4.6 Article

Potentiometric pH Sensor Based on Flexible Screen-Printable Polyaniline Composite for Textile-Based Microfluidic Applications

期刊

MICROMACHINES
卷 13, 期 9, 页码 -

出版社

MDPI
DOI: 10.3390/mi13091376

关键词

skin pH sensor; wearable pH sensor; textile-based sensor; screen-printable pH sensor; wearable microfluidics; flexible pH sensor; polymer nanocomposite; micro clothing-based analytical systems; screen-printable polyaniline composite

资金

  1. Natural Sciences and Engineering Research Council (NSERC) [RGPIN-2019-05586]
  2. NSERC Canada Graduate Scholarships-Master's (CSG-M) award

向作者/读者索取更多资源

This paper presents the development of a flexible, textile-based, screen-printed electrode system for biosensing applications, specifically for real-time pH measurement. The optimized polyaniline (PANI) composite-based sensors demonstrated high sensitivity and sufficient response time for pH measurement.
Skin pH can be used for monitoring infections in a healing wound, the onset of dermatitis, and hydration in sports medicine, but many challenges exist in integrating conventional sensing materials into wearable platforms. We present the development of a flexible, textile-based, screen-printed electrode system for biosensing applications, and demonstrate flexible polyaniline (PANI) composite-based potentiometric sensors on a textile substrate for real-time pH measurement. The pH response of the optimized PANI/dodecylbenzene sulfonic acid/screen-printing ink composite is compared to electropolymerized and drop-cast PANI sensors via open circuit potential measurements. High sensitivity was observed for all sensors between pH 3-10, with a composite based on PANI emeraldine base, demonstrating sufficient response time and a linear sensitivity of -27.9 mV/pH. This exceeded prior flexible screen-printed pH sensors in which all parts of the sensor, including the pH sensing material, are screen-printed. Even better sensitivity was observed for a PANI emeraldine salt composite (-42.6 mV/pH), although the response was less linear. Furthermore, the sensor was integrated into a screen-printed microfluidic channel demonstrating sample isolation during measurement for wearable, micro cloth-based analytical devices. This is the first fully screen-printed flexible PANI composite pH sensor demonstrated on a textile substrate that can additionally be integrated with textile-based microfluidic channels.

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