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水热法制备SiO2@Mn2O3球形纳米粒子

作者:时间:2016-08-22点击数:

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 asprepared products were characterized by thermal analyzer (DSC/TG), Xray diffraction (XRD), fieldemission scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N2 adsorptiondesorption. 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:   20150522

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:16726987(2016)04041805; DOI: 10.16351/j.16726987.2016.04.013

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