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Organic-Inorganic Hybrid Materials for Room Temperature Light-Activated Sub-ppm NO Detection

1
Chemistry Department, Moscow State University, Moscow 119991, Russia
2
Faculty of Materials Science, Moscow State University, Moscow 119991, Russia
3
A.N. Nesmeyanov Institute of Organoelement Compounds RAS, Moscow 119991, Russia
4
LISM, Moscow State Technological University Stankin, Moscow 127055, Russia
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(1), 70; https://doi.org/10.3390/nano10010070
Received: 23 November 2019 / Revised: 16 December 2019 / Accepted: 24 December 2019 / Published: 28 December 2019
(This article belongs to the Special Issue Nanostructured Gas Sensors)
Nitric oxide (NO) is one of the main environmental pollutants and one of the biomarkers noninvasive diagnosis of respiratory diseases. Organic-inorganic hybrids based on heterocyclic Ru (II) complex and nanocrystalline semiconductor oxides SnO2 and In2O3 were studied as sensitive materials for NO detection at room temperature under periodic blue light (λmax = 470 nm) illumination. The semiconductor matrixes were obtained by chemical precipitation with subsequent thermal annealing and characterized by XRD, Raman spectroscopy, and single-point BET methods. The heterocyclic Ru (II) complex was synthesized for the first time and characterized by 1H NMR, 13C NMR, MALDI-TOF mass spectrometry and elemental analysis. The HOMO and LUMO energies of the Ru (II) complex are calculated from cyclic voltammetry data. The thermal stability of hybrids was investigated by thermogravimetric analysis (TGA)-MS analysis. The optical properties of Ru (II) complex, nanocrystalline oxides and hybrids were studied by UV-Vis spectroscopy in transmission and diffuse reflectance modes. DRIFT spectroscopy was performed to investigate the interaction between NO and the surface of the synthesized materials. Sensor measurements demonstrate that hybrid materials are able to detect NO at room temperature in the concentration range of 0.25–4.0 ppm with the detection limit of 69–88 ppb. View Full-Text
Keywords: organic–inorganic hybrid materials; tin dioxide; indium oxide; Ru (II) complex; nitrogen monoxide NO; semiconductor gas sensor; room temperature; visible light activation organic–inorganic hybrid materials; tin dioxide; indium oxide; Ru (II) complex; nitrogen monoxide NO; semiconductor gas sensor; room temperature; visible light activation
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Nasriddinov, A.; Rumyantseva, M.; Shatalova, T.; Tokarev, S.; Yaltseva, P.; Fedorova, O.; Khmelevsky, N.; Gaskov, A. Organic-Inorganic Hybrid Materials for Room Temperature Light-Activated Sub-ppm NO Detection. Nanomaterials 2020, 10, 70.

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