With the rapid development of internet of things,self-powered touch sensors made of piezoelectric fluorinated polymers have attracted significant interest because they can constantly convert mechanical energy into electrical energy without external power supply.However,it is still challenging to fabricate fluorinated polymer films with good adhesion and high output performance with a Iarge-scale and low-cost method while maintaining high transparency,which are extremely important for simultaneous optical detection and electromechanical transduction.In this work,we demonstrate that the incorporation of a molecular ferroelectric-dabcoHReO4(DH)into poly(vinylidene difluoride)(PVDF)solution enables high-throughput and Iow-temperature processing of flexible and transparent piezoelectric films by scalable processing method.The effects of multiaxial DH are multiple.First,DH can trigger the phase transition of PVDF from a-to β-phase and realize the orderly orientation of PVDF,which guarantees higher piezoelectric performance without any additional electrical poling process.Second,the hydrophilic nature of DH can improve the adhesion properties of PVDF,which in turn improve the stability and durability of the devices.By optimizing the fabrication processes,the transmittance of the piezoelectric touch sensors based on PVDF films and Ag nanowires coated poly(ethylene terephthalate)electrodes can be higher than 94％.The piezoelectric voltage constant g33 of the transparent films can reach to 1.2 V·m·N-1,which is at least three times higher than the commercially available PVDF films obtained by stretching.These results indicate that the flexible piezoelectric sensors have potential applications in transparent electronic devices for mechanical sensing and energy harvesting.

Qing-Qing Li;Guang-Kuo Wang;Zi-Xu Liang;Zhi-Jun Hu

School of Optoelectronic Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology,Soochow University,Suzhou 215006,China;Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of China,Soochow University,Suzhou 215006,China;Center for Soft Condensed Matter Physics and Interdisciplinary Research,Soochow University,Suzhou 215006,China

高分子科学（英文版）

[1]Qing-Qing Li;Guang-Kuo Wang;Zi-Xu Liang;Zhi-Jun Hu-.Highly Transparent and Adhesive Poly(vinylidene difluoride)Films for Self-Powered Piezoelectric Touch Sensors)[J].高分子科学（英文版）,2022(07):726-737

Iarge,dabcoHReO4,Iow

Highly,Transparent,Adhesive,Poly,vinylidene,difluoride,Films,Self,Powered,Piezoelectric,Touch,Sensors,With,rapid,development,internet,things,self,powered,touch,sensors,made,piezoelectric,fluorinated,polymers,have,attracted,significant,interest,because,they,constantly,convert,energy,into,electrical,without,external,supply,However,still,challenging,fabricate,films,good,adhesion,output,performance,scale,low,cost,method,while,maintaining,transparency,which,extremely,important,simultaneous,optical,detection,electromechanical,transduction,In,this,work,demonstrate,that,incorporation,molecular,ferroelectric,DH,PVDF,solution,enables,throughput,temperature,processing,flexible,transparent,by,scalable,effects,multiaxial,multiple,First,trigger,phase,transition,from,realize,orderly,orientation,guarantees,higher,any,additional,poling,Second,hydrophilic,nature,improve,properties,turn,stability,durability,devices,By,optimizing,fabrication,processes,transmittance,Ag,nanowires,coated,ethylene,terephthalate,electrodes,than,voltage,g33,reach,least,three,times,commercially,available,obtained,stretching,These,results,indicate,potential,applications,electronic,sensing,harvesting

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