Nanocrystalline SnO2 Functionalized with Ag(I) Organometallic Complexes as Materials for Low Temperature H2S Detection

Materials

Sergey Tokarev¹  Olga Fedorova¹  Anastasia Zubenko¹  Marina Rumyantseva²  Tatyana Shatalova²  Timofei Goncharov³  Abulkosim Nasriddinov³  Nikolay Khmelevsky⁴ 

[1] A.N. Nesmeyanov Institute of Organoelement Compounds RAS, 119991 Moscow, Russia;Chemistry Department, Moscow State University, 119991 Moscow, Russia;Faculty of Materials Science, Moscow State University, 119991 Moscow, Russia;LISM, Moscow State Technological University Stankin, 127055 Moscow, Russia;

关键词: metal oxide gas sensor;    nanocrystalline tin dioxide;    Ag nanoparticles;    Ag organometallic complexes;    H₂S sensor;    low temperature detection;   

DOI  :  10.3390/ma14247778

来源: DOAJ

【 摘 要 】

This paper presents a comparative analysis of H₂S sensor properties of nanocrystalline SnO₂ modified with Ag nanoparticles (AgNPs) as reference sample or Ag organic complexes (AgL1 and AgL2). New hybrid materials based on SnO₂ 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 H₂S demonstrated high sensitivity, selectivity toward other reducing gases (H₂ (20 ppm), NH₃ (20 ppm) and CO (20 ppm)) and good reproducibility of the composites in H₂S detection at low operating temperatures. The composite materials also showed a linear detection range in the concentration range of 0.12–2.00 ppm H₂S even at room temperature. It was concluded that the predominant factors influencing the sensor properties and selectivity toward H₂S in low temperature region are the structure of the modifier and the chemical state of silver. Thus, in the case of SnO₂/AgNPs reference sample the chemical sensitization mechanism is more possible, while for SnO₂/AgL1 and SnO₂/AgL2 composites the electronic sensitization mechanism contributes more in gas sensor properties. The obtained results show that composites based on nanocrystalline SnO₂ and Ag(I) organic complexes can enhance the selective detection of H₂S.

【 授权许可】

Unknown