TU Darmstadt / ULB / TUbiblio

Gas sensing properties of TiO2 - SnO2 nanomaterials

Lyson-Sypien, B. ; Czapla, A. ; Lubecka, M. ; Zakrzewska, K. ; Radecka, M. ; Kusior, A. ; Balogh, A. ; Lauterbach, S. ; Kleebe, H.-J. (2012)
Gas sensing properties of TiO2 - SnO2 nanomaterials.
In: 14th International Meeting on Chemical Sensors
Buchkapitel, Bibliographie

Kurzbeschreibung (Abstract)

Nanocomposites of TiO2/SnO2 for hydrogen and ammonia detection are compared with complex oxides that belong to TiO2/SnO2 system. Nanocomposites have been prepared by mechanical mixing of nanopowders with different specific surface area SSA=159 m2/g for TiO2 and SSA=21 m2/g for SnO2 as determined from BET measurements. Complex oxides have been synthesized by sol - gel method from organic precursor of TTIP and SnCl2*2H2O. The resulting SSA=91 m2/g has turned out to be larger for 50 mol % TiO2 + 50 mol % SnO2 sol-gel sample as compared with 65 m2/g for the nanocomposite of the same nominal chemical content. Nanocomposites consist of two separate phases of larger-grain (21-28 nm) cassiterite SnO2 and smaller-grain (8-11 nm) rutile TiO2, respectively, over a full compositional range. XRD and STEM suggest that a solid solution with some precipitation of SnO2 is formed for 50 mol. % TiO2 + 50 mol. % SnO2. For nanocomposites, TEM experiments reveal the presence of small, elongated TiO2 crystals and larger SnO2 crystals of irregular shape. For 50 mol.% TiO2 + 50 mol.% SnO2 sol - gel sample, spherical, homogeneously distributed grains are seen in TEM. Sensor responses exhibit a broad maximum over the compositional range at 20 - 50 mol.% of TiO2 mixed with SnO2. The electrical resistivity of 50 mol % TiO2 + 50 mol % SnO2 sol-gel sample is less affected than that of the nanocomposite of the same composition, by the exposure to H2 and NH2 at elevated temperatures.

Typ des Eintrags: Buchkapitel
Erschienen: 2012
Autor(en): Lyson-Sypien, B. ; Czapla, A. ; Lubecka, M. ; Zakrzewska, K. ; Radecka, M. ; Kusior, A. ; Balogh, A. ; Lauterbach, S. ; Kleebe, H.-J.
Art des Eintrags: Bibliographie
Titel: Gas sensing properties of TiO2 - SnO2 nanomaterials
Sprache: Englisch
Publikationsjahr: 2012
Verlag: AMA Association for Sensor Technology
Buchtitel: 14th International Meeting on Chemical Sensors
URL / URN: http://dx.doi.org/10.5162/IMCS2012/P2.7.3
Kurzbeschreibung (Abstract):

Nanocomposites of TiO2/SnO2 for hydrogen and ammonia detection are compared with complex oxides that belong to TiO2/SnO2 system. Nanocomposites have been prepared by mechanical mixing of nanopowders with different specific surface area SSA=159 m2/g for TiO2 and SSA=21 m2/g for SnO2 as determined from BET measurements. Complex oxides have been synthesized by sol - gel method from organic precursor of TTIP and SnCl2*2H2O. The resulting SSA=91 m2/g has turned out to be larger for 50 mol % TiO2 + 50 mol % SnO2 sol-gel sample as compared with 65 m2/g for the nanocomposite of the same nominal chemical content. Nanocomposites consist of two separate phases of larger-grain (21-28 nm) cassiterite SnO2 and smaller-grain (8-11 nm) rutile TiO2, respectively, over a full compositional range. XRD and STEM suggest that a solid solution with some precipitation of SnO2 is formed for 50 mol. % TiO2 + 50 mol. % SnO2. For nanocomposites, TEM experiments reveal the presence of small, elongated TiO2 crystals and larger SnO2 crystals of irregular shape. For 50 mol.% TiO2 + 50 mol.% SnO2 sol - gel sample, spherical, homogeneously distributed grains are seen in TEM. Sensor responses exhibit a broad maximum over the compositional range at 20 - 50 mol.% of TiO2 mixed with SnO2. The electrical resistivity of 50 mol % TiO2 + 50 mol % SnO2 sol-gel sample is less affected than that of the nanocomposite of the same composition, by the exposure to H2 and NH2 at elevated temperatures.

Zusätzliche Informationen:

14th International Meeting on Chemical Sensors - IMCS 2012 2012-05-20 - 2012-05-23 Nürnberg/Nuremberg, Germany

Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Geomaterialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialanalytik
Hinterlegungsdatum: 12 Okt 2012 11:52
Letzte Änderung: 03 Jun 2018 21:24
PPN:
Export:
Suche nach Titel in: TUfind oder in Google
Frage zum Eintrag Frage zum Eintrag

Optionen (nur für Redakteure)
Redaktionelle Details anzeigen Redaktionelle Details anzeigen