A Novel Highly Sensitive NO(2) Sensor Based on Perovskite Na(0.5+x)Bi(0.5)TiO(3-δ) Electrolyte.
A Novel Highly Sensitive NO(2) Sensor Based on Perovskite Na(0.5+x)Bi(0.5)TiO(3-δ) Electrolyte.
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基于钙钛矿 Na0.5 xBi0.5TiO3·电解质的新型高灵敏度 NO2 传感器
DOI：
10.1038/s41598-017-05169-4
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发表时间：
2017-07-10
影响因子：
4.6
通讯作者：
Jiang L
中科院分区：
文献类型：
--
作者：
Xiao Y;Zhang C;Zhang X;Cai G;Zheng Y;Zheng Y;Zhong F;Jiang L
氮氧化物是一种危险的大气污染物，目前对氮氧化物传感器的需求非常迫切。用于NOx传感器的常规萤石相YSZ需要较高的操作温度以获得期望的氧离子电导率。本文以钙钛矿相的Na_（0.5）Bi_（0.5）TiO_3（NBT）氧导体为固体电解质，以CuO为敏感电极，Pt为参比电极，制备了一种新型的高灵敏度NO2传感器。Na掺杂的Na_（0.5）Bi_（0.5）TiO_3极大地改善了该传感器的传感性能。结果表明，Na0.51Bi0.50TiO3−δ传感器对NO2具有良好的响应-恢复特性，在400-600 °C下，响应电流与NO2浓度在50-500 ppm范围内几乎呈线性关系。在575 °C时，对NO2的响应电流值达到最大值11.23 μA，远高于其它气体（CH 4，C2 H4，C3 H6，C3 H8，CO），表明对NO2的检测具有良好的选择性。在575 °C下，共存O2浓度在2 ~ 21 vol%范围内变化时，传感器的响应信号受到轻微影响。响应电流值在2个月内仅下降了4.9%，显示出在汽车上的潜在应用。
NOx is one of dangerous air pollutants, and the demands for reliable sensors to detect NOx are extremely urgent recently. Conventional fluorite-phase YSZ used for NOx sensor requires higher operating temperature to obtain desirable oxygen ion conductivity. In this work, perovskite-phase Na0.5Bi0.5TiO3 (NBT) oxygen conductor was chosen as the solid electrolyte to fabricate a novel highly sensitive NO2 sensor with CuO as the sensing electrode and Pt as reference electrode. Na dopped Na0.5Bi0.5TiO3 greatly improved the sensing performance of this sensor. The optimal sensor based on Na0.51Bi0.50TiO3−δ exhibited good response-recovery characteristics to NO2 and the response current values were almost linear to NO2 concentrations in the range of 50–500 ppm at 400–600 °C. The response current value towards NO2 reached maximum 11.23 μA at 575 °C and the value on NO2 is much higher than other gases (CH4, C2H4, C3H6, C3H8, CO), indicating good selectivity for detecting NO2. The response signals of the sensor were slightly affected by coexistent O2 varying from 2 to 21 vol% at 575 °C. The response current value decreased only 4.9% over 2 months, exhibiting the potential application in motor vehicles.
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