Wearable Fluid Capture Devices for Electrochemical Sensing of Sweat

Guijun Li, Xiaoyong Mo, Wing Cheung Law, Kang Cheung Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

67 Citations (Scopus)


Wearable sensing technologies are vital for realizing personalized health monitoring. Noninvasive human sweat sampling is essential for monitoring an individual's physical state using rich physiological data. However, existing wearable sensing technologies lack the controlled capture of body sweat and in performing on-device measurement without inflammatory contact. Herein, we report the development of a wearable sweat-capture device using patterned graphene arrays with controlled superwettability and electrical conductivity for simultaneously capturing and electrochemically measuring sweat droplets. The sweat droplets exhibited strong attachment on the superhydrophilic graphene patterns, even during moderate exercising. The captured sweat droplets present strong electrochemical signals using graphene films as the working electrode and metal pins as the counter electrode arrays assembled on 3D printed holders, at the detection limit of 6 μM for H 2 O 2 sensing. This research enables full-body spatiotemporal mapping of sweat, which is beneficial for a broad range of personalized monitoring applications, such as drug abuse detection, athletics performance optimization, and physiological wellness tracking.

Original languageEnglish
Pages (from-to)238-243
Number of pages6
JournalACS Applied Materials and Interfaces
Issue number1
Publication statusPublished - 9 Jan 2019


  • electrochemical sensing
  • graphene
  • laser scribing
  • superhydrophobic
  • sweat capture

ASJC Scopus subject areas

  • General Materials Science


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