最近，在Journal of Materials Chemistry杂志上接收了一篇文章，很高兴，和大家一起共享。

http://www.rsc.org/Publishing/Journals/JM/article.asp?doi=b917739f

在本文中，以透明柔性十钨酸铕/琼脂糖薄膜为研究对象，构建了一个便携式的酸碱气体响应性发光开关。

Title:

Abstract:

Europium-containing polyoxometalates (Eu-POMs) is widely used for fabrication of the hybrid inorganic-organic luminescent materials. A few efforts have been devoted to develop active Eu-POM-based luminescent sensors and switches. In this study, highly transparent flexible self-supporting decatungsteuropate(EuW₁₀)-agarose thin films were successfully fabricated by a facile hydrogel casting technique. It was identified that strong interaction between agarose and EuW₁₀ by hydrogen bonds at the hydroxyl sites and densely-packed 3D network structure of agarose in the gel state account for the homogenous distribution of EuW₁₀, and good mechanical properties of the nanocomposite films. More importantly, the obtained thin films displayed strong red emission of Eu(III) ion, and the luminescence of these thin films was sensitive to the acid and base gases. When the thin films were exposed to HCl gas, their luminescence was sharply decreased, while the luminescence was recovered upon subsequent exposing the films to NH₃ gas. Such process could be repeated many times and a portable switch based on these thin films was proposed.