铂修饰的{001}面暴露的二氧化钛纳米片阵列的制备和光催化性能

采用有机溶剂热法在FTO衬底上制备{001}面暴露的单晶锐钛矿相TiO₂纳米片阵列，通过FESEM和XRD研究样品的形貌和晶体结构. 与水热法制备的纳米片阵列相比，有机溶剂热法制备的样品取向性更好. 采用光沉积方法在纳米片阵列上沉积Pt，所得到的Pt纳米颗粒粒径更为均匀，并且更容易沉积在{001}面上. 所负载的Pt 纳米颗粒增强了TiO₂纳米片的光吸收性能，同时大大减弱了光致发光强度. 在光催化性能测试中，具有最优负载量的样品催化性能提高了一倍. 与传统的Pt负载相比，{001}面的最优负载量显得相当小，这可能源于高活性{001}面的原子结构.

Pt/TiO2 Nanosheets Array Dominated by {001} Facets with Enhanced Photocatalytic Activity

{001} facets dominated single crystalline anatase TiO₂ nanosheet array (TNSA) was synthe-sized through an optimized organic solvothermal route on uorine-doped tin oxide substrate. The field emission scanning electron microscopy images and X-ray diffraction patterns re-vealed that the {001} synthesized facets dominated TNSA exhibited much higher orientation than that synthesized by hydrothermal route. The TNSAs were loaded with Pt nanoparti-cles in uniformly size by using a photodecomposition method, which were further con rmed by high resolution transmission electron microscopy (HRTEM). The HRTEM images also revealed that Pt nanoparticles preferred to deposit on {001} facets. With loading of Pt nanoparticles, the optical absorbance was significantly enhanced, while the photolumines- cence (PL) was inhibited. The photocatalytic activity of TNSA was signi cantly improved by Pt loading and reached the maximum with optimal amount of Pt loading. The optimal amount of Pt on {001} facets is far less than that on TiO₂ nanoparticles, which may be attributed to the specific atom structure of reactive {001} facets.