A carboxylated cellulose aerogel for the rapid detection of aniline vapor.
A carboxylated cellulose aerogel for the rapid detection of aniline vapor.
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尽管基于石英晶体微天平（QCM）平台的苯胺气敏材料具有优异的性能，但它们的响应速度非常慢。本文报道了一种通过2,2,6,6-四甲基哌啶-1-氧自由基（TEMPO）介导氧化均匀合成羧化纤维素气凝胶的有效方法。首次将羧化纤维素气凝胶用于基于QCM的苯胺蒸汽检测，具有响应高、选择性好、重复性和稳定性好、响应速度快（响应/恢复时间分别为13 s/8 s）的特点。利用Gaussian 09软件对传感机理进行模拟，结果表明羧化纤维素气凝胶中的羧基与苯胺中的氨基之间的弱化学吸附是主要的相互作用。这些系统的研究表明，羧化纤维素气凝胶有望成为一种良好的检测室内和室外苯胺蒸汽的传感材料。本文基于QCM传感平台，利用羧化纤维素气凝胶实现对苯胺蒸气的高效、快速传感。
Although many aniline vapor sensing materials have superior properties based on the quartz crystal microbalance (QCM) platform, they exhibit very slow response. Herein, we report an effective method to evenly synthesize carboxylated cellulose aerogels via 2,2,6,6-tetramethylpiperidine-1-oxy radical (TEMPO)-mediated oxidation. The carboxylated cellulose aerogel was first employed to detect aniline vapor based on a QCM and featured a high response, good selectivity, satisfactory repeatability and stability, and especially rapid response (the response/recovery times were 13 s/8 s, respectively). The Gaussian 09 software was used to simulate the sensing mechanism, which revealed that the weak chemical adsorption between the carboxyl group in the carboxylated cellulose aerogel and the amino group in aniline is the main interaction. These systematic studies show that the carboxylated cellulose aerogel is expected to be a good sensing material for detecting aniline vapor indoors and outdoors. Herein, a carboxylated cellulose aerogel is used to realize the efficient and rapid sensing of aniline vapor based on a QCM sensing platform.
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