Polymer-korea | 2019
Turn-On Detection of Cs Ions Based on Conjugated Polymer-Graphene Oxide Composite
Abstract
New type of “turn-on” fluorescent sensor for Cs ion was developed using a composite of blue-emissive conjugated polymer (CP) and graphene oxide (GO). Ethylene glycol units were introduced to the side chain of CP, which \ncould interact with Cs ions. The CP and GO formed a stable, nonfluorescent composite, because of hydrophobic and ππ interactions between them. In the presence of Cs ions, the CP was released from the CP-GO composite because of \nhigher affinity of Cs ions with ethylene glycol units in the CP. Such a weaker interaction between CP and GO led to the \nrecovery of initial blue fluorescence of the CP. The degree of fluorescence restoration would be a measure of the concentration of Cs ions. Thus, fluorescence “turn-on” from CP-GO was attributed to the presence of Cs ions.