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Zn3(VO4)2微米球的制备及其光吸收性能
Preparation and Optical Absorption Properties of Zn3(VO4)2 Microspheres
【摘要】 以硝酸锌及偏钒酸铵为原料,采用沉淀法结合高温热处理获得了Zn3(VO4)2微米球结构。利用X射线衍射仪(XRD)、场发射扫描电子显微镜(FE-SEM)对样品的物相组成和微观结构进行了表征;通过热重-差热分析(TGDTA)对前驱体分解过程和分解温度进行了研究。结果表明:硝酸锌与偏钒酸铵混合后通过沉淀反应首先获得了Zn3V2O7(OH)2·2H2O微米球,前驱体经350℃煅烧后生成了Zn3(VO4)2微米球,该微米球由厚度约为80 nm的纳米片组装而成,推测其形成机理为各向异性生长和自组装Oswald熟化过程的结合。实验发现沉淀过程的反应温度及体系pH值对Zn3(VO4)2材料的形貌具有一定的影响作用。紫外-可见漫反射测试(UV-vis DRS)表明Zn3(VO4)2微米球在紫外光区具有较强的吸收性能,通过计算得出Zn3(VO4)2微米球的光学带隙为3.09 eV。
【Abstract】 Zn3(VO4)2microspheres were fabricated by precipitat method combined with subsequent heat treatment process using Zn(NO3)2·6H2O and NH4VO3as raw materials. The morphology and structure of the as-synthesized samples were characterized by X-ray diffraction(XRD) and scanning electron microscopy(FESEM). The thermal behavior of the precursor was investigated by TG and DTA. The results indicate that the Zn3(VO4)2microspheres could be achieved by the calcination of Zn3V2O7(OH)2·2H2O microspheres in air at 350 ℃. The microspheres are constructed by many nanosheets with a thickness of about 80 nm. Meanwhile, the intrinsic anisotropic growth nature and self-assembly-Ostwald ripening were proposed for the formation mechanism. The reaction temperature and pH value have great effect on the structures and morphologies of the products. UV-visible diffuse reflectance spectrum(UV-vis DRS) shows that the Zn3(VO4)2microspheres present strong absorption in UV light and the band gap was measured to be 3. 09 eV.
【Key words】 precipitation; Zn3(VO4)2microsphere; optical absorption; optical band gap;
- 【文献出处】 人工晶体学报 ,Journal of Synthetic Crystals , 编辑部邮箱 ,2014年04期
- 【分类号】O614.241
- 【被引频次】7
- 【下载频次】226