Gold/MnO2 particles decorated on electrodeposited polyaniline toward non-enzymatic electrochemical sensor for glucose

Abstract

Gold nano-particles and MnO2 are decorated on polyaniline support to be used as the catalyst in non-enzymatic electrochemical sensing of glucose. The polyaniline is prepared by electro-polymerization, and decoration of the gold nano-particles and MnO2 are conducted by direct-dropping KAuCl4 and KMnO4 solutions onto the polyaniline, respectively. The catalytic activity in glucose oxidation is evaluated by cyclic voltammetry in 0.1 M KOH containing 0∼50 mM of glucose. The catalytic activity is found to be affected by the sequence of the decoration process. The catalytic activity is higher when the MnO2 decoration is conducted before the gold nano-particle decoration. The sensitivity was 13.1 μA/cm2·mM in a glucose concentration of 0.5 to 10.0 mM for an electrode comprised of gold nanoparticles-MnO2 on polyaniline.

Keywords

• Glucose oxidation
• Gold nano-particles
• MnO2
• Non-enzymatic
• Electrochemical sensor
• Polyaniline