微波水热法制备ZnO/氧化石墨烯及其光电化学性能研究

Synthesis of ZnO/graphene oxide nanocomposite by microwave hydrothermal method and its photoelectrochemical property

利用微波水热法在316L不锈钢片基底上制备一维ZnO纳米阵列/氧化石墨烯(ZnO/GO)复合材料,借助SEM、TEM、UV-Vis及可见光光照下的恒电位i-t曲线等手段,对加入氧化石墨烯浓度不同的ZnO/GO样品的形貌、结构及光电化学性能进行表征。结果表明,ZnO纳米棒均匀垂直于316L不锈钢基底生长,GO片层嵌入在ZnO纳米棒结构中间;GO的引入促进了ZnO中产生的光生电子-空穴对的分离,从而使ZnO/GO复合材料相较于ZnO具有更佳的光电化学性能。当加入GO溶液浓度为0.5mg/mL时,所制样品中ZnO纳米棒阵列发育完善、排列致密,样品的光电流密度达到18μA/cm^2,为纯一维ZnO纳米结构相应值的3.6倍。

The one-dimentional ZnO/graphene oxide(ZnO/GO)were rapidly synthesized on the 316L stainless steel substrate by microwave hydrothermal method.The morphology,structure and photoelectrochemical property of the as-prepared nanocomposites were characterized by SEM,TEM,UV-Vis and amperometric i-t curve under visible light.The results show that uniform ZnO nanorods vertically grow on the substrate with layer-like GO embedded in the structure.ZnO/GO nanocomposite exhibits much improved photoelectrochemical property over ZnO nanoarrays because the introduction of GO facilitates the separation of photogenerated electron-hole pairs in ZnO.When the GO concentration is 0.5mg/mL,well-grown ZnO nanorods are densely arranged on the substrate,and the photocurrent density of the sample reaches18μA/cm^2,which is 3.6times than that of one-dimentional ZnO nanoarrays.