Humidity-Independent Gas Sensors Using Pr-Doped In2O3 Macroporous Spheres: Role of Cyclic Pr3+/Pr4+ Redox Reactions in Suppression of Water-Poisoning Effect
Humidity-Independent Gas Sensors Using Pr-Doped In2O3 Macroporous Spheres: Role of Cyclic Pr3+/Pr4+ Redox Reactions in Suppression of Water-Poisoning Effect
复制标题
DOI：
10.1021/acsami.9b06386
复制
发表时间：
2019-07-17
影响因子：
9.5
通讯作者：
Lee, Jong-Heun
中科院分区：
文献类型：
--
作者：
Kim, Jun-Sik;Na, Chan Woong;Lee, Jong-Heun
纯和3-12在。采用超声喷雾热解法制备了掺Pr %的In 2 O3大孔微球，并研究了其在干燥和潮湿条件下的丙酮气敏特性，以设计与湿度无关的气体传感器。12在。% Pr掺杂的In 2 O3传感器在450 ℃下表现出与湿度变化无关的大致相同的丙酮响应和传感器电阻，而纯In 2 O3在从干燥到潮湿（相对湿度：80%）的气氛变化时表现出气敏特性的显著劣化。此外，12在。% Pr掺杂的In 2 O3传感器表现出高响应丙酮与干扰气体（NH3，CO，苯，甲苯，NO2，和H-2）在高度潮湿的气氛下可以忽略不计的交叉响应。通过X射线光电子能谱和漫反射红外傅里叶变换光谱研究了其抗湿气敏特性的机理，并结合气敏的唯象结果讨论了其与Pr 3 +/Pr 4+氧化还原对、再生氧吸附和清除羟基的关系。
Pure and 3-12 at. % Pr-doped In2O3 macroporous spheres were fabricated by ultrasonic spray pyrolysis and their acetone sensing characteristics under dry and humid conditions were investigated to design humidity-independent gas sensors. The 12 at. % Pr-doped In2O3 sensor exhibited approximately the same acetone responses and sensor resistances at 450 degrees C regardless of the humidity variation, whereas the pure In2O3 exhibited significant deterioration in gas-sensing characteristics upon the change in the atmosphere, from dry to humid (relative humidity: 80%). Moreover, the 12 at. % Pr-doped In2O3 sensor exhibited a high response to acetone with negligible cross responses to interfering gases (NH3, CO, benzene, toluene, NO2, and H-2) under the highly humid atmosphere. The mechanism for the humidity-immune gas-sensing characteristics was investigated by X-ray photoelectron and diffuse reflectance infrared Fourier transform spectroscopies together with the phenomenological gas-sensing results and discussed in relation with Pr3+/Pr4+ redox pairs, regenerative oxygen adsorption, and scavenging of hydroxyl groups.