Flexible and self-powered blinking and eyeball movements sensing based on electrospun lead-free piezoelectric nanofibers
Potassium sodium niobate(KNN)-based na-nofibers could combine piezoelectric properties with excep-tional flexibility and biocompatibility,making them highly promising for flexible sensors in electronic skin and wearable applications.However,the suboptimal piezoelectric perfor-mance limits their sensitivity in detecting minute human body motions,such as blinking and eye movements.Herein,Li and Ta-doped KNN nanofibers were fabricated via an electro-spinning process.Co-doping with 6%Li at the A-site and 30%Ta at the B-site induces lattice distortion and an orthorhombic(O)to tetragonal(T)phase transition in the electrospun na-nofibers,resulting in a significantly enhanced piezoelectric response,with an average d33*value reaching 110.7 pm/V.The outstanding piezoelectric response gives rise to a remarkable sensitivity(0.3365 V/(N cm2))in a self-powered flexible pres-sure sensor based on the doped KNN nanofibers,encapsulated in a polydimethylsiloxane matrix.The sensors,when attached to the temple regions,can detect tiny facial motions induced by blinking,enabling the distinction of abnormal blinking patterns associated with mental fatigue and excessive eye use.Additionally,they support real-time,continuous,and un-obtrusive eyeball tracking,highlighting their potential as cri-tical components in human-computer interaction and artificial intelligence applications.
flexible sensorseye movement sensingpiezoelectric nanofiberspotassium sodium niobateelectrospinning
姜蕾、梅旭、邵婷婷、杨欣然、龙午阳、万美琳、范怡静、熊娟、张翔晖、胡永明、顾豪爽、王钊
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Hubei Key Laboratory of Micro & Nano Electric Materials and Devices,School of Microelectronics,Hubei University,Wuhan 430062,China
Key Laboratory of Intelligent Sensing System and Security,Ministry of Education,Hubei University,Wuhan 430062,China
School of Chemistry and Environmental Engineering,Wuhan University of Bioengineering,Wuhan 430415,China