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A wearable freestanding electrochemical sensing system.

  • Author(s): Zhao, Yichao;
  • Wang, Bo;
  • Hojaiji, Hannaneh;
  • Wang, Zhaoqing;
  • Lin, Shuyu;
  • Yeung, Christopher;
  • Lin, Haisong;
  • Nguyen, Peterson;
  • Chiu, Kaili;
  • Salahi, Kamyar;
  • Cheng, Xuanbing;
  • Tan, Jiawei;
  • Cerrillos, Betto Alcitlali;
  • Emaminejad, Sam
  • et al.
Abstract

To render high-fidelity wearable biomarker data, understanding and engineering the information delivery pathway from epidermally retrieved biofluid to a readout unit are critical. By examining the biomarker information delivery pathway and recognizing near-zero strained regions within a microfluidic device, a strain-isolated pathway to preserve biomarker data fidelity is engineered. Accordingly, a generalizable and disposable freestanding electrochemical sensing system (FESS) is devised, which simultaneously facilitates sensing and out-of-plane signal interconnection with the aid of double-sided adhesion. The FESS serves as a foundation to realize a system-level design strategy, addressing the challenges of wearable biosensing, in the presence of motion, and integration with consumer electronics. To this end, a FESS-enabled smartwatch was developed, featuring sweat sampling, electrochemical sensing, and data display/transmission, all within a self-contained wearable platform. The FESS-enabled smartwatch was used to monitor the sweat metabolite profiles of individuals in sedentary and high-intensity exercise settings.

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