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中文摘要：
本文采用简单的一步化学还原方法合成了粒径均-的纳米Cu2 O 材料并采用扫描电子显微镜对其形貌进行了表征.研究发现,在pH 7. 0 的磷酸盐缓冲溶液中,采用纳米Cu2 O 和Nafion（全氟磺酸离子交换树脂）膜制备的复合修饰电极对多巴胺（DA）呈现出较强的电化学催化作用.优化实验条件后,建立了计时电流法直接测定多巴胺的痕量分析体系.在0. 5 -270 μmol·L-1 浓度范围内,多巴胺的阳极峰电流与浓度呈良好的线性关系（r=0. 9980）,检测限为0. 17 μmol·L-1 ,灵敏度为20. 44 μA mM^-1 且响应时间不超过3 s.该电极可有效屏蔽抗坏血酸（AA）的干扰,在20 倍AA 共存下仍能准确地测定DA.对含50 μmol·L^-1 DA 的溶液平行测定11 次,相对标准偏差为3. 3%,表明修饰电极的重现性和稳定性好.将该修饰电极用于模拟样品中DA的测定,结果令人满意.
英文摘要：
In this work,a one-step,simple route towards synthesizing cuprous oxide（Cu2 O）nanoparticles with uniform particle sizewas explored using chemical reduction method. Then nanomaterial of Cu2 O was characterized by scanning electron microscopy（SEM）. In pH 7. 0 phosphate buffer solution,Cu2 O and Nafion complex modified electrode exhibited a strong electrocatalytic effectto dopamine（DA）compare with the bare glassy carbon electrode. Under the optimized experimental conditions,an electroanalyticalsystem of trace dopamine was established based on chronoamperometry of electrocatalytic properties of Cu2 O modified electrode. Thedetection limit is 0. 17 μmol·L-1 with the sensitivity of 20. 44 μA mM-1 and the reaction time of less than 3 s in a concentrationrange of 0. 5 ~270 μmol·L-1. The concentration of dopamine was able to be accurately measured at 20 times the AA coexistencedue to increase Nafion film. The results of voltammetric determinations show a good reproducibility and stability,and the relativestandard deviation （ RSD） was 3. 3% for the slope of the calibration curve based on the 11 measurements of 50 μMdopamine. Moreover,the developed sensor could be successfully applied to determine dopamine in simulation preparations.
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