期刊
CRYSTAL GROWTH & DESIGN
卷 9, 期 8, 页码 3532-3537出版社
AMER CHEMICAL SOC
DOI: 10.1021/cg900269a
关键词
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资金
- National Natural Science Foundation of China [20771061, 20871071]
- 973 program [2005CB623607]
- Applied Basic Research Programs of Science and Technology Commission Foundation of Tianjin [08JCYBJC00100 and 09JCYBJC03600]
Hierarchically three-dimensional (3D) porous ZnO architectures were synthesized by a template-free. economical hydrothermal method combined with subsequent calcination. First, a precursor of hierarchical basic zinc carbonate (BZC) nanostructures self-assembled by sheet-like blocks was prepared. Then calcination of the precursor produced hierarchically 3D porous ZnO architectures composed of interconnected ZnO nanosheets with high porosity resulting from the thermal decomposition of the precursor. The products were characterized by X-ray diffraction, Fourier tranform infrared spectroscopy, thermogravimetric-differential thermalgravimetric analysis, scanning electron microscopy, transmission electron microscopy, and Brunauer-Emmett-Teller N-2 adsorption-desorption analyses. Control experiments with variations in solvent and reaction time respectively revealed that ethanol was responsible for the formation of the BZC precursor, and the self-assembly of BZC nanosheets into hierarchically 3D architectures was highly dependent on the reaction time. Gas sensing tests showed that these hierarchically porous ZnO architectures were highly promising for gas sensor applications, as the gas diffusion and mass transportation in sensing materials were significantly enhanced by their unique structures. Moreover, it is believed that this solution-based approach call be extended to fabricate other porous Metal oxide materials with a Unique morphology or shape.
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