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以氧化石墨烯(GO)为基体,利用钼酸钠为钼源,L-半胱氨酸为硫源,通过水热法成功合成了二硫化钼-石墨烯纳米复合材料(MoS_2-rGO),通过NaBH_4还原氯金酸(HAuCl_4),得到金纳米-二硫化钼-石墨烯纳米复合材料(AuNPs-MoS_2-rGO)。通过紫外-可见吸收光谱法、透射电子显微镜和X射线光电子能谱对材料进行了表征。并且利用该新材料构建了电化学传感器,结果表明,在该复合纳米材料修饰的玻碳电极上,水合肼的氧化过电位明显减小,说明金纳米、二硫化钼和石墨烯对水合肼的催化氧化具有协同作用。用计时电流法实现了对水合肼的灵敏、快速检测,线性范围是0.05~2 000μmol/L,检出限为0.016 7μmol/L(信噪比S/N=3)。回收率在98.0%~105.0%之间。该传感器在水合肼的检测上显示出良好的重现性和稳定性,并且可用于水样的检测,结果令人满意。
Using graphene oxide (GO) as matrix, molybdenum disulfide-graphene nanocomposite (MoS 2 -rGO) was successfully synthesized by hydrothermal method using sodium molybdate as molybdenum source and L-cysteine as sulfur source. AuNPs-MoS_2-rGO was obtained by reduction of HAuCl_4 by NaBH_4. The materials were characterized by ultraviolet-visible absorption spectroscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. And the electrochemical sensor was constructed by using the new material. The results show that the oxidation potential of hydrazine hydrate on the composite nanomaterial modified glassy carbon electrode obviously decreases, indicating that gold nanoparticles, molybdenum disulfide and graphene hydrazine hydrate Catalytic oxidation has a synergistic effect. The method of chronoamperometry was used to detect the hydrazine hydrate. The linear range was 0.05-2000μmol / L, and the detection limit was 0.016 7μmol / L (signal to noise ratio S / N = 3). The recoveries ranged from 98.0% to 105.0%. The sensor shows good reproducibility and stability in hydrazine hydrate detection, and can be used for water sample detection with satisfactory results.