核壳结构AlOOH的制备、表征及其生长机制

在柠檬酸钠和硝酸铝水溶液体系中, 通过一步水热法制备了蜷缩刺猬状和核壳结构的AlOOH微球, 并用X射线衍射(XRD)、Fourier变换红外(FTIR)光谱、扫描电镜(SEM)、透射电镜(TEM)、氮气吸脱附和光致发光等分析手段对制备的样品进行了形貌和结构表征. 对反应时间、反应物浓度等影响因素进行了研究. 实验结果表明: 反应时间和反应物柠檬酸钠的浓度对所得AlOOH微球结构的尺寸和形貌具有重要影响; 蜷缩刺猬状和核壳结构AlOOH微球都具有较大的比表面积, 分别为171.5和178.6 m2·g-1; 不同形貌的AlOOH具有不同的荧光发射峰. 并初步探讨了核壳结构AlOOH微球的生长机制.

Synthesis,Characterization and Growth Mechanism of Core/Shell AlOOH Microspheres

An experimental procedure is presented for the synthesis of crouching hedgehog-like and core/shell AlOOH microspheres by a one-step hydrothermal process in an aqueous solution of trisodium citrate at 200℃.The structure,morphology,purity and size of the products were characterized by several techniques such as X-ray diffraction(XRD),transmission electron microscopy(TEM),scanning electron microscopy(SEM),nitrogen adsorption/desorption measurement and photoluminescent(PL)analysis.The reaction time and concentrations of trisodium citrate influenced the final structures and shapes of the AlOOH microspheres.Brunauer-Emmett-Teller(BET)analyses revealed high values(171.5 possible formation mechanism of core/shell AlOOH microspheres is proposed and discussed based on the reaction dynamics process and the assisted growth process.The photoluminescent spectra of these nanostructures showed different emission bands and this difference might be because of their distinct sizes and morphologies.