Porous In2O3 nanospheres with high methane sensitivity: A combined experimental and first-principle study
Porous In2O3 nanospheres with high methane sensitivity: A combined experimental and first-principle study
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DOI：
10.1016/j.sna.2020.111944
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发表时间：
2020-04
影响因子：
4.6
通讯作者：
Dongping Xue;Yan Wang;Zhanying Zhang;Jianliang Cao
中科院分区：
文献类型：
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作者：
Dongping Xue;Yan Wang;Zhanying Zhang;Jianliang Cao
在低温甚至室温下检测甲烷（CH 4），具有良好的灵敏度和选择性的传感器具有重要的实际应用意义。本文采用一步水热法合成了多孔In 2 O3纳米球（NS）敏感材料，并在30 °C下实现了对CH 4的灵敏和选择性检测。所得多孔In_2O_3NS_3传感器对CH_4具有很高的灵敏度，在30 °C时的灵敏度为15.9-500 ppm。该传感器具有良好的选择性、重复性和长期稳定性。多孔In 2 O3 NSs传感器对CH 4的优异传感性能归因于其独特的结构特征。同时，为了深入研究该传感器对CH 4的气敏机理，基于密度泛函理论对In 2 O3进行了第一性原理研究.计算结果与实验得出的In 2 O3对CH 4具有较好的气敏性和选择性的结论一致，进一步证明了In 2 O3对CH 4的气敏机理受表面吸附氧模型控制。研究结果表明，多孔In 2 O3 NSs传感器在室温甲烷检测方面具有很好的应用前景。
Sensors that can detect methane (CH4) at low or even room temperature with good sensitivity and selectivity are of great significance for practical applications. Herein, porous In2O3nanospheres (NSs) sensitive materials was synthesized the via a one-step hydrothermal method to detect CH4sensitively and selectively at 30 °C. The obtained porous In2O3NSs sensor possesses high sensitivity to CH4, which is 15.9–500 ppm CH4at 30 °C. Moreover, the sensor has good selectivity, repeatability and long-term stability. The excellent sensing performance of porous In2O3NSs sensor towards CH4could be attributed to its unique structural characteristics. Simultaneously, to gain insight into the gas sensing mechanism of CH4in the sensor, the first principle study of In2O3was carried out based on density functional theory. The calculated results agree with the conclusions obtained from the experiment that In2O3has better gas sensitivity and selectivity to CH4, and further proves that the sensitive mechanism of In2O3to methane is controlled by the surface adsorbed oxygen model. All the conclusions show that porous In2O3NSs sensor has a very promising application prospect for CH4detection at room temperature.