微波法制备氧化锌/石墨烯纳米复合材料用于电化学检测牛乳中的三聚氰胺

Preparation of zinc oxide/graphene nanocomposites by microwave approach for electrochemical detection of melamine in milk

中文关键词:  微波法  三聚氰胺  氧化锌  石墨烯  电化学传感器

英文关键词:microwave method  melamine  zinc oxide  graphene  electrochemical sensor

中文摘要:

      目的 使用一种方便、快捷、经济高效的合成方法, 以石墨烯和醋酸锌为原材料一步固态法直接合成氧化锌/石墨烯(zinc oxide/graphene, ZnO/G)纳米复合材料, 并将其应用于三聚氰胺的电化学检测。方法 使用扫描电子显微镜和X射线衍射仪对ZnO/G纳米复合材料进行了表征, 使用循环伏安法(cyclic voltammetry, CV)、差分脉冲伏安法(differential pulse voltammetry, DPV)进行了电化学响应性、抗干扰性以及稳定性测试。结果 ZnO/G纳米复合材料电极对三聚氰胺具有良好的电化学响应, 线性范围为10~1000 μg/L (r2=0.997), 理论检出限(S/N=3)为0.18 μg/L, 灵敏度为0.17 μA·L/(μg·cm2), 电极稳定性和抗干扰能力优异。结论 ZnO/G纳米复合材料也能够在纯牛奶中检测出痕量的三聚氰胺, 具备对实际样品进行检测的能力。且该检测电极制备方法简单、原材料价格低廉, 在三聚氰胺的检测领域具备良好的应用潜力。

英文摘要:

      Objective To manufacture zinc oxide/graphene (ZnO/G) nanocomposites by a facile, shortcut and cost-effective one-step solid-state approach using graphene and zinc acetate as raw materials for electrochemical detection of melamine. Methods The morphology and structure of the ZnO/G nanocomposites were characterized using scanning electron microscope, X-ray diffraction. The electrochemical response, anti-interference and stability tests of the electrodes were tested using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Results The prepared ZnO/G nanocomposites electrodes exhibited an outstanding electrochemical response to melamine with a linear range of 10?1000 μg/L (r2=0.997), a theoretical detection limit (S/N=3) of 0.18 μg/L, a sensitivity of 0.17 μA·L/(μg·cm2), excellent stability and anti-interference ability. Conclusion ZnO/G nanocomposites can also detect trace melamine in pure milk, and have the ability to detect actual samples. Moreover, the detection electrode is simple to prepare and the raw materials are inexpensive, so it has good potential for application in the field of melamine detection.