PDF全文下载:2016040418
孟芬芬, 郭志岩*
(青岛科技大学 材料科学与工程学院,山东 青岛266042)
摘要: 以二氧化硅微球为模板,乙酸锰和尿素为反应物,在水热条件下合成了SiO2@MnCO3中间产物,经煅烧后获得SiO2@Mn2O3。主要考察了尿素浓度、二氧化硅模板用量对中间产物形貌和结构的影响。利用热重分析仪(DSC/TG)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和氮气吸附脱附对产物进行了表征。实验结果表明:尿素浓度和二氧化硅模板的用量对产物形貌和结构有明显影响;产物煅烧前后形貌、结构变化不大,但是煅烧后产物的BET比表面积显著增大,孔径明显减小。
关键词: SiO2模板;Mn2O3; 水热法
中图分类号: O 614.7文献标志码:A
Synthesis of Spherical SiO2@Mn2O3 Nanoparticles by Hydrothermal Method
MENG Fenfen, GUO Zhiyan
(College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)
Abstract: SiO2@Mn2O3 nanoparticles have been successfully synthesized by calcination of SiO2@MnCO3 precursor that was obtained via hydrothermal method at 140 ℃ using manganese acetate and urea as the reactants, silicon dioxide as template. The asprepared products were characterized by thermal analyzer (DSC/TG), Xray diffraction (XRD), fieldemission scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N2 adsorptiondesorption. The morphologies of the hydrothermal products changed significantly with different concentration of urea and different mass of silicon dioxide. The morphologies of precursor SiO2@MnCO3 was sustained after thermal decomposition to SiO2@Mn2O3 by calcination at 560 ℃ , while the BET surface area of SiO2@Mn2O3 increased dramatically.
Key words: SiO2 template; Mn2O3; hydrothermal method
收稿日期: 20150522
基金项目: 国家自然科学基金项目(51272115).
作者简介: 孟芬芬(1990—),女,硕士研究生.*通信联系人.
文章编号:16726987(2016)04041805; DOI: 10.16351/j.16726987.2016.04.013