基于CeO/ZnO异质结的低温工作NO传感器
Low-Operating-Temperature NO Sensor Based on a CeO/ZnO Heterojunction.
作者信息
Sun Kai, Zhan Guanghui, Chen Hande, Lin Shiwei
机构信息
State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou 570228, China.
Sensor Centre, Hainan Unican Science and Technology Innovation Institute, Haikou 570228, China.
出版信息
Sensors (Basel). 2021 Dec 10;21(24):8269. doi: 10.3390/s21248269.
CeO/ZnO-heterojunction-nanorod-array-based chemiresistive sensors were studied for their low-operating-temperature and gas-detecting characteristics. Arrays of CeO/ZnO heterojunction nanorods were synthesized using anodic electrodeposition coating followed by hydrothermal treatment. The sensor based on this CeO/ZnO heterojunction demonstrated a much higher sensitivity to NO at a low operating temperature (120 °C) than the pure-ZnO-based sensor. Moreover, even at room temperature (RT, 25 °C) the CeO/ZnO-heterojunction-based sensor responds linearly and rapidly to NO. This sensor's reaction to interfering gases was substantially less than that of NO, suggesting exceptional selectivity. Experimental results revealed that the enhanced gas-sensing performance at the low operating temperature of the CeO/ZnO heterojunction due to the built-in field formed after the construction of heterojunctions provides additional carriers for ZnO. Thanks to more carriers in the ZnO conduction band, more oxygen and target gases can be adsorbed. This explains the enhanced gas sensitivity of the CeO/ZnO heterojunction at low operating temperatures.
研究了基于CeO/ZnO异质结纳米棒阵列的化学电阻传感器的低温工作特性和气体检测特性。采用阳极电沉积涂层和水热处理相结合的方法合成了CeO/ZnO异质结纳米棒阵列。基于这种CeO/ZnO异质结的传感器在低工作温度（120°C）下对NO的灵敏度比纯ZnO基传感器高得多。此外，即使在室温（25°C）下，基于CeO/ZnO异质结的传感器对NO也能快速做出线性响应。该传感器对干扰气体的反应远小于对NO的反应，表明其具有出色的选择性。实验结果表明，异质结构建后形成的内建电场使得CeO/ZnO异质结在低工作温度下具有增强的气敏性能，为ZnO提供了额外的载流子。由于ZnO导带中有更多的载流子，更多的氧气和目标气体能够被吸附。这就解释了CeO/ZnO异质结在低工作温度下气敏性增强的原因。
Zotero 插件