ABSTRACT: We report a battery-powered, microelectrochemical
sensing platform that reports its output using an electrochromic
display. The platform is fabricated based on paper fluidics and uses a
Prussian blue spot electrodeposited on an indium-doped tin oxide
thin film as the electrochromic indicator. The integrated metal/air
battery powers both the electrochemical sensor and the electrochromic
read-out, which are in electrical contact via a paper reservoir.
The sample activates the battery and the presence of analyte in the sample initiates the color change of the Prussian blue spot.
The entire system is assembled on the lab bench, without the need for cleanroom facilities. The applicability of the device to
point-of-care sensing is demonstrated by qualitative detection of 0.1 mM glucose and H2O2 in artificial urine samples.