Micro Systems Technology Center, ITRI South, Industrial Technology Research Institute, Tainan 709, Taiwan.
Sensors (Basel). 2010;10(4):3057-72. doi: 10.3390/s100403057. Epub 2010 Mar 30.
The application of novel core-shell nanowires composed of ZnGa2O4/ZnO to improve the sensitivity of NO2 gas sensors is demonstrated in this study. The growth of ZnGa2O4/ZnO core-shell nanowires is performed by reactive evaporation on patterned ZnO:Ga/SiO2/Si templates at 600 °C. This is to form the homogeneous structure of the sensors investigated in this report to assess their sensitivity in terms of NO2 detection. These novel NO2 gas sensors were evaluated at working temperatures of 25 °C and at 250 °C, respectively. The result reveals the ZnGa2O4/ZnO core-shell nanowires present a good linear relationship (R2>0.99) between sensitivity and NO2 concentration at both working temperatures. These core-shell nanowire sensors also possess the highest response (<90 s) and recovery (<120 s) values with greater repeatability seen for NO2 sensors at room temperature, unlike traditional sensors that only work effectively at much higher temperatures. The data in this study indicates the newly-developed ZnGa2O4/ZnO core-shell nanowire based sensors are highly promising for industrial applications.
本研究展示了由 ZnGa2O4/ZnO 组成的新型核壳纳米线在提高 NO2 气体传感器灵敏度方面的应用。通过在 600°C 的图案化 ZnO:Ga/SiO2/Si 模板上进行反应蒸发来生长 ZnGa2O4/ZnO 核壳纳米线，以形成本报告中研究的传感器的均匀结构，从而评估它们在 NO2 检测方面的灵敏度。这些新型 NO2 气体传感器分别在 25°C 和 250°C 的工作温度下进行了评估。结果表明，在两种工作温度下，ZnGa2O4/ZnO 核壳纳米线的灵敏度与 NO2 浓度之间均呈现出良好的线性关系（R2>0.99）。与传统传感器相比，这些核壳纳米线传感器在室温下具有更高的响应值（<90 s）和恢复值（<120 s），并且具有更好的重复性，而传统传感器仅在更高的温度下才能有效工作。本研究的数据表明，新开发的基于 ZnGa2O4/ZnO 核壳纳米线的传感器非常有希望用于工业应用。
