Enhanced NO2 gas sensing properties of WO3 nanorods encapsulated with ZnO
Enhanced NO2 gas sensing properties of WO3 nanorods encapsulated with ZnO
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DOI：
10.1007/s00339-012-7000-9
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发表时间：
2012-05
期刊：
影响因子：
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通讯作者：
Soyeon An;Sunghoon Park;H. Ko;Chongmu Lee
中科院分区：
文献类型：
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作者：
Soyeon An;Sunghoon Park;H. Ko;Chongmu Lee
考察了ZnO包裹WO 3纳米棒对NO2气体传感性能的影响。通过两步工艺制备了WO 3-核/ZnO-壳纳米棒，该工艺包括WO 3和石墨粉末的混合物在氧化气氛中的无催化剂热蒸发和ZnO的原子层沉积。多个网络化的WO 3-核/ZnO-壳纳米棒传感器在300 °C下对5 ppm NO2的响应为281%。在5 ppm NO2下，该响应值比裸WO 3纳米棒传感器的响应值大约9倍。在相同的NO2浓度范围内，WO 3-core/ZnO-shell纳米棒的响应值比SnO 2-core/ZnO-shell纳米纤维的响应值高5倍以上。基于空间电荷模型，可以解释ZnO包覆WO 3纳米棒对NO2气体响应的显著增强。
The influence of the encapsulation of WO3nanorods with ZnO on the NO2gas sensing properties was examined. WO3-core/ZnO-shell nanorods were fabricated by a two-step process comprising the catalyst-free thermal evaporation of a mixture of WO3and graphite powders in an oxidizing atmosphere and atomic layer deposition of ZnO. Multiple networked WO3-core/ZnO-shell nanorod sensors showed the response of 281 % at 5 ppm NO2at 300 °C. This response value was approximately 9 times larger than that of bare WO3nanorod sensors at 5 ppm NO2. The response values obtained from the WO3-core/ZnO-shell nanorods in this study were more than 5 times higher than those obtained previously from the SnO2-core/ZnO-shell nanofibers at the same NO2concentration range. The significant enhancement in the response of WO3nanorods to NO2gas by encapsulating them with ZnO can be accounted for based on the space-charge model.