Fe掺杂ZnO纳米薄膜的制备与光催化性能研究

Fabrication and Photocatalysis of Fe-doped ZnO Nanofilms

利用低温水热法在石墨烯涂覆的聚对苯二甲酸乙二醇酯(GPET)柔性衬底上制备了Fe掺杂ZnO(FZO)纳米复合材料。通过X射线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)对样品的晶体结构和微观形貌进行了表征。实验结果表明,Fe掺杂前后的ZnO纳米复合材料均为六方纤锌矿结构,且没有其他杂质峰出现。ZnO/GPET纳米薄膜为不规则的棒状,而Fe掺杂使其生长成横截面为正六边形的纳米棒状结构。光致发光(PL)谱表明,FZO/GPET使其电子-空穴对的复合效率大大降低。与ZnO/GPET纳米材料相比,FZO/GPET纳米复合材料具有更好的光催化活性,在紫外光照射下,对亚甲基蓝(MB)的降解率增加了7.1%。同时,对FZO/GPET的光催化机理进行分析,结果表明其光催化性能的提高得益于ZnO与Fe金属粒子的协同作用。

The Fe-doped ZnO(FZO)nanocomposites were prepared on the flexible substrate of graphene coated polyethylene terephthalate(GPET)by low temperature hydrothermal method.The crystal structure and microscopic morphology of the samples were characterized by X-ray diffractometer(XRD)and field emission scanning electron microscope(FESEM).The XRD results showed that the ZnO nanocomposites before and after Fe doping are all hexagonal wurtzite structure,and no other impurity peaks appear.The ZnO/GPET nanofilms are irregular nanorods,while Fe doping made it grow into a nanorod structure with a regular hexagonal cross section.The PL spectrum showed that FZO/GPET greatly reduced the recombination efficiency of electron-hole pairs.Compared with pure ZnO nanomaterials,FZO/GPET nanocomposites have better photocatalytic activity,and the degradation rate of methylene blue(MB)increased by 7.1%under ultraviolet light.The photocatalytic mechanism of FZO/GPET was analyzed,and the results showed that the improvement of photocatalytic performance is attributed to the synergistic effect of ZnO and Fe metal particles.