MoS_(2)-ZnO多孔纳米片的光催化及其室温气敏传感性能

Investigation on photocatalysis and room temperature gas sensing of MoS_(2)-ZnO nanocomposite synthesized by hydrothermal method

为开发一种高性能、可回收、低成本的光催化剂,本论文使用水热法制备了多孔结构的ZnO纳米片复合MoS_(2)(MoS_(2)-ZnO)光催化材料。通过XRD、SEM、光致发光光谱(PL)、XPS等手段对样品的形貌、光学性质等进行了测试表征。结果表明,所制备的MoS_(2)-ZnO样品为多孔片状结构;这种复合结构中MoS_(2)不仅有助于增强ZnO中光生载流子的分离效率,而且还能增强可见光区的吸收,从而提高光催化和气敏性能。在模拟太阳光下,MoS_(2)-ZnO纳米复合材料对高浓度(15 mg/L)的亚甲基蓝染液(MB)表现出较高的光催化降解活性。同时,MoS_(2)-ZnO制备的气敏传感器对低浓度(2.05 mg/m^(3))NO_(2)还具有较高的灵敏度。本工作为制备高效太阳能驱动的光催化剂和气体传感器提供了重要参考。

To develop a high performance,recyclable,low cost photocatalyst.In this work,MoS_(2) modified ZnO(MoS_(2)-ZnO)nanocomposites were prepared by a hydrothermal method.The morphology and optical properties of the samples were characterized by XRD,SEM,photoluminescence spectroscopy(PL)and XPS.We find that the prepared MoS_(2)-ZnO samples own a porous structure from SEM.And MoS_(2) can not only enhance the separation efficiency of photocarriers in MoS_(2)-ZnO,but also increase the absorption of visible light region,resulting in improving the photo-catalytic and gas sensitive properties.Under simulated sunlight,the MoS_(2)-ZnO nanocomposite exhibits high photo-catalytic degradation activity for high concentration(15 mg/L)methylene blue dye(MB).At the same time,the MoS_(2)-ZnO-based gas sensor possesses a high sensitivity for NO_(2) concentration of 2.05 mg/m^(3).This work offers a simple strategy to prepare highly efficient visible light-driven photocatalysts and gas sensors.