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Chinese Academy of Sciences successfully developed a new imitation skin type nano friction generator
[Research and Development of China Instrument Network Instrumentation] In recent years, with the emergence of various revolutionary functional products such as flexible transistors/integrated circuits, stretchable photovoltaic devices, foldable displays, and electronic skin, flexible/stretchable electronic products have been made available. Rapid development.
These products put forward higher requirements for their energy-supplying devices, and they hope that they have considerable flexibility and stretchability. However, few energy devices can simultaneously achieve flexibility, high transparency, and stretchability. In addition, the growing market for wearable electronics and implantable electronic products requires that their energy supply devices, in addition to flexibility and stretchability, also need to have good biocompatibility at the same time.
Conventional electromagnetic generators are difficult to achieve stretchability, while the recent rapid development of friction nanogenerators (TENG) can meet the above requirements of flexible electronic devices. The recently reported stretchable friction nano-generators mainly use carbon nanotubes, graphene, silver nanowires and other conductive network-enhanced elastomer polymers. However, the stretchability of this material is limited and it is difficult to achieve high transparency. In contrast, hydrogels composed of a hydrophilic polymer network and aqueous or ionic aqueous solutions can simultaneously achieve transparency, softness, biocompatibility, and tensile properties, and are ideal materials for the development of flexible friction nanogenerators.
Under the joint guidance of academician Wang Zhonglin and researcher Hu Weiguo of the Beijing Institute of Nano Energy and Systems, Chinese Academy of Sciences, researchers from Beijing Nano Energy and Systems Research Institute, Pu Xiong, combined the elastomer and ionized hydrogel to develop a new Imitation skin-type nano-friction generator (STENG), the device for the first time to achieve both high transparency (average light transmittance, visible light 96.2%) and ultra-high stretchability (uniaxial strain, 1160%), while enabling biomechanical energy Collection, tactile perception and other functions. This work provides a new perspective for the study of transparent, stretchable energy devices and flexible electronic skin. Research results were published in the recent "Science Advances" (DOI:10.1126/sciadv.1700015).
This STENG can generate open circuit voltages up to 145 volts with an instantaneous power density of 35 milliwatts per square meter. STENG has a broad market prospect. Because the material used is a biocompatible hydrogel, it can directly adhere to the human skin and drive many wearable electronic products such as LEDs and electronic watches. The study for the first time proposed a STENG with ultra-high stretchability and transparency, because the transparency is high without interfering with the transmission of optical information, and at the same time it has both energy collection and touch sensing, so in smart artificial skin, self-driven software robots, There are potential applications in flexible displays and wearable electronic devices.
Figure 1. Schematic view of the transparent, stretchable STENG (a), physical photo (b) and STENG arrayed electronic skin with tactile perception (c).
(Original Title: Transparent, Stretchable Friction Nano-Generator)