Synthesis and enhanced gas sensing properties of flower-like SnO2 hierarchical structures decorated with discrete ZnO nanoparticles
Synthesis and enhanced gas sensing properties of flower-like SnO2 hierarchical structures decorated with discrete ZnO nanoparticles
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离散 ZnO 纳米颗粒装饰的花状 SnO2 分级结构的合成和增强气敏性能
DOI：
10.1016/j.jallcom.2014.07.198
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发表时间：
2014-12
影响因子：
6.2
通讯作者：
Zhang, Zhanying
中科院分区：
文献类型：
--
作者：
Bala, Hari;Wang, Xiaodong;Jia, Tiekun;Zhang, Zhanying
采用溶剂热法预先制备花状SnO纳米片，然后以其为牺牲模板，通过Zn（CH 3COO）2·2 H2O退火，成功制备了不同ZnO含量的花状ZnO/SnO 2复合材料。通过退火处理，花状SnO在不改变形貌的情况下被氧化为SnO 2，同时在片状SnO 2花瓣表面修饰出尺寸约为10-50 nm的ZnO纳米粒子（NPs）。ZnO纳米粒子的分散性与ZnO/SnO 2复合材料中ZnO的含量密切相关。研究了不同ZnO含量的ZnO/SnO 2复合材料的气敏性能。所述复合物具有10重量%的ZnO对乙醇的灵敏度明显高于纯SnO 2和掺杂5 wt.%的复合材料和15重量% ZnO含量讨论了ZnO纳米颗粒和ZnO/SnO 2异质结对ZnO/SnO 2复合材料气敏性能的影响。
Flower-like ZnO/SnO2hierarchical structures with different ZnO contents were successfully prepared via a flexible two-step synthesis method, in which nanosheets-assembled flower-like SnO microstructures were prepared in advance through a solvothermal method, and then were used as sacrificial templates to prepare ZnO/SnO2composites by annealing with Zn(CH3COO)2⋅2H2O. Through the annealing process, the as-prepared flower-like SnO was oxidized to SnO2without changing the morphology, and ZnO nanoparticles (NPs) with the size about 10–50 nm were simultaneously decorated on the surface of sheet-like SnO2petals. The dispersion of ZnO NPs was found to have a close relationship with the ZnO content of ZnO/SnO2composite. The gas sensing properties of the prepared ZnO/SnO2composites with different ZnO contents were investigated. The composite with 10 wt.% ZnO exhibits remarkably higher sensitivity to ethanol than the pure SnO2and the composites with 5 wt.% and 15 wt.% ZnO contents. The influences of ZnO NPs and ZnO/SnO2heterojunctions on the gas sensing properties of ZnO/SnO2composites were discussed.
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