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室温条件下,以简单的液相法,通过改变氟源NaBF4和K2SiF6,制得不同形貌的LaF3纳米晶(片及棒束)。X射线衍射(XRD)结果显示所得的2种不同形貌的产物均为结晶良好的六方相LaF3。场发射扫描电子显微镜(FE-SEM)、透射电子显微镜(TEM)结果表明由NaBF4制得大量均匀、厚度约为20nm的六边形纳米片,而由K2SiF6得到平均直径约200nm、长度约400nm的棒束。本文详细讨论了氟源种类、反应时间、温度、反应物比例等反应参数对产物LaF3形貌的影响。提出了可能的反应机理并进一步研究了掺杂产物LaF3∶Eu3+及LaF3∶Tb3+在室温下的荧光性质。
At room temperature, different morphologies of LaF3 nanocrystals (sheets and rods) were obtained by changing the NaBF4 and K2SiF6 sources by a simple liquid-phase method. The results of X-ray diffraction (XRD) showed that the obtained two kinds of products with different morphologies were well-crystallized hexagonal LaF3. The results of field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) showed that a large number of uniform hexagonal nanosheets with a thickness of about 20 nm were obtained from NaBF4 and the average diameter was about 200 nm and the length was about 400 nm from K2SiF6 Bundle This article discussed in detail the type of fluorine source, reaction time, temperature, the proportion of reactants and other reaction parameters on the morphology of LaF3. The possible reaction mechanism was proposed and the fluorescence properties of doped LaF3:Eu3 + and LaF3:Tb3 + at room temperature were further studied.