原电池法室温制备Ba_(1-x)Ca_xMoO_4固溶体薄膜

在含Ca_~(2+)和Ba~(2+)的碱性溶液中,通过原电池法在室温条件下制备了Ba_(1-x)Ca_xMoO_4多晶固溶体薄膜。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和荧光分析(FA)对所制备的薄膜进行了分析表征,研究了Ba摩尔分数对薄膜的晶相结构、表面形貌和发光性能的影响。结果表明,原电池法制备的Ba_(1-x)Ca_xMoO_4薄膜致密、均匀、结晶完好,为四方相结构。随着初始溶液中Ba含量的增加,所得Ba_(1-x)Ca_xMoO_4固溶体薄膜的形貌逐渐从CaMoO_4微晶的球形转变为BaMoO_4微晶的四方锥形。在290nm紫外光的激发下,制备的薄膜均在350nm和495nm附近呈现两个宽的发射带,其中495nm的蓝光发射明显强于350nm的紫光发射。初始溶液中的Ba/Ca的量比对所制备的Ba_(1-x)Ca_xMoO_4固溶体薄膜的发射光谱的形状和发射波长影响甚微,但对其发射强度有明显影响。

Room Temperature Preparation of Ba1-xCaxMoO4 Solid Solution Thin Films by Galvanic Cell Method

Ba1-xCaxMoO4 polycrystalline solid solution films were prepared in the alkaline solution containing Ca and Ba ions via galvanic cell method at room temperature.The as-prepared films were characterized through X-ray diffraction (XRD),scanning electron microscopy (SEM),X-ray photoelectronic spectroscopy (XPS) and fluorescence analysis (FA),respectively.The influences of Ba mole fraction on the crystal structure,morphology and luminescence property were investigated.The experiment results show that the prepared Ba1-xCaxMoO4 films are uniform,dense and wellcrystallized,having a tetragonal structure.The surface morphology of the obtained Ba1-xCaxMoO4 solid solution films gradually transform from that of CaMoO4 to that of BaMoO4 with the increase of Ba content in the initial solution.Excited by 290 nm ultraviolet ray at room temperature,all the asprepared Ba1-xCaxMoO4 films show two broad emission bands centered at 350 nm and 495 nm,respectively,and the emission intensity of the band located 495 nm is obvious greater than that of the band located at 350 nm.The molar ratio of Ba/Ca has little influence on the shape and wavelength for the emission bands of the obtained Ba1-xCax MoO4 films,whereas it has markedly influence on their emission intensity.