许多高毒性的胺类物质总是对生态环境和人类健康造成严重威胁,他们的检测很重要。在这里,通过一种新的策略构建了一种基于纤维素的双模式比色和比率荧光传感器,用于检测胺。该传感器由“负响应”指示器(Lum-MDI-CA)和“正响应”指示器(perylene四羧酸,PTCA)。Lum-MDI-CA是通过将鲁米诺连接到纤维素链上获得的,发出蓝色荧光,并在与胺接触时猝灭。Lum-MDI-CA的分子内电荷转移(ICT)提出了荧光猝灭现象的可能机制。随后,只需将Lum-MDI-CA与PTCA混合,设计了一种双模式荧光传感器,用于胺的视觉检测和分类。添加氨(NH3)时,吗啉(MOR),苄胺(BNZ),二乙胺(DEA),和三乙胺(TEA),分别,双模式传感器在紫外光和日光下显示出可见的不同颜色变化。此外,由于醋酸纤维素骨架具有优异的加工性和成型性,制备的传感器可以很容易地加工成不同的材料形式,包括墨水,涂层,电影,和纤维,仍表现出优异的荧光发射。这种基于纤维素荧光材料的传感器在防伪和信息加密方面具有重要价值。
Many amines with high toxicity always cause a serious threat to the ecological environment and human health; thus, their detection is important. Herein, a dual-mode colorimetric and ratiometric fluorescent sensor based on cellulose for detecting amines has been constructed by a new strategy. This sensor is made of a \"negative response\" indicator (Lum-MDI-CA) and a \"positive response\" indicator (perylene tetracarboxylic acid, PTCA). Lum-MDI-CA was obtained by attaching luminol onto cellulose chains, which emitted blue fluorescence and was quenched upon contact with amines. A possible mechanism of fluorescence quenching phenomenon is proposed by the intramolecular charge transfer (ICT) of Lum-MDI-CA. Subsequently, by simply mixing Lum-MDI-CA with PTCA, a dual-mode fluorescence sensor was designed for visual detection and classification of amines. When adding ammonia (NH3), morpholine (MOR), benzylamine (BNZ), diethylamine (DEA), and triethylamine (TEA), respectively, the dual-mode sensor showed visible different color changes under both UV light and daylight. In addition, owing to the excellent processibility and formability of cellulose acetate backbone, the prepared sensor can be easily processed into different material forms, including inks, coatings, films, and fibers, which still exhibit excellent fluorescence emission. Such sensors based on cellulose fluorescent materials are of great value in anti-counterfeiting and information encryption.