MnFe2O4/还原氧化石墨烯纳米复合材料的光学性能  

Optical properties of MnFe2O4/reduced graphene oxide nanocomposites

作　　者：丁梅杰 张旭东[2] 魏智强[1,2] 黄尚攀 姜金龙[2] DING Meijie;ZHANG Xudong;WEI Zhiqiang;HUANG Shangpan;JIANG Jinlong(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;College of Science,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [2]兰州理工大学理学院,兰州730050

出　　处：《复合材料学报》2020年第7期1713-1720,共8页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51261015);甘肃省自然科学基金(1308RJZA238);兰州理工大学红柳一流学科建设项目。

摘　　要：由于纳米尺度的尖晶石结构金属氧化物独特的晶体结构和能带结构,使其具有广阔的应用前景。采用水热法合成了MnFe2O4复合还原氧化石墨烯(MnFe2O4/rGO)纳米复合材料,采用XRD、高分辨透射电子显微镜(HRTEM)、能量色散X射线光谱仪(EDX)、FTIR、XPS、拉曼光谱(Raman)、光致发光光谱(PL)和紫外-可见光谱漫反射(UV-vis DRS)对样品的晶体结构、形貌、元素分布、结合能和光学性能进行表征。结果表明,制备的MnFe2O/rGO复合材料为立方尖晶石结构,形貌呈不规则的椭球形,颗粒大小比较均匀。rGO表面所负载的MnFe2O4纳米粒子被石墨烯部分包裹,颗粒尺寸小,分散性好。MnFe2O4/rGO复合材料的电子-空穴对的再结合效率降低,其中石墨烯具有较多缺陷,无序程度较高,含氧基团被聚乙烯吡咯烷酮(PVP)部分还原,数量大大减少。MnFe2O4/rGO复合材料的带隙小于纯MnFe2O4带隙,发生了红移现象。The nanoscale spinel structure metal oxide possesses broad application prospect due to its unique crystal structure and band structure.The MnFe2O4/reduced graphene oxide(rGO)nanocomposites were synthesized by hydrothermal method,the crystal structure,morphology,element distribution,binding energy and optical properties were characterized by XRD,high-resolution transmission electron microscope(HRTEM),energy dispersive X-ray spectrometer(EDX),FTIR,XPS,Raman spectroscopy(Raman),photoluminescence spectroscopy(PL)and UV-vis diffuse reflection spectroscopy(UV-vis DRS).The results show that the MnFe2O4/rGO nanocomposites prepared by this method have cubic spinel structure.The morphology is irregular ellipsoid with uniform particle size.MnFe2O4 nanoparticles loaded on the surface of rGO are partially coated with graphene,possessing small particle size and good dispersion.The MnFe2O4/rGO nanocomposites exhibit lower recombination efficiency of electronhole pairs.The graphene has more defects and higher disorder degree.The oxygen-containing groups are partially reduced by polyvinyl pyrrolidone(PVP),and the quantity is greatly reduced.The band gap of MnFe2O4/rGO composite is narrower than that of pure MnFe2O4,resulting in red shift.

关 键 词：MnFe2O4 还原氧化石墨烯(rGO) 微观结构 光学性能 金属氧化物 纳米复合材料 

分 类 号：TB34[一般工业技术—材料科学与工程]