University of Bordeaux , Institut des Sciences Moléculaires, UMR 5255 CNRS, 351 Cours de la Libération, F-33405 Talence Cedex, France.
ACS Appl Mater Interfaces. 2014 Oct 8;6(19):17093-101. doi: 10.1021/am504723t. Epub 2014 Sep 19.
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.
双(三丙炔基锡基)丁烯的水解缩合导致了纳米结构的桥联聚锡氧烷薄膜，在 UV 处理或空气中退火后可得到二氧化锡薄膜。根据傅里叶变换红外（FTIR）光谱、接触角测量、X 射线衍射（XRD）、X 射线光电子能谱（XPS）、原子力显微镜（AFM）和扫描电子显微镜（SEM）数据，这些薄膜由聚集的“准粒子”网络组成，因为需要在 600°C 下煅烧才能形成金红石型纳米晶二氧化锡颗粒。在存在氢气和一氧化碳等还原性气体的情况下，这些薄膜产生了高度敏感、可逆和可重复的响应。在 150°C 下，这些混合薄膜对 H2 的选择性最好，而在 20-200°C 下对 CO 没有任何响应。另一方面，在 600°C 下制备的 SnO2 薄膜对 H2 的敏感性高于 CO，最佳工作温度在 300-350°C 范围内。这种有机金属方法提供了一类全新的基于 II 类有机-无机混合层的气体敏感材料，以及一种在气体敏感金属氧化物中包含有机功能的新方法。
