c-dots/mn3o4 nanocomposite as an oxidase nanozyme for colorimetric determination of ferrous ion

At first, c-dots/manganese oxide nanocomposite was synthesized chemically. the presence of mn3o4 nanostructures and c-dots in the synthesized nanocomposite was confirmed by using of xrd, eds, ftir and tem. the proposed method for synthesis is easy and cheap. the mn3o4/c-dots nanocomposite shows oxidase-like activity, which is higher than oxidase-like activity of mn3o4 nanoparticles. in this manner, detection of ferrous ion was possible by using of a competitive reaction between 3,3′,5,5′-tetramethylbenzidine and fe2+ ion in the presence of the synthesized nanocomposite. so, a sensitive and selective colorimetric sensor for determination of fe2+ ion was introduced. the linear range and detection limit for determination of fe2+ ion were obtained as 0.03–0.83 μm and 0.03 μm, respectively.