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首页> 外文期刊>RSC Advances >Directed synthesis, growth process and optical properties of monodispersed CaWO4 microspheres via a sonochemical route
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Directed synthesis, growth process and optical properties of monodispersed CaWO4 microspheres via a sonochemical route

机译：声化学方法指导单分散CaWO4微球的合成，生长过程和光学性质

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Monodispersed calcium tungstate (CaWO4) microspheres were synthesized successfully via a sonochemical process in deionized (DI) water. The functional group and phase formation analyses were carried out using Fourier transform infrared (FT-IR) and X-ray diffraction (XRD), respectively. XRD revealed that all samples were of pure tetragonal scheelite structure. FT-IR and Raman analysis exhibited a W-O stretching peak of molecular [WO4](2-), which related to the scheelite structure. The effect of ultrasonic irradiation times in the sonochemical process was investigated briefly for 1, 5, 15 and 30 min. The shape of the particles was revealed as spherically monodispersed with narrow size distribution and uniform features at the ultrasonic time of 5 min. This study also found that the spherical surface was composed of tightly packed nanosphere subunits. A possible mechanism for the formation of CaWO4 powders with a different ultrasonic time was discussed in detail. Optical properties showed blue light emission at a wavelength of around 420 nm and an optical energy gap (E-g) value of 3.32-3.36 eV.
机译：通过去离子（DI）水中的声化学过程成功合成了单分散钨酸钙（CaWO4）微球。分别使用傅立叶变换红外（FT-IR）和X射线衍射（XRD）进行官能团和相形成分析。 XRD显示所有样品均为纯四方白钨矿结构。 FT-IR和拉曼分析显示出分子[WO4]（2-）的W-O拉伸峰，该峰与白钨矿结构有关。在1、5、15和30分钟内简要研究了超声辐射时间在声化学过程中的影响。在5分钟的超声时间下，颗粒的形状显示为球形单分散，具有狭窄的尺寸分布和均匀的特征。该研究还发现球形表面由紧密堆积的纳米球亚基组成。详细讨论了用不同的超声时间形成CaWO4粉末的可能机理。光学性质显示出在约420 nm的波长处发出蓝光，光能隙（E-g）值为3.32-3.36 eV。

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