title: Transparent and Flexible Self-Charging Power Film and Its Application in a Sliding Unlock System in Touchpad Technology.
abstract: Portable and wearable personal electronics and smart security systems are accelerating the development of transparent, flexible, and thin-film electronic devices. Here, we report a transparent and flexible self-charging power film (SCPF) that functions either as a power generator integrated with an energy storage unit or as a self-powered information input matrix. The SCPF possesses the capability of harvesting mechanical energy from finger motions, based on the coupling between the contact electrification and electrostatic induction effects, and meanwhile storing the generated energy. Under the fast finger sliding, the film can be charged from 0 to 2.5 V within 2094 s and discharge at 1 μA for approximately 1630 s. Furthermore, the film is able to identify personal characteristics during a sliding motion by recording the electric signals related to the person's individual bioelectricity, applied pressing force, sliding speed, and so on, which shows its potential applications in security systems in touchpad technology.
authors: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences , National Center for Nanoscience and Technology (NCNST), Beijing 100083, China.
authors: Jianjun
authors: J
authors: Luo
authors: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences , National Center for Nanoscience and Technology (NCNST), Beijing 100083, China.
authors: Wei
authors: W
authors: Tang
authors: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences , National Center for Nanoscience and Technology (NCNST), Beijing 100083, China.
authors: Feng Ru
authors: FR
authors: Fan
authors: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences , National Center for Nanoscience and Technology (NCNST), Beijing 100083, China.
authors: Chaofeng
authors: C
authors: Liu
authors: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences , National Center for Nanoscience and Technology (NCNST), Beijing 100083, China.
authors: Yaokun
authors: Y
authors: Pang
authors: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences , National Center for Nanoscience and Technology (NCNST), Beijing 100083, China.|Department of Materials Science and Engineering, University of Washington , Seattle, Washington 98195, United States.
authors: Guozhong
authors: G
authors: Cao
authors: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences , National Center for Nanoscience and Technology (NCNST), Beijing 100083, China.|School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States.
authors: Zhong Lin
authors: ZL
authors: Wang
keywords: biometrics; energy harvesting; energy storage; self-charging; transparent and flexible