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Citation: YANG Xiao-Hong, WANG Guang-Feng, DENG Xiang-Hui, ZHANG Wen-Zhi, LI Mao-Guo, KAN Xian-Wen, FANG Bin. Preparation of Fe₃O₄ Nanoparticle Modified Electrode and Its Electrocatalic Oxidation of Dopamine[J]. Chinese Journal of Applied Chemistry, ;2005, 22(7): 776-779. shu

Preparation of Fe₃O₄ Nanoparticle Modified Electrode and Its Electrocatalic Oxidation of Dopamine

1.
a School of Chemistry and Matericals Science, Anhui Normal University, Wuhu 241000;
2.
b Department of Chemistry, Chizhou Teacher's College, Anhui Province, Guichi

Corresponding author: FANG Bin,
Received Date: 10 October 2004
Available Online: 31 January 2005
Fund Project: 国家教育部重点科技基金(00117) (00117)安徽师范大学青年基金(143-120043) (143-120043)安徽省教育厅自然科学基金(2004kj171)资助项目 (2004kj171)

A novel gold electrode modified with Fe₃O₄ nanoparticles was constructed and characterized by means of electrochemical impedance spectroscopy and cyclic voltammertry.The modified electrode exhibits strong promoting effect and high stability toward the electrochemical oxidation of dopamine (DA),which gives reversible redox peaks at a formal potential of 0.192 V (vs.Ag/AgCl) in a pH=7.0 phosphate buffer solution.The anodic peak current (measured with constant potential amperometry) increass linearly with the increased concentration of dopamine in the range of 1.5×10^-7 to 4.0×10^-4 mol/L and the linear regression equation is i_p(μA)=0.715+0.272 c(μmol/L).The detection limit (S/N=3) obtained was 3.0×10^-8 mol/L.The relative standard deviation (RSD) of 8 successive scans is 3.4% for 1.5×10^-6 mol/L DA.The interference of ascorbic acid with the determination of DA could be eliminated efficiently.The proposed method shows excellent sensitivity and recovery.
- Fe₃O₄ nanoparticles,
- modified electrode,
- dopamine,
- determination,
- ascorbic acid (AA)
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Preparation of Fe₃O₄ Nanoparticle Modified Electrode and Its Electrocatalic Oxidation of Dopamine