Pasandideh-Nadamani M, Omrani A, Sadeghi-Maleki M R, Samadi-Maybodi A
Faculty of Chemistry, University of Mazanderan, Babolsar, Mazanderan, Iran.
Faculty of Chemistry, University of Mazanderan, Babolsar, Mazanderan, Iran.
Anal Biochem. 2016 Jun 1;502:36-42. doi: 10.1016/j.ab.2016.02.015. Epub 2016 Mar 2.
In this research article, a novel, selective, and sensitive modified carbon paste electrode (CPE) using CdS quantum dots (QDs) is presented. The highly stable CdS QDs were successfully synthesized in an in situ process using Na2S2O3 as a precursor and thioglycolic acid as a catalyst and capping agent. The synthesis of CdS QDs was studied using X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. The synthesized CdS QDs were used for preparation of a modified carbon paste electrode (CdS/CPE). The electrochemical behavior of the electrode toward p-aminophenol (PAP) and acetaminophen (Ac) was studied, and the results demonstrated that the CdS/CPE exhibited good electrocatalytic performance toward PAP and Ac oxidation. The oxidation peak potential of each analyte in the mixture was well separated. As a result, a selective and reliable method was developed for the determination of PAP and Ac simultaneously without any chemical separations. Application of the fabricated electrode for monitoring the process of Ac preparation from PAP was investigated. The obtained results show that CdS/CPE has satisfactory analytical performance; it could be a kind of attractive and promising nanomaterial-based sensor for process monitoring via the electrochemical approach.
在这篇研究文章中，提出了一种使用硫化镉量子点（QDs）的新型、选择性和灵敏的修饰碳糊电极（CPE）。以硫代硫酸钠为前驱体、巯基乙酸为催化剂和封端剂，通过原位法成功合成了高度稳定的硫化镉量子点。利用X射线衍射（XRD）和透射电子显微镜（TEM）技术研究了硫化镉量子点的合成。将合成的硫化镉量子点用于制备修饰碳糊电极（CdS/CPE）。研究了该电极对对氨基苯酚（PAP）和对乙酰氨基酚（Ac）的电化学行为，结果表明CdS/CPE对PAP和Ac的氧化表现出良好的电催化性能。混合物中各分析物的氧化峰电位得到了很好的分离。因此，开发了一种无需任何化学分离即可同时测定PAP和Ac的选择性和可靠方法。研究了所制备电极在监测由PAP制备Ac过程中的应用。所得结果表明，CdS/CPE具有令人满意的分析性能；它可能是一种通过电化学方法进行过程监测的有吸引力且有前景的基于纳米材料的传感器。
