Fig. 4. Examples of Se-based nanosensors in the detection of hydrogen peroxide; (A) schematics of monoclinic Se (m-Se)/protein composites and subsequent formation of Se-protein-nanowires⁷⁶ (B) CVs of SeNP electrode at different Se concentrations without the presence of peroxide (left) and at different concentrations of peroxide (right);⁸⁴ (C) schematic of colorimetric detection of peroxide and xanthine using Se-nanosheets⁹⁴ and (D) dose-response curve for peroxide detection using Se-nanosheets.⁹⁴ (E) The comparison between the possible mechanism of H₂O₂ detection on the surface of bare FTO and nanocomposites electrochemical sensors containing SeNPs.⁹³.