Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, and Department of Chemistry, Fuzhou University, Fujian 350108, China.
Anal Chem. 2013 Sep 3;85(17):8065-9. doi: 10.1021/ac401880h. Epub 2013 Aug 14.
Silica aerogels functionalized with strongly fluorescent carbon quantum dots were first prepared and used for simple, sensitive, and selective sensing of NO2 gas. In the presence of ethanol, homemade silica aerogels with a large specific surface area of 801.17 m(2)/g were functionalized with branched polyethylenimine-capped quantum dots (BPEI-CQDs) with fluorescence quantum yield higher than 40%. The prepared porous CQD-aerogel hybrid material could maintain its excellent fluorescence (FL) activity in its solid state. The FL of CQD-aerogel hybrid material could be selectively and sensitively quenched by NO2 gas, suggesting a promising application of the new FL-functionalized aerogels in gas sensing.
首先制备了功能化的具有强荧光碳量子点的硅气凝胶，并将其用于简单、灵敏和选择性检测 NO2 气体。在乙醇存在下，用具有比荧光量子产率高于 40%的支化聚乙烯亚胺封端的量子点（BPEI-CQDs）功能化的比表面积为 801.17 m2/g 的大比表面积的自制硅气凝胶。制备的多孔 CQD-气凝胶杂化材料在固态下仍能保持其优异的荧光（FL）活性。NO2 气体可选择性和灵敏地猝灭 CQD-气凝胶杂化材料的 FL，表明新型 FL 功能化气凝胶在气体传感方面有很好的应用前景。
