离子液体-石墨烯修饰碳纤维微电极电化学性能研究
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摘要
本实验制备了离子液体-石墨烯修饰碳纤维微电极,采用循环伏安法和差分脉冲伏安法测定多巴胺(DA)在该修饰电极上的电化学行为。实验结果显示,修饰后电极的稳定性和重现性明显增加,DA在修饰电极上的氧化过程受扩散控制。在5×10-7-1×10-4mol/L浓度范围内,DA在修饰电极上的氧化峰电流与其浓度呈现良好的线性关系。
In this paper, the carbon fiber microelectrode modified with ionic liquid-graphene composites was fabricated, the electrochemical behaviors of dopamine(DA) at the modified carbon fiber microelectrode were determined with cyclic voltammetry and differential pulse voltammetric method. The results showed that the modified electrode showed good stability and duplicability. The oxidation of DA on the surface of the modified carbon fiber microelectrode belongs to the diffusion controlled reaction. In the 20mmol/L Tris-HCl(p H7.4) buffer solution, for DA determination, the oxidation peak current and the concentration of DA showed good linear relationships.
In this paper, the carbon fiber microelectrode modified with ionic liquid-graphene composites was fabricated, the electrochemical behaviors of dopamine(DA) at the modified carbon fiber microelectrode were determined with cyclic voltammetry and differential pulse voltammetric method. The results showed that the modified electrode showed good stability and duplicability. The oxidation of DA on the surface of the modified carbon fiber microelectrode belongs to the diffusion controlled reaction. In the 20mmol/L Tris-HCl(p H7.4) buffer solution, for DA determination, the oxidation peak current and the concentration of DA showed good linear relationships.
引文
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[5]刘灵芳,冶保献,李凤菊.碳纤维微电极差示脉冲伏安法大量抗坏血酸存在下测定痕量多巴胺[J].测绘学院学报,2002,19(2):154-156.
[2]徐超,陈胜,汪信.基于石墨烯的材料化学进展[J].应用化学,2011,28(1):1-9.
[3]Ji Q M,Itaru H,Paek S M,et al.Layer-by-Layer Films of Graphene and lonic Liquids for Highly Selective Gas Sensing[J].Angew Chem Int Ed,2010,49:9737.
[4]Li F H,Chai J,Yang H F,et al.Synthesis of Pt/ionic liquid/graphene nanocomposite and its simultaneous determination of ascorbic acid and dopamine[J].Talanta,2010,81(3):1063-1068.
[5]刘灵芳,冶保献,李凤菊.碳纤维微电极差示脉冲伏安法大量抗坏血酸存在下测定痕量多巴胺[J].测绘学院学报,2002,19(2):154-156.