title: Hybrid organotin and tin oxide-based thin films processed from alkynylorganotins: synthesis, characterization, and gas sensing properties.
abstract: Hydrolysis-condensation of bis(triprop-1-ynylstannyl)butylene led to nanostructured bridged polystannoxane films yielding tin dioxide thin layers upon UV-treatment or annealing in air. According to Fourier transform infrared (FTIR) spectroscopy, contact angle measurements, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and scanning electron microscopy (SEM) data, the films were composed of a network of aggregated "pseudo-particles", as calcination at 600 °C is required to form cassiterite nanocrystalline SnO2 particles. In the presence of reductive gases such as H2 and CO, these films gave rise to highly sensitive, reversible, and reproducible responses. The best selectivity toward H2 was reached at 150 °C with the hybrid thin films that do not show any response to CO at 20-200 °C. On the other hand, the SnO2 films prepared at 600 °C are more sensitive to H2 than to CO with best operating temperature in the 300-350 °C range. This organometallic approach provides an entirely new class of gas-sensing materials based on a class II organic-inorganic hybrid layer, along with a new way to include organic functionality in gas sensing metal oxides.
authors.affiliation: University of Bordeaux , Institut des Sciences Moléculaires, UMR 5255 CNRS, 351 Cours de la Libération, F-33405 Talence Cedex, France.
authors.forename: Laetitia
authors.initials: L
authors.lastname: Renard
authors.forename: Joachim
authors.initials: J
authors.lastname: Brötz
authors.forename: Hartmut
authors.initials: H
authors.lastname: Fuess
authors.forename: Aleksander
authors.initials: A
authors.lastname: Gurlo
authors.forename: Ralf
authors.initials: R
authors.lastname: Riedel
authors.forename: Thierry
authors.initials: T
authors.lastname: Toupance
keywords: gas sensors; organic−inorganic hybrid materials; organotins; thin films; tin dioxide