Skin Controlled Electronic and Neuromorphic Tattoos

作     者：Kireev, Dmitry Koripally, Nandu Liu, Samuel Fleming, Gabriella Coloyan Varkey, Philip Belle, Joseph Mohan, Sivasakthya Han, Sang Sub Xu, Dong Jung, Yeonwoong Duan, Xiangfeng Incorvia, Jean Anne C. Akinwande, Deji 

作者机构：Chandra Department of Electrical and Computer Engineering The University of Texas at Austin AustinTX United States Department of Biomedical Engineering University of Massachusetts Amherst AmherstMA United States Department of Electrical and Computer Engineering University of California San Diego La Jolla CA United States Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX United States Department of Materials Science and Engineering The University of Texas at Austin AustinTX United States Texas Materials Institute The University of Texas at Austin AustinTX United States NanoScience Technology Center University of Central Florida OrlandoFL United States Department of Materials Science and Engineering University of California Los Angeles Los AngelesCA United States Department of Materials Science and Engineering University of Central Florida OrlandoFL United States Department of Chemistry and Biochemistry University of California Los Angeles Los AngelesCA United States California NanoSystems Institute University of California Los Angeles Los AngelesCA United States Department of Biomedical Engineering The University of Texas at Austin AustinTX United States 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2024年

核心收录：

主　　题：Semiconducting films 

摘      要：Wearable human activity sensors developed in the past decade show a distinct trend of becoming thinner and more imperceptible while retaining their electrical qualities, with graphene e-tattoos, as the ultimate example. A persistent challenge in modern wearables, however, is signal degradation due to the distance between the sensor s recording site and the signal transmission medium. To address this, we propose here to directly utilize human skin as a signal transmission medium as well as using low-cost gel electrodes for rapid probing of 2D transistor-based wearables. We demonstrate that the hypodermis layer of the skin can effectively serve as an electrolyte, enabling electrical potential application to semiconducting films made from graphene and other 2D materials placed on top of the skin. Graphene transistor tattoos, when biased through the body, exhibit high charge carrier mobility (up to 6500 cm2V-1s-1) with MoS2 and PtSe2 transistors showing mobilities up to 30 cm2V-1s-1 and 1 cm2V-1s-1 respectively. Finally, by introducing a layer of Nafion to the device structure, we observed neuromorphic functionality, transforming these e-tattoos into neuromorphic bioelectronic devices controlled through the skin itself. The neuromorphic bioelectronic tattoos have the potential for developing self-aware and stand-alone smart wearables, crucial for understanding and improving overall human performance. © 2024, CC BY.