Transparent, stretchable imitation skin friction nano-generator developed successfully

In recent years, the rapid development of flexible / stretchable electronic products has been accompanied by the emergence of a large number of revolutionary functional products such as flexible transistors / integrated circuits, stretchable optoelectronic devices, foldable displays and electronic skins. These products put forward higher requirements on their energy supply equipment, hoping it has considerable flexibility and extensibility. However, few energy devices can simultaneously achieve flexibility, high transparency and stretchability. In addition, the growing market for wearable electronics and implantable electronics requires that their energy-providing devices, in addition to their flexibility and stretchability, also require good biocompatibility.

Conventional electromagnetic generators are difficult to achieve stretchable, and the recent rapid development of triboelectric nanogenerators (TENGs) meets the above requirements for flexible electronic equipment. Recently reported stretchable friction nano-generator is mainly using carbon nanotubes, graphene, silver nanowires and other conductive network enhanced elastomeric polymers. However, the stretchability of such a material is limited and it is difficult to achieve high light transmittance. In contrast, hydrogels composed of a hydrophilic polymer network and aqueous or ionic aqueous solutions, which are transparent, flexible, biocompatible and stretchable, are ideal materials for the development of flexible triboelectric nano-generators.

Under the joint guidance of Wang Zhonglin and Hu Weiguo from Beijing Institute of Nano-Energy and System Sciences, Chinese Academy of Sciences, researchers such as Po-hsiung and other scientists in Beijing's Nano Energy Institute combined elastomer and ionic hydrogel to develop a new type of imitation skin-like nano Friction Generator (STENG), for the first time with high transparency (average light transmittance, 96.2% of visible light) and high stretchability (uniaxial strain, 1160%), as well as biomechanical energy harvesting, haptic sensing And other functions. This work provides a completely new perspective on the study of transparent, stretchable energy devices and flexible electronic skin, and the findings are published in the recent Science Advances,

This STENG produces an open circuit voltage of up to 145 volts with an instantaneous power density of 35 milliwatts / square meter. STENG has broad market prospects. Due to its biocompatible hydrogel material, it can directly adhere to human skin and drive many wearable electronic products such as LED and electronic watch. The study for the first time proposed a highly stretchable and transparent STENG, because of high transparency does not interfere with the transmission of optical information, both energy harvesting and touch sensing, intelligent artificial skin, self-driven soft robots, Flexible displays and wearable electronics have potential applications.

Figure: Structure diagram of transparent and stretchable STENG (a), physical photograph (b) and STENG array type electronic skin with tactile sensation (c)

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