Portable Electrochemical Gas Sensing System with a Paper-Based Enzyme Electrode
Abstract: An unconventional
portable electrochemical gas sensor composed of a smartphone, a fingersized
sensing chip and a single use paper-based enzyme electrode was proposed to
detect a particular target gaseous inclusion for self-breath-analysis with
ease. This attempt allowed us to monitor our physical status immediately and
continuously regardless of a time, place or person due to the improved convenience,
immediacy, and affordability. The custom CMOS chip with the capability of
performing an amperometric determination when the power voltage supplied from
the earphone jack of a smartphone was designed as an analytical device. A
disposable enzyme electrode was prepared simply from achromatography paper and
a commercial carbon pencil instead of the conventional indisposable material and
complex manufacturing process. The quantification of ethanol in gaseous samples
was demonstrated in range from 50 to 500ppm (V/V) in accord with concentrations
in exhaled breath. The response current increased linearly with increasing
vapor ethanol concentration.
Keywords: bio-sniffer,
ethanol, electrochemical detection, CMOS integrated device, paper-based enzyme electrode
Author: Shogo Kawahara
Journal Code: jptkomputergg170067
