摘要
用阳极极化的方式在银电极表面形成氧化银纳米粒子,继而以循环电位扫描方法将羧基化石墨烯沉积到该电极表面,成功制备了石墨烯/纳米氧化银/银电极,并应用于碱性溶液中α-生育酚的检测.采用循环伏安法分别对修饰电极和α-生育酚在修饰电极上的催化氧化行为进行了研究.并使用该修饰电极,利用阳极扫描极化反向催化伏安法检测了α-生育酚.实验结果表明,该修饰电极性能稳定,方法灵敏度高,差值峰电流与α-生育酚浓度分别在0.02~0.32μmol/L和0.32~4.0μmol/L范围内存在线性关系,方法检测限达到0.01μmol/L.
Silver oxide nanoparticles were formed at the surface of a silver electrode with anodic polarization, then the carboxyl graphene-nanosheets were electrodeposited on the silver oxide with cyclic potential scanning, and the graphene/silver oxide/silver electrode was successfully prepared and applied in detection of a-tocopherol in the alkaline medium. The electrochemical behavior and the electrocatalytic activity of the modified electrode were investigated using cyclic voltammetry. The a-tocopherol was detected by means of this modified electrode and the positive scan polarization reverse catalytic voltammetry. The experimental results demonstrate that the thus-prepared modified electrode is stable and has high sensitivity. Two linear relationships between the difference value peak current and the a- tocopherol concentration are obtained in the range of 0.02-0.32μmol/Land0.32-4.0μmol/L respectively, with a limit of detection reaching 0.01 μmol/L.
作者
史天洋
吴守国
魏巍
SHI Tianyang;WU Shouguo;WEI Wei(Department of Chemistry, University of Science and Technology of China, He fei 230026 , Chin)
基金
国家重点基础研究发展(973)计划(2013CB933900)资助
关键词
电化学催化氧化
羧基化石墨烯
生育酚
氧化银
阳极扫描极化反向催化伏安法
electrocatalytic oxidation
carboxyl graphene
tocopherol
silver oxide
positive scan polarization reverse catalytic voltammetry
