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Hematite ( α -Fe 2 O 3 ) nanoparticles were synthesized by the solid transformation of ferrous hydroxide and ferrihydrite in hydrothermal condition. The as-prepared  α -Fe 2 O 3  nanoparticles were characterized by UV-vis, PL, XRD, Raman, TEM, AFM, FESEM, and EDX analysis. The experimental results indicated the formation of uniform hematite nanoparticles with an average size of 45 nm and perfect crystallinity. The electrochemical behavior of a GC/ α -Fe 2 O 3  electrode was studied using CV and EIS techniques with an electrochemical probe, [Fe(CN) 6 ] 3−/4−  redox couple. The electrocatalytic activity was investigated toward DA oxidation in a phosphate buffer solution (pH 6.8) by varying different experimental parameters. The chronoamperometric study showed a linear response in the range of 0–2  μ M with LoD of 1.6  μ M for DA. Square wave voltammetry showed a linear response in the range of 0–35  μ M with LoD of 236 nM for DA.

Hematite Nanoparticles-Modified Electrode Based Electrochemical Sensing Platform for Dopamine