基于碳纳米笼和金纳米粒子复合物的阿魏酸电化学传感器

An electrochemical sensor for ferulic acid based on carbon nanocages and nanocomposites of gold nanoparticles

采用恒电位沉积法将金纳米粒子(AuNPs)固定到碳纳米笼修饰的玻碳电极(CNCs/GCE)表面,构建了阿魏酸电化学传感器(AuNPs/CNCs/GCE).扫描电镜表征表明制备的AuNPs粒子粒径一致,且均匀地分散于CNCs表面.实验结果表明,AuNPs/CNCs/GCE对阿魏酸的电化学还原具有良好的催化性.最优实验条件下,AuNPs/CNCs/GCE对阿魏酸检测的线性范围是6×10^(-8)～4. 5×10^(-5)mol/L,检出限为4×10^(-9)mol/L(S/N=3).结果表明,Au NPs/CNCs/GCE电化学传感器具有良好的稳定性、重现性和选择性,对实际样品中阿魏酸的测定结果令人满意.

A novel electrochemical sensor for ferulic acid was constructed via electrochemical deposition of gold nanoparticles （AuNPs） on the glassy carbon electrode （CNCs/GCE） modified with carbon nanocages by using a constant potential deposition method. The characterization of the scanning electron microscopy showed that AuNPs with the similar size were distributed uniformly at the surface of CNCs. The results showed that AuNPs/CNCs/GCE displayed an excellent catalysis to the electrochemical reduction of ferulic acid. Under optimum conditions, the peak current of CNCs/GCE was linear with the concentration of ferulic acid in the range of 6×10 -8 ~4.5×10 -5 mol/L with a detection limit of 4×10 -9 mol/L （ S/N =3）. The results have also showed that AuNPs/CNCs/GCE exhibits good stability,reproducibility and selectivity, and has satisfactory results for the determination of ferulic acid in real samples.