Synthesis and gas sensing properties of NiO/ZnO heterostructured nanowires
Synthesis and gas sensing properties of NiO/ZnO heterostructured nanowires
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DOI：
10.1016/j.jallcom.2021.160189
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发表时间：
2021-05
影响因子：
6.2
通讯作者：
Sikai Zhao;Yanbai Shen;Y. Xia;A. Pan;Zhou Li;C. Carraro;R. Maboudian
中科院分区：
文献类型：
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作者：
Sikai Zhao;Yanbai Shen;Y. Xia;A. Pan;Zhou Li;C. Carraro;R. Maboudian
在这项研究中，我们报告的NiO/ZnO异质结构纳米线的合成通过一个简单的两步液相路线和他们的气敏特性采用Au叉指电极集成在一个微型陶瓷加热器。微观结构表征表明，NiO颗粒呈絮状均匀地聚集在单晶ZnO纳米线的外表面，其直径约为50 nm，长度从500 nm到几μm不等。气敏研究表明，基于NiO/ZnO异质结构纳米线的传感器在确定的最佳工作温度300 °C下对乙醇具有高灵敏度，良好的可逆性、重现性、稳定性、对湿度的鲁棒性和快速的响应/恢复速率。有趣的是，该传感器显示出更高的乙醇响应，但更长的恢复时间相比，在空气中的N2。提出了一种乙醇传感机理来解释实验结果。
In this study, we report on the synthesis of the NiO/ZnO heterostructured nanowires by a facile two-step liquid phase route and their gas sensing characteristics employing Au interdigitated electrodes integrated on a miniature ceramic heater. Microstructural characterizations indicate that flocculent NiO particles are uniformly assembled on the outer surfaces of the single-crystalline ZnO nanowires, with diameters around 50 nm and lengths ranging from 500 nm to several μm. The gas sensing investigation indicates that the sensors based on NiO/ZnO heterostructured nanowires exhibit high sensitivity towards ethanol, good reversibility, reproducibility, stability, robustness towards humidity, and fast response/recovery rates at the determined optimum operating temperature of 300 °C. Interestingly, the sensor shows higher ethanol response but longer recovery time in N2compared with those in air. An ethanol sensing mechanism is proposed to explain the experimental results.