摘要
为改善氧化铜(CuO)传感器的灵敏度,以氮苯基甘氨酸(NAN)、氧化石墨烯(GO)为原材料,在磷酸缓冲液支持的电解质溶液中,通过电化学聚合法在玻碳电极上制备出碳基复合材料(rGO/NPAN),并以其为支撑材料,采用循环伏安法将氧化铜与之复合最终形成氧化铜/石墨烯/N取代羧基聚苯胺(CuO/rGO/NPAN)电化学传感器。N取代羧基聚苯胺的强吸附性、及石墨烯的大比表面积、高导电性有利于氧化铜的均匀分布。利用扫描电镜(SEM)对CuO/rGO/NPAN传感器的形貌进行表征,讨论了pH值、扫描速率等因素对电化学活性和电催化活性的影响,采用循环伏安发、计时电位法、交流阻抗法对该传感器的电化学性能进行研究,并对其电化学机理进行探讨。结果表明,该修饰电极具有低的检测电位、高的电化学响应及良好的稳定性,检测亚硝酸根的浓度范围为(0.5×10-6)～(7.4×10-3)mol/L与(7.4×10-3)～(22.9×10-3)mol/L。灵敏度为32.317μA/(mmol·L),检测下限低至0.15μmol/L(S/N=3)。将此传感器用于实际应用,回收率在99.9%～112%之间。
To improve the sensitivity of sensor of CuO,the carbon matrix composite(rGO/NPAN)was electropolymerized on a glassy carbon electrode at first with the functioned NAN and GO as raw materials,and then the CuO/rGO/NPAN sensor was fabricated for the determination of NO2-by cycle voltammetry in the presence of PBS in this work.The strong adsorption of N-substituted carboxylic polyaniline,great surface area and high conductivity of reduced gaphene oxide can make copper dioxide loaded well and improve electrocatalytic properties of CuO/rGO/NPAN sensor.The structure of the composite was characterized by scanning electron microscopy(SEM).In addition,the factors,such as pH values and scanning rates were discussed in terms of electrochemical activity and electrocatalytic activity.The electrochemical properties of the CuO/rGO/NPAN sensor were investigated by cyclic voltammetry,chromatography and electrochemical impedance.Experimental results show that the modified electrode had good catalytic effect to nitrite oxidation.Compared with copper dioxide modified electrode,CuO/rGO/NPAN modified electrode had lower detection potential,higher response current and sensitivity to nitrite.The linear range was(0.5×10^-6)-(7.4×10^-3)mol/L and(7.4×10^-3)-(22.9×10^-3)mol/L,the sensitivity was 32.317μA/(mmol·L),and the detection limit of 0.15 mol/L(S/N=3).The prepared sensor was successfully applied for the determination for NO 2-in practical samples and the recovery ranged from 99%to 112%.
作者
叶小爱
章家立
关婷婷
YE Xiaoai;ZHANG Jiali;GUAN Tingting(School of Materials Science and Engineering, East China Jiao Tong University, Nanchang 330013,China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2018年第12期12123-12128,共6页
Journal of Functional Materials
基金
国家自然科学基金资助项目(21464006)
关键词
氧化铜
碳基复合材料
亚硝酸盐
循环伏安
copper oxide
carbon matrix composites
nitrite
cyclic voltammetry
