Carbon Quantum Dot-Functionalized Aerogels for NO2 Gas Sensing

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• 作者：Ruixue Wang ; Geli Li ; Yongqiang Dong ; Yuwu Chi ; Guonan Chen
• 刊名：Analytical Chemistry
• 出版年：2013
• 出版时间：September 3, 2013
• 年：2013
• 卷：85
• 期：17
• 页码：8065-8069
• 全文大小：292K
• 年卷期：v.85,no.17(September 3, 2013)
• ISSN：1520-6882

文摘

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 m²/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.