Graphene e-tattoos for unobstructive ambulatory electrodermal activity sensing on the palm enabled by heterogeneous serpentine ribbons

Hongwoo Jang, Kaan Sel, Eunbin Kim, Sangjun Kim, Xiangxing Yang, Seungmin Kang, Kyoung-Ho Ha, Rebecca Wang, Yifan Rao, Roozbeh Jafari and Nanshu Lu ()
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Hongwoo Jang: The University of Texas at Austin
Kaan Sel: Department of Electrical and Computer Engineering at Texas A&M University
Eunbin Kim: The University of Texas at Austin
Sangjun Kim: The University of Texas at Austin
Xiangxing Yang: The University of Texas at Austin
Seungmin Kang: The University of Texas at Austin
Kyoung-Ho Ha: The University of Texas at Austin
Rebecca Wang: The University of Texas at Austin
Yifan Rao: The University of Texas at Austin
Roozbeh Jafari: Department of Electrical and Computer Engineering at Texas A&M University
Nanshu Lu: The University of Texas at Austin

Nature Communications, 2022, vol. 13, issue 1, 1-13

Abstract: Abstract Electrodermal activity (EDA) is a popular index of mental stress. State-of-the-art EDA sensors suffer from obstructiveness on the palm or low signal fidelity off the palm. Our previous invention of sub-micron-thin imperceptible graphene e-tattoos (GET) is ideal for unobstructive EDA sensing on the palm. However, robust electrical connection between ultrathin devices and rigid circuit boards is a long missing component for ambulatory use. To minimize the well-known strain concentration at their interfaces, we propose heterogeneous serpentine ribbons (HSPR), which refer to a GET serpentine partially overlapping with a gold serpentine without added adhesive. A fifty-fold strain reduction in HSPR vs. heterogeneous straight ribbons (HSTR) has been discovered and understood. The combination of HSPR and a soft interlayer between the GET and an EDA wristband enabled ambulatory EDA monitoring on the palm in free-living conditions. A newly developed EDA event selection policy leveraging unbiased selection of phasic events validated our GET EDA sensor against gold standards.

Date: 2022
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DOI: 10.1038/s41467-022-34406-2

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