Solid-state urea biosensor

Abstract

A solid-state urea biosensor may comprise a substrate, an electrically conductive layer, a PH sensing film, an ammonium ion selecting film and a ferment film. The electrically conductive layer covers the substrate. The PH sensing film has a PH value measuring zone, partially covering the electrically conductive layer, for measuring the PH value of a solution to be tested. The ammonium ion selecting film has an ammonium ion measuring zone for measuring the ammonium ion concentration. The ammonium ion selecting film partially covers the PH sensing film and exposes the PH value measuring zone. The ferment film is used for measuring the urea concentration in the solution, wherein the ferment film partially covers the ammonium ion selecting film and exposes the ammonium ion measuring zone.

Dependencies are inferred from the claim text.