Nasriddinov Abulkosim, Rumyantseva Marina, Konstantinova Elizaveta, Marikutsa Artem, Tokarev Sergey, Yaltseva Polina, Fedorova Olga, Gaskov Alexander
Chemistry Department, Moscow State University, 119991 Moscow, Russia.
Faculty of Materials Science, Moscow State University, 119991 Moscow, Russia.
Nanomaterials (Basel). 2020 May 9;10(5):915. doi: 10.3390/nano10050915.
Air humidity is one of the main factors affecting the characteristics of semiconductor gas sensors, especially at low measurement temperatures. In this work we analyzed the influence of relative humidity on sensor properties of the hybrid materials based on the nanocrystalline SnO and InO and Ru (II) heterocyclic complex and verified the possibility of using such materials for NO (0.25-4.0 ppm) and NO (0.05-1.0 ppm) detection in high humidity conditions (relative humidity (RH) = 20%, 40%, 65%, 90%) at room temperature during periodic blue (λ = 470 nm) illumination. To reveal the reasons for the different influence of humidity on the sensors' sensitivity when detecting NO and NO, electron paramagnetic resonance (EPR) spectroscopy and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) investigations were undertaken. It was established that the substitution of adsorbed oxygen by water molecules causes the decrease in sensor response to NO in humid air. The influence of humidity on the interaction of sensitive materials with NO is determined by the following factors: the increase in charge carrier's concentration, the decrease in the number of active sites capable of interacting with gases, and possible substitution of chemisorbed oxygen with NO groups.
空气湿度是影响半导体气体传感器特性的主要因素之一，尤其是在低温测量时。在本工作中，我们分析了相对湿度对基于纳米晶SnO、InO和Ru（II）杂环配合物的混合材料传感器性能的影响，并验证了在室温下周期性蓝光（λ = 470 nm）照射时，使用此类材料在高湿度条件下（相对湿度（RH）= 20%、40%、65%、90%）检测NO（0.25 - 4.0 ppm）和NO（0.05 - 1.0 ppm）的可能性。为了揭示在检测NO和NO时湿度对传感器灵敏度产生不同影响的原因，进行了电子顺磁共振（EPR）光谱和漫反射红外傅里叶变换光谱（DRIFTS）研究。结果表明，水分子取代吸附氧会导致潮湿空气中传感器对NO的响应降低。湿度对敏感材料与NO相互作用的影响由以下因素决定：载流子浓度增加、能够与气体相互作用的活性位点数量减少以及化学吸附氧可能被NO基团取代。
