CAJ | 학술논문

以ZnO纳米柱阵列为模板,采用溶胶.凝胶法制备出TiO_2/ZnO和N掺杂TiO_2/ZnO的复合纳米管阵列.扫描电镜(SEM)、X射线光电子能谱(XPS)和紫外.可见漫反射吸收光谱(UV-Vis)的结果表明:两种阵列的纳米管均为六角形结构,直径约为l00 nm,壁厚约为20 nm;在N-TiO_2/ZnO复合纳米管阵列中,掺入的N离子主要是以N-O_x、N-C和N-N的形式化学吸附在纳米管表面,仅有少量的N离子以取代式掺杂的方式占据TiO_2晶格O的位置;表面N物种形成的表面态能级和取代式掺杂导致带隙的窄化,增强了纳米管阵列的光吸收效率,促进了光生载流子的分离.光催化实验结果表明,N离子的掺杂有利于N-TiO_2/ZnO复合纳米管阵列光催化活性的提高.
이ZnO납미주진렬위모판,채용용효.응효법제비출TiO_2/ZnO화N참잡TiO_2/ZnO적복합납미관진렬.소묘전경(SEM)、X사선광전자능보(XPS)화자외.가견만반사흡수광보(UV-Vis)적결과표명:량충진렬적납미관균위륙각형결구,직경약위l00 nm,벽후약위20 nm;재N-TiO_2/ZnO복합납미관진렬중,참입적N리자주요시이N-O_x、N-C화N-N적형식화학흡부재납미관표면,부유소량적N리자이취대식참잡적방식점거TiO_2정격O적위치;표면N물충형성적표면태능급화취대식참잡도치대극적착화,증강료납미관진렬적광흡수효솔,촉진료광생재류자적분리.광최화실험결과표명,N리자적참잡유리우N-TiO_2/ZnO복합납미관진렬광최화활성적제고.
TiO_2/ZnO and N-doped TiO_2/ZnO composite nanotube arrays were synthesized by the sol-gel method using ZnO nanorod arrays as a template. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and diffuse reflectance UV-Vis spectroscopy (UV-Vis) were used to characterize the samples. The nanotubes had a uniform hexagonal shape. The diameter and wall thickness of the nanotubes were about 100 run and 20 run, respectively. Some N dopants were substitutionally doped into the TiO_2 lattice, while the N-O_x, N-C, and N-N were chemically absorbed onto the surface of the TiO_2/ZnO composite nanotubes. Dopant-induced narrowing of the bandgap resulted from the doping of N ions into the TiO_2 lattices. The surface N species enhanced the visible-light response and promoted the separation of photogenerated carriers. Compared with the TiO_2/ZnO composite nanotube arrays, the N-TiO_2/ZnO composite nanotube arrays exhibited higher photocatalytic activity.