摘要
利用聚合物官能团对金属离子的配位作用,在电极表面原位制备了金属粒子。首先在玻碳电极(GCE)表面电沉积聚邻氨基苯甲酸(PoABA),再化学吸附铜离子(Cu2+),用水合肼还原得到单质铜(Cu0)。采用扫描电子显微镜和能谱分析表征了聚邻氨基苯甲酸-铜(PoABA-Cu0)复合薄膜的表面形貌和元素构成,研究了PoABA-Cu0修饰电极的电化学性能,并以其检测了过氧化氢(H2O2)。结果表明,电极表面被修饰上了一层PoABA-Cu0复合薄膜;制备的修饰电极对H2O2具有良好的电催化性能,在邻氨基苯甲酸的聚合圈数为10、Cu2+的吸附时间为10 min、工作电压为-0.3 V时,该修饰电极对H2O2表现出了最佳的检测性能,其线性浓度范围为5.0×10-5～1.0×10-2 mol/L,灵敏度为96.3μA.L/(mmol.cm),检测限为5.0×10-5 mol/L,且具有较好的稳定性。
The complexation of functional groups of polymers to metal ions was exploited to in situ prepare metal particles on the electrode surface.Poly（anthranilic acid）（PoABA） was first electrodeposited onto a glassy carbon electrode（GCE）.Then copper ions（Cu2＋） were chemically adsorbed within the PoABA film,and subsequently reduced by hydrazine hydrate forming copper particles（Cu0）.The surface morphology and element composition of PoABA-Cu0 composite film was characterized by scanning electron microscopy and energy-dispersive X-ray ananlysis.The electrochemical properties of the PoABA-Cu0 modified electrode and its application for the detection of H2O2 were studied.The results show that there are well-distributed Cu particles in the PoABA film;the modified electrode exhibits well performance toward H2O2 electrocatalysis.When the number of potential scans for the polymerization of o-aminobenzoic acid is 10,the adsorption time of Cu2＋ is 10 min,and the working voltage is-0.3 V,the PoABA-Cu0 modified electrode displays the best electroananlytic performance toward H2O2,where the linear H2O2 concentration range is 5.0×10-5～1.0×10-2 mol/L,the sensitivity is 96.34 μA·L/（mmol·cm）,and the detection limit is 5.0×10-5 mol/L.Moreover,the sensing electrode shows a relatively good stability.
出处
《应用化学》
CAS
CSCD
北大核心
2011年第9期1052-1057,共6页
Chinese Journal of Applied Chemistry
基金
湖南省自然科学基金资助项目(10JJ5051)
湖南省科技计划资助项目(2010WK3033)
关键词
聚邻氨基苯甲酸
铜粒子
玻碳修饰电极
过氧化氢
poly（anthranilic acid）
copper particle
modified glassy carbon electrode
hydrogen peroxide
