Li Jinwei, Liu Xin, Cui Jiashan, Sun Jianbo
†Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, P. R. China.
‡Department of Physics, Harbin Institute of Technology, Harbin 150001, P. R. China.
ACS Appl Mater Interfaces. 2015 May 20;7(19):10108-14. doi: 10.1021/am508121p. Epub 2015 May 8.
Hierarchical self-assembled hollow spheres (HS) of tungsten oxide nanosheets have been synthesized via a template-free hydrothermal method. Morphology evolution of the products is determined by the amount of H2C2O4 (oxalic acid) which serves as chelating agent. Structural features of the products were characterized by X-ray diffraction (XRD), and morphology was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). In addition, the porous structure was analyzed using the Brunauer-Emmett-Teller (BET) approach. The synthesis mechanism of the products with self-assembled hierarchical structures was proposed. The NO2 gas sensing properties of self-assembled hierarchical WO3 HS materials were investigated, the gas sensing properties of WO3 synthesized by a variety of formulations were compared, and the possible gas sensing mechanism was discussed. The obvious enhancement of the gas sensing properties was ascribed to the structure of the hierarchical HS.
通过无模板水热法合成了氧化钨纳米片的分级自组装空心球（HS）。产物的形貌演变由用作螯合剂的H2C2O4（草酸）的量决定。通过X射线衍射（XRD）对产物的结构特征进行了表征，并通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）研究了形貌。此外，使用布鲁诺尔-埃米特-特勒（BET）方法分析了多孔结构。提出了具有自组装分级结构的产物的合成机理。研究了自组装分级WO3 HS材料的NO2气敏性能，比较了多种配方合成的WO3的气敏性能，并探讨了可能的气敏机理。气敏性能的明显增强归因于分级HS的结构。
