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SEM micrograph of (A) track-etched porous polyimide membrane substrates, (B) ZnO seed deposition on Cr/Au stack, (C) ZnO nanostructures grown with 50 mM precursor concentration in an aqueous chemical bath, (D) Structural dimensions and surface roughness values of the electrochemical biosensor platform. The pores enable low volume fluid absorption “wicking” thus enhancing biomolecular binding on the functionalized ZnO nanostructures.
