一维CdTe@C@TiO2-Au异质结纳米线的制备及其光催化性能

先利用一步水热法制备了具有核壳结构的CdTe@C纳米线，然后以钛酸异丙酯（TIP）作为钛源对CdTe@C纳米线进行二氧化钛包覆，最后通过原位还原HAuCl4的方法将Au纳米粒子组装到CdTe@C@TiO₂表面形成CdTe@C@TiO₂-Au一维异质结纳米复合材料。用扫描电镜（SEM），X射线能谱（EDX），透射电镜（TEM），X射线衍射（XRD），X射线光电子能谱（XPS）和紫外-可见漫反射光谱（UV-Vis DRS）等对材料进行表征。探究了CdTe@C@TiO₂-Au催化剂在模拟可见光下降解罗丹明B（RhB）的光催化性能。实验结果表明：不同催化剂对RhB的光降解率不一样，其效果依次为CdTe@C@TiO₂-Au > CdTe@C@TiO₂ > pure TiO₂，其中CdTe@C@TiO₂-Au能在270 min的模拟太阳光下对RhB的光降解率达95.3%，这主要得益于CdTe、碳层、TiO₂和具有表面等离子效应的纳米Au的共同作用。

Fabrication and Photocatalytic Performance of One-Dimensional Structured CdTe@C@TiO2-Au Heteronanowires

A novel one-dimensional structured (1D) TiO₂-coated CdTe@C nanowires support for Au nanoparticles (CdTe@C@TiO₂-Au) is synthesized for photocatalysis application. The structure and properties of the prepared photocatalysts are investigated by X-ray powder diffraction (XRD), scanning transmission electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS), and UV-Vis instruments (DRS). As an example of applications, the photodegradation of rhodamine B (RhB) is investigated under the simulated sunlight irradiation. It is found that the photocatalytic activities of these catalysts are 1D CdTe@C@TiO₂-Au heteronanowires > CdTe@C@TiO₂ nanowires > pure TiO₂. Moreover, the degradation rates can reach 95.3% for CdTe@C@TiO₂-Au with 270 min of irradiation time. This outcome is attributed to the localized surface plasmon resonance (LSPR) of Au nanoparticles largely enhanced visible light absorption, the efficient photogenerated electron separation of the prepared catalyst and CdTe@C nanowires photosensitized TiO₂ structures.