Manganese-doped hematite nanoplates with enhanced and non-enzymatic electrochemical sensing performance

ABSTRACT

Mn-doped α-Fe₂O₃ (α-Fe_2-xMn_xO₃) nanoplates were synthesized by facile hydrolysis method. The structure and morphology of the samples were characterized by various techniques. The nanoplates were used to modify glassy carbon electrode (GCE), which was used to detect uric acid by cyclic voltammetry and chronoamperometry. Compared with bare and α-Fe₂O₃/GCE, α-Fe_2-xMn_xO₃/GCE showed higher oxidation peak current, with a shift in oxidation potential. Improvement in electrochemical detecting performance is mainly attributed to manganese addition. α-Fe_1.6Mn_0.4O₃/GCE exhibits an excellent activity, good sensitivity, stability, repeatability and reproducibility.

KEYWORDS:

• Uric acid
• Mn-doped α-Fe₂O₃
• nanoplates
• electrocatalyst

Acknowledgments

The authors acknowledge the FE-SEM and TEM facility provided by the National Centre for Nanoscience and Nanotechnology, University of Madras.