超声合成纳米硫化镉及苯酚在其修饰电极上的电化学行为研究  

Sonochemical Synthesis of CdS Nanoparticles(CdSNCs) and Studies of the Electrochemical Behavior of phenol at CdSNCs Modified Electrode

作　　者：吴艳丹[1] 王立世[1] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640

出　　处：《分析测试学报》2008年第7期729-733,738,共6页Journal of Instrumental Analysis

基　　金：国家自然科学基金资助项目(20475018);广东省自然科学基金资助项目(07006544)

摘　　要：采用一种快捷的超声化学方法成功合成了纳米级的硫化镉颗粒（CdSNCs）,并进行X粉末衍射、透射电镜以及扫描电镜观察,合成物的颗粒直径平均在2-5 nm,形貌均一。将该材料用于制备一种电化学传感器,纳米硫化镉修饰电极对苯酚的电化学氧化有明显的催化作用,对苯酚的检测和分析有良好的响应。采用循环伏安法、微分脉冲伏安法研究苯酚在纳米硫化镉修饰电极上的电化学行为,结果显示,实验条件下苯酚在CdSNCs修饰电极上的氧化反应受扩散过程控制,为前行化学反应（CE）,催化氧化峰电流与苯酚浓度在2.0×10^-7-2.0×10^-4mol/L范围内呈良好的线性关系,检出限达2.0×10^-8mol/L（S/N=3）。Nanoparticles of cadmium sulfide（CdSNCs） have been successfully prepared by a facilely sonochemical method from an aqueous solution of cadmium chloride and sodium sulfide.The size of the CdSNCs prepared was about 2-5 nm according to X-ray diffraction spectra and transmission electron microscopy images.The electrochemical behaviors of the CdSNCs modified glassy carbon electrode（GCE） have been studied and showed distinct advantages,such as higher catalysis activity and lower detection limit for phenol.A novel phenol sensor was constructed through modification of CdS nanoparticles on a GCE.The electrode showed good electrochemical activity in pH 6.0 phosphoric acid buffer solution.Experimental results showed that phenol could be oxidized by the modified electrode to form a detectable product.The linear range for phenol determination ranged from 2.0×10^-7 mol/L to 2.0×10^-4 mol/L with a detection limit of 2.0×10^-8 mol/L.The possible mechanism of the electrochemical oxidation of phenol-solution was also investigated.

关 键 词：超声化学合成 硫化镉纳米颗粒 修饰电极 电化学行为 

分 类 号：O657.1[理学—分析化学] TE665.5[理学—化学]