Abstract

While pH test strips are not decimally accurate and only semiquantitative, the more accurate and automated laboratory-based pH meters lack disposability and portability. Benefiting from advantages of both sides and filling the gap of unmet needs in between, we integrated a miniaturized paper-fluidic electrochemical pH platform coupled with a portable pH device powered by consumer batteries to make digital pH test strips for truly in-field measurements. To overcome the inability to form the smooth and uniform pH-sensitive functionality on screen-printed carbon, i.e., anodically electrodeposited iridium oxide thin films (AEIROFs), reduced graphene oxide was used as substrate for synthesis of homogeneous metal oxide–nanocarbon hybrid thin films, IrO2-reduced graphene oxide (IrO2-rGO), as the sensing moiety with strong substrate adhesion. A hydrophobic barrier-patterned paper micropad (μPAD) with programmed flow rates can locally accelerate linear wicking speed to boost delivery and response time. IrO2-rGO sh...

Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call