CH3 NH3 PbI3/TiO2 复合纳米线制备及表征

采用水热法合成了纯锐钛矿TiO_2纳米线,并以此为模板结合滴涂法制备了CH_3NH_3PbI_3/TiO_2异质结复合纳米线.首先通过X射线衍射(XRD)、扫描电子显微镜(SEM)、高分辨透射电镜(HRTEM)等分析测试手段对样品的结构和形貌进行表征.然后利用拉曼光谱对样品的分子结构进行了研究.最后通过采集紫外一可见一近红外(UV—Vis—NIR)吸收光谱,对样品的的光谱响应性能进行了分析.结果表明:CH_3NH_3PbI_3与TiO_2纳米线复合形成了异质结结构,此复合物作为光催化剂不但可以解决传统TiO_2体系吸收可见光谱带窄的缺点,将光谱范围从紫外扩展到了近红外,还可以减少光生电子与空穴复合机率,有利于提高光催化活性.

Preparation and Characterization of CH3 NH3 PbI3 /TiO2 Composite Nanowires

Heterostructured CH3 NH3 PbI3/TiO2 composite nanowires were prepared by the slip coating method using TiO2 nanowires synthesized via hydrothermal method. The structure and morphology of the samples were characterized by X-ray diffraction ( XRD), scanning electron microscope ( SEM) and high-resolution transmission electron microscope ( HRTEM ) . Then the molecular structure and the spectral response characteristic of the samples were studied by the Raman spectrum and Ultraviolet-visible-near infrared absorption spectrum respectively. The results show that the heterostructured CH3 NH3 PbI3/TiO2 composite nanowires, as a photocatalyst, not only can broaden the spectral response range from ultraviolet to near infrared to solve the problem of narrow spectrum band of TiO2, but also can reduce the recombination probability of photo-generated electrons and holes, thereby it can improve the photocatalytic activity of TiO2 .