摘要
应用静电力自组装的方法在掺硼金刚石薄膜(BDD)电极表面制备了纳米Au颗粒的单层膜,通过高温加热使纳米Au颗粒牢固修饰在BDD薄膜表面。采用SEM和XPS对其表面形貌进行了表征,纳米Au颗粒在BDD薄膜表面分散均匀,且不存在团聚现象。采用循环伏安法和电化学阻抗谱对其电化学性能进行了研究,并对多巴胺进行了检测。结果表明:修饰后的BDD电极界面间电子转移速率显著提高,且对多巴胺表现出良好的电催化性;氧化峰电位由0.52V减小为0.3V,且氧化峰电流为BDD电极的1.9倍,检测限为3.0×10-6 mol/L,且在多巴胺和尿酸的混合溶液中有很强的选择性,为生物分子的检测提供了新方法。
Gold nanoparticles modified BDD electrode was prepared by using electrostatic self-assembly method.The gold nanoparticles can be firmly stable on the surface of BDD film after heat treatment.The morphology was characterized by using SEM and XPS.Gold nanoparticles were dispersed on the surface of BDD filmuniformly and did not exist rally phenomenon.The electrochemical performance was tested by cyclic voltammetry and electrochemical impedance spectroscopy,the response to dopamine was also examined.The results showed that the modified electrode interface electron transfer rate increased significantly and had good electrocatalytic properties to dopamine.The oxidation peak potential reduced from0.52 Vto 0.3V,and the oxidation current was 1.9times of BDD electrode.The detection limit was 3.0×10-6 mol/L.The modified electrode had strong selectivity in the mixed solution of dopamine and uric acid,and provided a new method for the detection of biological molecules.
出处
《化工新型材料》
CAS
CSCD
北大核心
2016年第3期28-30,34,共4页
New Chemical Materials
基金
国家自然基金项目(51375253)
