摘要
用石墨烯制备碳糊电极,考察了该电极在K2Fe（CN）6溶液中的电化学性能,结果表明石墨烯对K2Fe（CN）6在GPE电极表面上的电子转移起到了明显的促进作用.用差示脉冲伏安法研究了多巴胺（DA）在该电极上的电化学行为,在磷酸盐缓冲溶液中（pH=7）多巴胺在该电极上呈现明显氧化峰,氧化峰电位随着pH值的增加而负移,在抗坏血酸存在下多巴胺氧化峰峰高与其浓度在3-50μmol/L范围内呈良好的线性关系,检出限为0.8μmol/L.此外,实验结果还表明,该电极具有良好的重现性和稳定性.将该电极用于实际样品中多巴胺的检测,结果令人满意.
Carbon past electrode base on graphene（GPE） was fabricated.The electrochemical behavior of K2Fe（CN）6 on GPE was investigated by cyclic voltammetry.The result indicated that graphene promoted the electron transfer between the interface of analyte and electrode.GPE showed an excellent electrocatalytic effect on the oxidation of dopamine（DA）.The electrochemical behavior of dopamine was studied on GPE by differential pulse voltammetry（DPV）.DPV peak potential of DA decreased linearly with the increase of pH.The capacity of GPE for selective detection of DA was confirmed in a sufficient amount of ascorbic acid（1 mmol/L）.The observed linear range for the determination of dopamine was from 3 μmol/L to 50 μmol/L,and the detection limit was estimated to be 0.8 μmol/L.Furthermore,GPE also exhibited good repeatability and stability.GPE was applied to injection sample analysis,and the results were in good agreement with the standard values.
出处
《陕西科技大学学报（自然科学版）》
2010年第5期37-40,共4页
Journal of Shaanxi University of Science & Technology
关键词
石墨烯
差示脉冲伏安法
多巴胺
抗坏血酸
graphene
differential pulse voltammetry
dopamine
ascorbic acid
