Title |
Hematite Nanoparticles-Modified Electrode Based Electrochemical Sensing Platform for Dopamine
|
---|---|
Published in |
The Scientific World Journal, July 2014
|
DOI | 10.1155/2014/396135 |
Pubmed ID | |
Authors |
Khosro Zangeneh Kamali, Pandikumar Alagarsamy, Nay Ming Huang, Boon Hoong Ong, Hong Ngee Lim |
Abstract |
Hematite (α-Fe2O3) nanoparticles were synthesized by the solid transformation of ferrous hydroxide and ferrihydrite in hydrothermal condition. The as-prepared α-Fe2O3 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-Fe2O3 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 μM with LoD of 1.6 μM for DA. Square wave voltammetry showed a linear response in the range of 0-35 μM with LoD of 236 nM for DA. |
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