Department: NanoEngineering
Research Institute Affiliation: Center for Wearable Sensors
Faculty Advisor(s): Joseph Wang

Primary Student
Name: Itthipon Jeerapan
Email: ijeerapa@ucsd.edu
Phone: 858-246-0671
Grad Year: 2020

The first example of all-printed and highly stretchable CNT-based electrochemical devices is presented. The exploitation of both tailored screen printable stretchable inks that hold the interesting electrochemical and mechanical properties of CNTs in conjunction with the elastomeric properties of polyurethane as a binder along with a judiciously designed free standing serpentine pattern offers the printed device to possess two degrees of stretchability. The combination of this synergistic design with the nanomaterial based inks allows the device to endure large strains (up to 500% strain), with negligible effect on its structure and functionalities. Electrochemical characterization of the printed device demonstrates that repeated stretching, torsional twisting, and indenting stress has inconsequential influence on its electrochemical properties. The viable applications are shown by fabrication and characterization of a potentiometric ammonium sensor, an amperometric enzyme-based glucose sensor, an enzymatic glucose biofuel cell, and a self-powered biosensor. Furthermore, these materials are applied on a textile to demonstrate a highly stretchable textile-based potentiometric sensor array for multi-ion (i.e. Na+ and K+) determination. This wearable potentiometric sensor array exhibits a Nernstian response. Mechanical deformation studies on this textile-based sensor reveal that stretching up to 100%, bending, crumpling, or even washing have negligible effect on the potentiometric signals. This work is promising for the fabrication of economical, multifunctional, and stretchable printed devices. This will serve the demands of various healthcare and energy jurisdictions wherein mechanical compliance is required.

Industry Application Area(s)
Life Sciences/Medical Devices & Instruments | Materials

Related Links:

  1. http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.5b04549

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