采用静电纺丝方法制备聚乙烯吡咯烷酮(PVP)纳米纤维, 并以其为模板采用原子层沉积(ALD)方法制备不同 Mg 掺杂浓度的MgxZn1-xO纳米纤维。 研究了不同Mg掺杂浓度对复合纳米纤维结构和光学性质的影响。 利用场发射扫描电子显微镜(FESEM)、 光致发光(PL)和紫外-可见光(UV-Vis)吸收谱对样品测试并进行表征分析。 结果表明, Mg元素的掺入并没有改变ZnO纳米纤维的形貌, 所有样品的表面形貌极其相似, 只是掺杂后纤维直径有所增大;随着Mg掺杂浓度的增加吸收边逐渐发生蓝移, 表明所制备MgxZn1-xO纤维的带隙具有可调节性。 与此同时, 在PL谱中可以观察到样品的紫外(UV)发光峰从377 nm移动至362 nm, 且与不掺杂的样品相比, MgxZn1-xO纳米纤维的UV发光强度明显增强。 通过这种方法可以合成组分可控的MgxZn1-xO纳米纤维。 在ZnO中掺入Mg元素可以有效地提高ZnO-PVP纳米纤维的禁带宽度以及UV发射强度。

In the present paper, MgxZn1-xO nanofibers with different doping concentration were prepared by atom layer deposition (ALD) using polyvinyl pyrrolidone (PVP) nanofibers as template, which were synthesized by electrospinning. The influence of different Mg doping concentration on the structure and optical properties of composite nanofibers was investigated. The samples were characterized by field emission scanning electron microscopy (FESEM), ultraviolet visible (UV-Vis)absorption spectroscopy and photoluminescence (PL) spectra. The doping of Mg did not change the morphologies of ZnO nanofibers, the morphologies of all the samples were very similar while the diameter of MgxZn1-xO-PVP composite nanofibers became larger after doping. With the increase in the Mg doping concentration, the absorption edge shifted to larger energy side, revealing the band gap tenability of MgxZn1-xO nanofibers. Meanwhile, a significant blue shift of the UV emission peak from 377 to 362 nm was observed in PL spectra. Compared with ZnO-PVP composite nanofibers, the UV emission intensity of MgxZn1-xO-PVP composite nanofibers was much stronger. Component control MgxZn1-xO nanofibers can be synthesized by this method. The doping of Mg elements in ZnO can effectively improve the band gap of ZnO-PVP nanofibers and the intensity of UV emission.