Tsinghua News Network, July 31st, July 24th, Professor Tian Tianling from the Micro-Nano Electronics Department published a book entitled "Multilayer Graphene Epidermal Electronic Skin" in the famous nano-scientific journal "ACS Nano" (" Multilayer Graphene Epidermal Electronic Skin") research paper. The device realizes customizable graphene electronic tattoo, which has high sensitivity and can be directly attached to the skin for detecting multiple functions such as breathing, heart rate and vocalization. In the future, it has motion monitoring, sleep monitoring, biomedical and so on. Major application prospects.
Figure 1. Customized graphene tattoos attached to the surface of the human body and objects
Electronic skin is an important biomedical sensor that requires good flexibility and scalability, high sensitivity, good fit and comfort. Graphene is an ideal material for electronic skin due to its excellent electrical conductivity and flexibility. However, it is still an urgent problem to collect graphene more comfortable, beautiful, stable and reliable on the surface of the skin.
Professor Ren Tianling's team based on laser-reduced graphene combines graphene with tattoos to mimic the function of electronic skin. Small deformations of the skin surface can be monitored by changes in electrical resistance. In the process of graphics, the team pioneered a new process of wet stripping graphene oxide in the world, removing graphene oxide and leaving only graphene, making the device more beautiful, more sensitive and resistant to higher temperatures. The technology uses a water transfer process, the substrate is ultra-thin, and there is no discomfort. In addition, due to the advantages of laser direct write programmable, the pattern of graphene can be personalized. In addition to measuring the stretching and compression of the skin surface, this graphene tattoo can also be transferred to a variety of substrates using a sacrificial layer process, such as leaves, silk, and the like. The measurement of body signals such as breathing, heartbeat, and voice is performed by attaching to a plurality of positions such as a mask, a wrist, a throat, and a person. The tester does not affect normal activities when worn. The potential of the device in various aspects such as sleep breathing, voice, etc., if popular in the future, allows people to understand their physical condition anytime, anywhere.
Figure 2. The stripping process can greatly increase the sensitivity of the sensor to facilitate the measurement of various physiological signals.
Through the observation and analysis of the laser direct writing graphene onlookers, Professor Ren Tianling established a theoretical model of cracks based on graphene strips, which better simulates the stress-induced resistance change process. In recent years, Professor Ren Tianling has devoted himself to the basic research and practical application of graphene devices, especially focusing on the research of new micro-nano electronic devices that break through the limitations of traditional devices, and has gained more in new graphene acoustic devices and various types of sensor devices. Innovations such as flexible graphene sounding devices, novel graphene resistive memories, spectrally tunable graphene light-emitting devices, graphene biomimetic synapses, tunable graphene stress sensors, biomimetic graphene pressure sensors, and extremely low power A number of papers on the consumption of graphene perovskite resistive memory, etc., published in Nature Communications, Advanced Materials, Nano Letters, American Chemical Society Nano ( Internationally renowned journals such as ACS Nano).
Qiao Yancong, a doctoral student of Micro-Nano Electronics, is the co-first author of the article. Professor Ren Tianling and his team teacher of the Micro-Nano Electronics Department are the authors of the paper. The research results are supported by the National Natural Science Foundation's key projects and the Ministry of Science and Technology.
Paper link:
Https://pubs.acs.org/doi/10.1021/acsnano.8b02162
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