AuNPs-MoS_2-rGO纳米复合材料的合成及其对水合肼的电化学检测  

Synthesis of Gold Nanoparticles-Molybdenum Disulfide-Graphene Nanocomposites and Electrochemical Detection of Hydrazine

作　　者：郭玉晶[1] 王秀芳[1] 刘志广[1] 张国娟[1] 

机构地区：[1]山西大学环境科学研究所化学化工学院,山西太原030006

出　　处：《山西大学学报（自然科学版）》2017年第3期554-562,共9页Journal of Shanxi University(Natural Science Edition)

基　　金：国家自然科学基金(21275093);山西省2016年青年"三晋"学者计划

摘　　要：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。Gold nanoparticles supported on molybdenum disulfide functionalized graphene （AuNPs-MoS2- rGO）were synthesized through hydrothermal method and NaBH4 reduction method, using graphene oxide （GO） as the matrix, sodium molybdenum as molybdenum source and L-cysteine as sulfur source. The nanocomposites were characterized by ultraviolet-visible absorption spectra, transmission electron micro- scope and X-ray photoelectron spectroscopy. The electrochemical sensor was constructed by using the new nanocomposite. The results show that on the nanocomposite modified glassy carbon electrode, the oxida- tion overpotential of hydrazine is obviously reduced, indicating that the gold nanoparticle,molybdenum di- sulfide and graphene have synergistic effect on the catalytic oxidation of hydrazine. Chronoamperometry was used for sensitivedetection of hydrazine. The linear range is from 0.05μmol/L to 2 000 μmol/L. The detection limit is 0. 016 7 μmol/L on the basis of the signal-to-noise characteristics （S/N=3） and the re- coveries are between 98.0% and 105.0%. The developed electrochemical sensor exhibited good stability and reproducibility for the detection of hydrazine. And the AuNPs-MoS2-rGO based electrochemical sensor was also successfully demonstrated for the detection of hydrazine in water sample with satisfactory results.

关 键 词：石墨烯 二硫化钼 金纳米 电化学检测 水合肼 

分 类 号：O657.1[理学—分析化学]