pH sensor device comprising an ionogel

A pH sensor comprising an ionic liquid stabilised in a gel so as to form an ionogel; and a pH indicator salt. The ionic liquid may comprise a trihexyltetradecylphosphonium [P6,6,6,14]+ cation and one or more of a bis(trifluoromethanesulfonyl) amide [NTf2]-, dicyanoamide [dca]-, dodecylbenzenesulfonate [dbsa]- and p-toluenesulfonate (tosylate) [tos]- anion. The gel may comprise a polymer such as a poly(vinyl chloride) (PVC) derivative, polymethylmethacrylate (PMMA), or a copolymer of N-isopropylacrylamide and N,N'-methylenebis(acrylamide). The ionogel may be fabricated by polymerisation of a monomer solution containing an ionic liquid, and may be fabricated in the presence of a photoinitiator. The ionic liquid may be coupled to the polymer backbone. The pH indicator salt may be coupled to the ionic liquid through ion-pair formation. The ionogel may further comprise an ionophore. Sensor devices comprising the ionogel may comprise a substrate with a plurality of channels each comprising ionogel material, where the individual channels are configured to be sensitive to different pH transitions, depending on the pH indicator salt. The sensor devices may be used for detection or analysis of gases, chemicals, hydrogen peroxide, and sweat.

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