High gain fiber-shaped transistor based on rGO-mediated hierarchical polypyrrole for ultrasensitive sweat sensor

Xing Qing, Jianmei Wu, Qing Shu, Dong Wang, Mufang Li, Dan Liu, Xungai Wang, Weiwei Lei (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)

Abstract

Noninvasive wearable biosensors are of great importance in biomarkers monitoring and disease diagnosis.
Among them, the fiber-shaped organic electrochemical transistor (FOECT)-based sensor (FOECTS) has been a
prospective candidate due to its good air permeability and intrinsic compatibility with textiles for daily
healthcare surveillance. However, it is still very challenging to fabricate FOECTSs with high transconductance
(gm) and ultrasensitivity for multi-biomarkers. Herein, a FOECT which gm reached up to 43.18 mS is firstly obtained via simultaneously synthesizing highly ordered polypyrrole (PPy) nanowires and porous PPy microflowers on the reduced graphene oxide(rGO)/cotton@polyethylene terephthalate (CPET) fiber. This novel structure breaks the trade-off relationship between the simultaneous pursuing of high charge carrier mobility and large volumetric capacitance for large gm. A double-layer fabric is designed to shape the channel size and distance between channel and gate electrode, which contributes to the homogeneous and mass fabrication of FOECTSs. By modifying gate electrodes, the detection limits of CPET/plasma/rGO/PPy-based FOECTSs toward dopamine, lactate and glucose reach up to 1 nM, meanwhile, the sensitivity are comparable to the state-of-the-art OECTs. Artificial and real sweat experiments reveal this work paves a new way for next-generation, high-performance wearable sweat biomonitoring.
Original languageEnglish
Article number114297
Pages (from-to)114297
Number of pages8
JournalSensors and Actuators A: Physical
Volume354
DOIs
Publication statusPublished - 1 May 2023

Keywords

  • Fiber-assembled transistor
  • Hierarchical PPy flowers and nanowires
  • High transconductance
  • Reduced graphene oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Metals and Alloys
  • Instrumentation
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering

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