Goncharov Timofei, Nasriddinov Abulkosim, Zubenko Anastasia, Tokarev Sergey, Shatalova Tatyana, Khmelevsky Nikolay, Fedorova Olga, Rumyantseva Marina
Faculty of Materials Science, Moscow State University, 119991 Moscow, Russia.
Chemistry Department, Moscow State University, 119991 Moscow, Russia.
Materials (Basel). 2021 Dec 16;14(24):7778. doi: 10.3390/ma14247778.
This paper presents a comparative analysis of HS sensor properties of nanocrystalline SnO modified with Ag nanoparticles (AgNPs) as reference sample or Ag organic complexes (AgL1 and AgL2). New hybrid materials based on SnO and Ag(I) organometallic complexes were obtained. The microstructure, compositional characteristics and thermal stability of the composites were thoroughly studied by X-ray diffraction (XRD), X-ray fluorescent spectroscopy (XRF), Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and Thermogravimetric analysis (TGA). Gas sensor properties to 2 ppm HS demonstrated high sensitivity, selectivity toward other reducing gases (H (20 ppm), NH (20 ppm) and CO (20 ppm)) and good reproducibility of the composites in HS detection at low operating temperatures. The composite materials also showed a linear detection range in the concentration range of 0.12-2.00 ppm HS even at room temperature. It was concluded that the predominant factors influencing the sensor properties and selectivity toward HS in low temperature region are the structure of the modifier and the chemical state of silver. Thus, in the case of SnO/AgNPs reference sample the chemical sensitization mechanism is more possible, while for SnO/AgL1 and SnO/AgL2 composites the electronic sensitization mechanism contributes more in gas sensor properties. The obtained results show that composites based on nanocrystalline SnO and Ag(I) organic complexes can enhance the selective detection of HS.
本文对用银纳米颗粒（AgNPs）作为参比样品或银有机配合物（AgL1和AgL2）改性的纳米晶SnO的气敏传感器特性进行了对比分析。获得了基于SnO和Ag（I）有机金属配合物的新型复合材料。通过X射线衍射（XRD）、X射线荧光光谱（XRF）、拉曼光谱、傅里叶变换红外（FTIR）光谱、X射线光电子能谱（XPS）和热重分析（TGA）对复合材料的微观结构、组成特征和热稳定性进行了深入研究。对2 ppm H₂S 的气敏传感器特性表明，该复合材料在低温操作下对H₂S检测具有高灵敏度、对其他还原性气体（20 ppm H₂、20 ppm NH₃和20 ppm CO）具有选择性，且具有良好的重现性。即使在室温下，复合材料在0.12 - 2.00 ppm H₂S浓度范围内也呈现线性检测范围。得出结论，在低温区域影响传感器特性和对H₂S选择性的主要因素是改性剂的结构和银的化学状态。因此，对于SnO/AgNPs参比样品，化学敏化机制更有可能，而对于SnO/AgL1和SnO/AgL2复合材料，电子敏化机制对气敏传感器特性的贡献更大。所得结果表明，基于纳米晶SnO和Ag（I）有机配合物的复合材料可增强对H₂S的选择性检测。
