Specific recognition of ultratrace levels of ions in semi-water using super-quicker methods is still a challenge for environmental monitoring.Herein we report a fluorescent and colormetric sensor (ZH) based on supramolecular self-assembly,whose structure was destroyed by the addition of ultratrace of silver ions.The process promoted either naked eye visible color changes or fluorescence intensity quenched in conjunction with a wide pH range.Systematic studies revealed very high selectivity (0.07 μmol/L) for silver ions,and other common cations,e.g.,Hg2+,Cu2+,Cd2+,Pb2+ had nearly no influence on the sensing behavior.This sensor also served as a multiple use of component in sensing materials by addition of I-into the mixture of ZH and Ag+ (about 5 times).What's more,ZH containing filter paper emerged distinct color and fluorescence changes upon exposure to silver (Ag+),which could be used as a portable method to undertake field testing for Ag+.
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