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Nanoporous Gold Electrocatalysis

Electrocatalytic sensing technique is used as the detection platform, combined with unique sampling methods to non-intrusively measure the biomarkers that are indications of different disorders. A fundamentally different approach than standard electrochemical sensing, electrocatalysis is based on metallized Nafion® or solid polymer electrolyte  membranes.  The nanoporous metallic electrocatalyst in direct contact with gas phase molecules reacts to generate a measurable signal similar to Clark-type sensors. This characteristic of an electrocatalytic sensor combined with extremely high surface area leads to high mass transfer, high reaction rate, pronounced amperometric signal, and rapid rise and fall in the signal suitable for real-time detection.

100,000 X SEM Image of Sensing Surface
100,000 X SEM Image of Sensing Surface

A fundamentally different arrangement from standard electrochemical sensing approach, electrocatalysis is based on metallized Nafion® or solid polymer electrolyte  membranes. In this case, the nanoporous metallic electrocatalyst is in direct contact with the gas phase molecules which do not have to diffuse through a membrane to react on the sensing surface as is the case in Clark-type sensors. 

Intense Reactivity at the Electrocatalyst Surface
Intense Reactivity at the Electrocatalyst Surface

This characteristic of an electrocatalytic sensor combined with extremely high surface area leads to high mass transfer, high reaction rate, pronounced amperometric signal, and rapid rise and fall in the signal suitable for real-time detection. ​