摘要
{001}facets dominated single crystalline anatase TiO_(2)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 TiO_(2)nanoparticles,which may be attributed to the specific atom structure of reactive{001}facets.
采用有机溶剂热法在FTO衬底上制备{0Ol}面暴露的单晶锐钛矿相TiO_(2)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{OOl}面上.所负载的Pt纳米颗粒增强了TiO_(2)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,{OOl}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.
基金
This work is supported by the National Basic Research Program of China(No.2012CB9222000).
