• ISSNs: 2199-160X

Abstract

Abstract: Nowadays, the advent of pressure sensors for intelligence terminal devices and skin‐inspired electronics has trigged rapid development of flexible, sensitive, and transparent sensing materials. Piezo‐active poly(vinylidene fluoride) (PVDF) is emerging as a promising candidate for sensing components due to the flexible and transparent features. However, the inherent weak piezo‐activity and consequently low sensitivity of PVDF remains a challenge for its sensing applications. Herein, ionic liquids ([EMIM]Cl) additive combined with a composition‐gradient multilayered architecture design are employed to hardness the piezo‐response of PVDF. The resultant composites present ultra‐high piezoelectric coefficient d 33 of 39 pC N −1, which is 2.78 times that of PVDF. Meanwhile, the transparent ILs dopant enables the composites with superior transparency (87%). With notable advantages of high transparency and piezoelectricity, the ILs/PVDF composites exhibit high sensitivity of 0.0423 V N −1, ultra‐fast recovery time of 0.2 ms and stable operation capability when coupled with metal electrodes, confirming their applicability for reliable pressure sensor. Abstract : Here, flexible and transparent poly(vinylidene fluoride) based piezo‐active composites are successfully fabricated using ionic liquid dopants and composition‐gradient structural engineering. The newly developed composites exhibit outstanding piezoelectricity, demonstrating high feasibility in constructing sensitive and reliable pressure sensors.