室温离子液体中超声制备纳米氧化锌掺杂材料及机理研究

在室温离子液体1-丁基-3-甲基咪唑四氟硼酸盐(ImBF_4)中超声制备镧系离子掺杂的纳米氧化锌材料,采用X射线衍射、透射电镜、光声光谱和荧光光谱技术表征样品结构和发光性能。为研究反应机理,采用甲基自由基复合法对离子液体的空化温度进行间接实测,进一步与空化动力学的数值分析结果进行比较。实验结果表明镧系离子掺杂可以有效地调控氧化锌的发光。与传统溶剂不同,离子液体空化温度不随超声时间的延长而降低,并随环境温度升高略有上升。反应机理的研究表明样品的形成生长与超声辐照和离子液体的共同作用密不可分。

A study on the ultrasonic preparation of doped zinc oxide nanomaterials in room-temperature ionic liquid and its mechanism

Lanthanide ions doped zinc oxide nanomaterials are prepared in room-temperature ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate (ImBF4) via an ultrasonic irradiation. The structure and luminescence properties of the samples are studied by X-ray diffraction, electronic transmission microscopy, photoacoustic and luminescence spectra. To study the reaction mechanism, the methyl radical recombination method is used to measure the bubble temperature in the ionic liquid, and the results are compared with the numerical analysis. The results indicate that the luminescence properties of zinc oxide can be tuned by the lanthanide doping. The cavation behavior of the ionic liquid is quite different from those of the conventional solvents. The bubble temperature of the ionic liquid does not decrease with an increase in sonication time, and increases with an increase of the environment temperature. The mechanism study indicates that the cooperation of ultrasonic irradiation and the ionic liquid plays an essential role in the formation the nanomaterials.