Huang Xue, Li Yongxin, Wang Po, Wang Lun
Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, P. R. China.
Anal Sci. 2008 Dec;24(12):1563-8. doi: 10.2116/analsci.24.1563.
A kind of novel nanocomposites, poly(3-methylthiophene) (P3MT)/gold nanoparticles (AuNPs), were successfully deposited onto the surface of a glassy carbon electrode. A field emission scanning electron microscope (FE-SEM) and electrochemical techniques were used for characterizing this modified electrode. The results showed that the AuNPs were inserted into a P3MT layer uniformly, and formed a porous 3D structure. This modified electrode showed excellent electrocatalytic activity towards the oxidation of ascorbic acid (AA), dopamine (DA) and uric acid (UA); the overlapping anodic peaks of AA, DA and UA were completely divided into three well-defined voltammetric peaks. A further study showed that there existed a linear relationship between the peak current and the concentration of DA in the range of 1.0 x 10(-6) to 3.5 x 10(-5) mol L(-1), and UA in the range of 1.0 x 10(-6) to 3.2 x 10(-5) mol L(-1). The detection limits were 2.4 x 10(-7) mol L(-1) for DA and 1.7 x 10(-7) mol L(-1) for UA. This proposed method was applied to the detection of real samples, and the results were satisfactory.
一种新型纳米复合材料，聚（3 - 甲基噻吩）（P3MT）/金纳米粒子（AuNPs），成功沉积在玻碳电极表面。用场发射扫描电子显微镜（FE - SEM）和电化学技术对该修饰电极进行表征。结果表明，AuNPs均匀插入P3MT层中，形成多孔三维结构。该修饰电极对维生素C（AA）、多巴胺（DA）和尿酸（UA）的氧化表现出优异的电催化活性；AA、DA和UA重叠的阳极峰完全分离为三个清晰的伏安峰。进一步研究表明，在1.0×10⁻⁶至3.5×10⁻⁵ mol L⁻¹范围内，DA的峰电流与浓度之间存在线性关系，在1.0×10⁻⁶至3.2×10⁻⁵ mol L⁻¹范围内，UA的峰电流与浓度之间存在线性关系。DA的检测限为2.4×10⁻⁷ mol L⁻¹，UA的检测限为1.7×10⁻⁷ mol L⁻¹。该方法应用于实际样品检测，结果令人满意。
