具有增强光催化活性的 p 型 NiO/n 型 ZnO 异质结电纺纳米纤维。
Electrospun nanofibers of p-type NiO/n-type ZnO heterojunctions with enhanced photocatalytic activity.
机构信息
Center for Advanced Optoelectronic Functional Materials Research and Key Laboratory of UV Light-Emitting Materials and Technology, Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun 130024, People's Republic of China.
出版信息
ACS Appl Mater Interfaces. 2010 Oct;2(10):2915-23. doi: 10.1021/am100618h.
One-dimensional electrospun nanofibers of p-type NiO/n-type ZnO heterojunctions with different molar ratios of Ni to Zn were successfully synthesized using a facile electrospinning technique. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance (DR) spectroscopy, resonant Raman spectroscopy, photoluminescence (PL) spectroscopy, and surface photovoltage spectroscopy (SPS) were used to characterize the as-synthesized nanofibers. The results indicated that the p-n heterojunctions formed between the cubic structure NiO and hexangular structure ZnO in the NiO/ZnO nanofibers. Furthermore, the photocatalytic activity of the as-electrospun NiO/ZnO nanofibers for the degradation of rhodamine B (RB) was much higher than that of electrospun NiO and ZnO nanofibers, which could be ascribed to the formation of p-n heterojunctions in the NiO/ZnO nanofibers. In particular, the p-type NiO/n-type ZnO heterojunction nanofibers with the original Ni/Zn molar ratio of 1 exhibited the best catalytic activity, which might be attributed to their high separation efficiency of photogenerated electrons and holes. Notably, the electrospun nanofibers of p-type NiO/n-type ZnO heterojunctions could be easily recycled without a decrease of the photocatalytic activity due to their one-dimensional nanostructural property.
一维的 p 型 NiO/n 型 ZnO 异质结的电纺纳米纤维，具有不同摩尔比的 Ni 与 Zn，是利用简便的电纺技术成功合成的。X 射线衍射（XRD）、扫描电子显微镜（SEM）、能量散射 X 射线（EDX）光谱、透射电子显微镜（TEM）、X 射线光电子能谱（XPS）、紫外-可见漫反射（DR）光谱、共振拉曼光谱、光致发光（PL）光谱和表面光电压光谱（SPS）被用来对合成的纳米纤维进行表征。结果表明，在 NiO/ZnO 纳米纤维中，立方结构的 NiO 与六方结构的 ZnO 之间形成了 p-n 异质结。此外，所电纺的 NiO/ZnO 纳米纤维对罗丹明 B（RB）的光催化降解活性远高于电纺的 NiO 和 ZnO 纳米纤维，这可以归因于 NiO/ZnO 纳米纤维中形成了 p-n 异质结。特别是，在原始 Ni/Zn 摩尔比为 1 时，p 型 NiO/n 型 ZnO 异质结纳米纤维表现出最好的催化活性，这可能是由于其光生电子和空穴的高效分离效率所致。值得注意的是，由于一维纳米结构的特性，p 型 NiO/n 型 ZnO 异质结的电纺纳米纤维可以很容易地回收，而其光催化活性没有下降。
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