▎ 摘　　要

A chemical sensor for metal ions was fabricated based on a water-soluble conjugated polymer-graphene oxide (GO) composite. Water-soluble poly(p-phenylene ethynylene) (PPE) with sulfonic acid side chain groups was used to prepare a very stable water-soluble PPE-GO composite with strong - interactions in water. The relationship between the optical properties and metal ion sensing capability of the PPE-GO composite in aqueous solution was investigated. Addition of metal ions enhanced the fluorescence intensity of the composite, and, in particular, the composite enabled the fluorescence detection of Cu2+ in aqueous solutions with high selectivity and sensitivity. Therefore, this conjugated polymer-GO composite sensor system was found to be an effective turn-on type chemical sensor for metal ions. Copyright (c) 2015 John Wiley & Sons, Ltd.