Ji Xiaofan, Chen Wei, Long Lingliang, Huang Feihe, Sessler Jonathan L
Department of Chemistry , The University of Texas at Austin , 105 East 24th Street, Stop A5300 , Austin , Texas 78712 , USA . Email:
School of Chemistry and Chemical Engineering , Jiangsu University , Zhenjiang , Jiangsu 212013 , P. R. China . Email:
Chem Sci. 2018 Aug 30;9(40):7746-7752. doi: 10.1039/c8sc03463j. eCollection 2018 Oct 28.
Reported here is a two-layer gel construct that permits the on-site detection of the chloride anion by means of a hand-held UV-vis lamp and a smart phone "app". To prepare this system, eight fluorescent polymeric gels G1-G8 were synthesized. Gels G1-G4 containing C4P/imidazolium-F anion recognition motifs were used to construct a fluorescent pattern (Code A) that may be read out by a smart phone as a 3D color code (Info A). Gels G5-G8, which are based on C4P/imidazolium-Br anion interactions, were used to construct an array (Code B) that may be read as Info B. Code B was then adhered to the surface of Code A to produce an adhered double layer code system stabilized by interfacial C4P/imidazolium-Br anion interactions. Readout of the top layer (Code B) could be achieved without interference from Code A. Treatment with a Cl anion source was found to delaminate the top layer and leave intact the more robust bottom layer, allowing the bottom layer (Code A) to be read out. The disparate information content associated with Codes A and B thus permits the on-site recognition of Cl. The present sensing strategy does not rely on elaborate instrumentation and could provide a new application for elaborated soft materials.
本文报道了一种双层凝胶结构，它能够通过手持式紫外可见灯和智能手机“应用程序”对氯离子进行现场检测。为制备该系统，合成了八种荧光聚合物凝胶G1-G8。含有C4P/咪唑鎓-F阴离子识别基序的凝胶G1-G4用于构建一种荧光图案（代码A），该图案可被智能手机读取为三维颜色代码（信息A）。基于C4P/咪唑鎓-Br阴离子相互作用的凝胶G5-G8用于构建一个阵列（代码B），该阵列可被读取为信息B。然后将代码B粘附到代码A的表面，以产生通过界面C4P/咪唑鎓-Br阴离子相互作用稳定的粘附双层代码系统。顶层（代码B）的读取可以在不受代码A干扰的情况下实现。发现用Cl阴离子源处理会使顶层分层，而更坚固的底层保持完整，从而可以读取底层（代码A）。与代码A和B相关的不同信息内容因此允许对Cl进行现场识别。目前的传感策略不依赖于精密仪器，可为精细软材料提供新的应用。
