High Peroxidase-like Activity of Single Iron Atoms Anchored on N-doped Porous Carbon for the Colorimetric Detection of Biothiols

Abstract

In this report, single iron atoms anchored on nitrogen-doped porous carbon (Fe-ISAs/CN) was prepared and shown to possess high peroxidase-like activity. Fe-ISAs/CN could efficiently catalyze the oxidation of the peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H2O2, producing a blue color. In terms of the excellent peroxidase-like activity, single iron atoms anchored on nitrogen-doped porous carbon playing a critical role. Besides, an inhibition effect on the oxidation of TMB catalyzed by Fe-ISAs/CN was induced by biothiols in the presence of H2O2. Taking these advantages together, a simple colorimetric method for rapid and sensitive detection of biothiols was established.