18. STRETCHABLE TEXTILE-BASED ENZYMATIC BIOFUEL CELLS AND SELF-POWERED SENSORS

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

Primary Student
Name: Juliane R Sempionatto Moreto
Email: jsempion@ucsd.edu
Phone: 858-246-0671
Grad Year: 2019

Student Collaborators
Itthipon Jeerapan, ijeerapa@eng.ucsd.edu

Abstract
There is a growing demand in the athletic and health care environment to monitor human physiologic function and performance during real-time activities; one of the most demanding examples in the health care, is the necessity that diabetics have to monitor glucose levels in their system. Therefore, wearable performance devices and sensors are becoming more readily available to the general population. Although, most of the existing devices are based on the old-fashioned rigid platform which have aesthetically unfavorable dimensions and are also uncomfortable to wear. The main reason for such disadvantages is the fact that these devices carry an external power source, which is big in size and not flexible and/or stretchable. Considering all these facts, the Center for Wearable Sensors has developed a stretchable textile-based biofuel cells (BFCs) which is also a self-powered sensor, using screen-printing technique. Customized stretchable silver and carbon inks were printed on several highly stretchable textiles, using a judicious designed stencil of serpentine interconnection which increased even more the total stretchability of the system. The device was able to endure multi-forms of large external strains e.g. stretching, indentation, and twisting, with unimpaired functionalities. Glucose and lactate BFCs were studied in order to cover both athletic and health care demands. A single enzyme, membrane-free configuration generated a maximum power density of 160 and 250 W cm−2 with an open circuit voltage of 0.44 and 0.46 V, linear range up to 50 and 20 mM, and sensitivity of 66.496.78 A cm-2 mM-1 and 3.140.20 W cm-2 mM-1, for glucose and lactate, respectively. The stretchable textile-based BFCs were mechanically robust, as power from the enzymatic BFC on textile was stable even after 150 cycles of 100% stretching; this characteristic is crucial for skin worn sensors, once the skin itself cares an intrinsic stretchability. Our textile based BFC self-powered sensor offers a confortable and efficient system for harvesting-sensing platforms, besides being low coast, thus easy to scale up to mass production.

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

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