一维α-Bi_2O_3纳米线的合成及光性能

Synthesis ofα-Bi_2O_3 nanowires by solution precipitation method and optical properties

采用溶液沉淀法,以丙酮-水为复合溶剂、正庚烷为油相,在油酸为封端剂的辅助下,在常温常压下高效便捷地合成出了一维α-Bi_2O_3纳米线。采用X射线衍射(XRD)和场发射扫描电子显微镜(FE-SEM)对产物进行了表征。合成的纳米线直径为50~100nm,长约10μm,长径比为100~200,表面清晰光滑。机理分析表明,油酸在纳米线的形成过程中起着至关重要的作用。紫外-可见光(UV-Vis)吸收光谱表明其在小于455nm的紫外-可见光波段具有明显的光吸收,荧光(PL)光谱表明其在400~600nm具有宽的发射谱带。

At room temperature and ambient atmospheric pressure,one dimensionα-Bi2O3 nanowires were synthesized successfully by solution precipitation method,an efficient and convenient route,in the acetone-water mixed solvent system with the assistance of oleic acid（capping agent）and n-heptane（oil phase）.X-ray diffraction（XRD）and field-emission scanning electron microscope（FE-SEM）were employed to characterize the obtained products,which were 50-100 nm in diameter,10μm in length,and with aspect ratio of 100-200.Mechanism analysis shows that oleic acid as capping agent plays an important role in the growth control of nanowires.According to the UV-visible diffuse reflectance spectrum,the as-preparedα-Bi2O3 nanowires present photo-absorption property from UV light region to visible light range（shorter than 455 nm）.The fluorescence spectrum shows broad emission（400-600 nm）.