Pt/TiO_(2) Nanosheets Array Dominated by {001} Facets with Enhanced Photocatalytic Activity  

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

作　　者：Feng Li Zheng-ping Fu Ya-lin Lu 李峰;傅正平;陆亚林(中国科学技术大学材料科学与工程系,中科院能量转换材料重点实验室,合肥230026;中国科学技术大学合肥微尺度物质科学国家实验室(筹),合肥230026)

机构地区：[1]CA5 Key laboratory of Materials for Energy Conversion,Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China [2]National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Journal of Chemical Physics》2014年第5期530-534,I0003,共6页化学物理学报(英文)

基　　金：This work is supported by the National Basic Research Program of China(No.2012CB9222000).

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.

关 键 词：Organic solvothermal route PHOTODECOMPOSITION TiO_(2) Nanosheet array {001}facet 

分 类 号：O[理学]