Electrochemiluminescence modified electrodes based on RuSi@Ru(bpy)3(2+) loaded with gold functioned nanoporous CO/Co3O4 for detection of mycotoxin deoxynivalenol.

Abstract

Nanoporous cobalt (NPCo) with three-dimensional network nanostructure was obtained by selectively dealloying Al from CoAl alloy in a mild alkaline solution. Co3O4 grew further on the surface of NPCo and then NPCo/Co3O4 was obtained. Gold nanoparticles functionalized NPCo/Co3O4 (NPCo/Co3O4-Au) was used to fabricate electrochemiluminescence (ECL) modified electrodes for detecting mycotoxin deoxynivalenol (DON). In addition the introduction of AuNPs enhanced the conductivity, and NPCo/Co3O4-Au exhibited excellent catalytic properties for the luminescence of RuSi@Ru(bpy)3(2+). The fabricated ECL modified electrodes exhibited a high activity for DON in a wide linear range from 5 pg/mL to 100 ng/mL with a low detection limit of 1 pg/mL. The NPCo/Co3O4-Au based ECL modified electrodes displayed excellent stability and reproducibility, and successfully achieved the detection of DON in wheat flour with desirable results as well. The NPCo/Co3O4-Au possesses great application potential for ECL modified electrodes with sample detection, unique catalytic activity, and high structure stability.