Graphene e-tattoos for unobstructive ambulatory electrodermal activity sensing on the palm enabled by heterogeneous serpentine ribbons
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 03, 2022
- Source ID
- 10.1038/s41467-022-34406-2
Entities
People
- Eunbin Kim
- Hongwoo Jang
- Kaan Sel
- Kyoung-ho Ha
- Nanshu Lu
- Rebecca Wang
- Roozbeh Jafari
- Sangjun Kim
- Seungmin Kang
- Xiangxing Yang
- Yifan Rao
Organizations
- National Science Foundation
- Office of Naval Research