Highly Transparent and Flexible Iontronic Pressure Sensors Based on an Opaque to Transparent Transition

Advanced Science

Chenggao Li¹  Jin Zhang¹  Zhiguang Liu²  Biqi Shao²  Jianming Zhang²  Chuan Fei Guo²  Pang Zhu²  Kewei Xie²  Junlong Yang²  Qingxian Liu²  Quan Wang³ 

[1] Department of Computer Science and Engineering Southern University of Science and Technology Shenzhen 518055 China;Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen 518055 China;Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Shenzhen 518055 China;

关键词: electric double layers;    flexible pressure sensors;    refractive index;    smart windows;    transparent bands;    transparent pressure sensors;   

DOI  :  10.1002/advs.202000348

来源: DOAJ

【 摘 要 】

Abstract Human–computer interfaces, smart glasses, touch screens, and some electronic skins require highly transparent and flexible pressure‐sensing elements. Flexible pressure sensors often apply a microstructured or porous active material to improve their sensitivity and response speed. However, the microstructures or small pores will result in high haze and low transparency of the device, and thus it is challenging to balance the sensitivity and transparency simultaneously in flexible pressure sensors or electronic skins. Here, for a capacitive‐type sensor that consists of a porous polyvinylidene fluoride (PVDF) film sandwiched between two transparent electrodes, the challenge is addressed by filling the pores with ionic liquid that has the same refractive index with PVDF, and the transmittance of the film dramatically boosts from 0 to 94.8% in the visible range. Apart from optical matching, the ionic liquid also significantly improves the signal intensity as well as the sensitivity due to the formation of an electric double layer at the dielectric‐electrode interfaces, and improves the toughness and stretchability of the active material benefiting from a plasticization effect. Such transparent and flexible sensors will be useful in smart windows, invisible bands, and so forth.

【 授权许可】

Unknown