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Enhancement of Lewis Acidity of Cr-Doped Nanocrystalline SnO2 : Effect on Surface NH3 Oxidation and Sensory Detection Pattern.
Garshev, Alexey V; Ivanov, Vladimir K; Krotova, Alina A; Filatova, Darya G; Konstantinova, Elizaveta A; Naberezhnyi, Daniil O; Khmelevsky, Nikolay O; Marikutsa, Artem V; Kots, Pavel A; Smirnov, Andrey V; Rumyantseva, Marina N; Gaskov, Alexander M; Krivetskiy, Valeriy V.
Afiliación
  • Garshev AV; Department of Chemistry, M. V. Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991, Moscow, Russia.
  • Ivanov VK; Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 31 Leninsky pr., Moscow, 119991, Russia.
  • Krotova AA; Department of Chemistry, M. V. Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991, Moscow, Russia.
  • Filatova DG; Department of Chemistry, M. V. Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991, Moscow, Russia.
  • Konstantinova EA; Department of Physics, M. V. Lomonosov Moscow State University, 1/2 Leninskie Gory, 119991, Moscow, Russia.
  • Naberezhnyi DO; National Research Center Kurchatov Institute, Kurchatov Square 1, 123182, Moscow, Russia.
  • Khmelevsky NO; Department of Nano-, Bio-, Information Technology and Cognitive Science, Moscow Institute of Physics and Technology, Institutskij 9, 141701, Dolgoprudny, Moscow Region, Russia.
  • Marikutsa AV; Faculty of Materials Science, M. V. Lomonosov Moscow State University, Leninskie Gory 1 bd. 73, 119991, Moscow, Russia.
  • Kots PA; LISM, Moscow State Technological University Stankin, 127055, Moscow, Russia.
  • Smirnov AV; Department of Chemistry, M. V. Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991, Moscow, Russia.
  • Rumyantseva MN; Department of Chemistry, M. V. Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991, Moscow, Russia.
  • Gaskov AM; Department of Chemistry, M. V. Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991, Moscow, Russia.
  • Krivetskiy VV; Department of Chemistry, M. V. Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991, Moscow, Russia.
Chemphyschem ; 20(15): 1985-1996, 2019 08 05.
Article en En | MEDLINE | ID: mdl-31190363
Understanding ammonia oxidation over metal oxide surfaces is crucial for improving its detection with resistive type gas sensors. Formation of NOx during this process makes sensor response and calibration unstable. Cr-doping of nanocrystalline metal oxides has been reported to suppress NO2 sensitivity and improve response towards NH3 , however the exact mechanism of such chromium action remained unknown. Herein, by using EPR spectroscopy we demonstrate formation of Cr(VI) lattice defects on the surface of nanocrystalline Cr-doped SnO2 . Enhancement of Cr-doped SnO2 surface acidity and ammonia adsorption as a result has been revealed by using in situ IR spectroscopy. Moreover, a decrease in concentration of free electrons in the conduction band has been shown as a result of substitutional Cr(III) defects formation. Weaker NOx chemisorption during ammonia oxidation over SnO2 surface after Cr doping has been found with the use of mass-spectrometry assisted NH3 thermo-programmed desorption. The given example of surface acidity adjustment and electronic configuration by means of doping may find use in the design of new gas-sensing metal oxide materials.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Diagnostic_studies Idioma: En Revista: Chemphyschem Asunto de la revista: BIOFISICA / QUIMICA Año: 2019 Tipo del documento: Article País de afiliación: Rusia Pais de publicación: Alemania
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Diagnostic_studies Idioma: En Revista: Chemphyschem Asunto de la revista: BIOFISICA / QUIMICA Año: 2019 Tipo del documento: Article País de afiliación: Rusia Pais de publicación: Alemania