The influence of different surfactants on fluorescent properties and charge transfer of water-soluble anionic conjugated polymer poly[5-methoxy-2-(3-sulfopropoxy)-1,4-phenylenevinylene] (MPS- PPV) was investigated. Cationic and nonionic surfactants enhanced the fluorescence intensity of MPS-PPV, while anionic surfactant firstly enhanced then reduced the intensity with the increase of its concentration. Upon adding the electron acceptor Pd^2＋into MPS-PPV/surfactant system, fluorescence quenching efficiency of Pd^2＋was increased in the presence of nonionic surfactant, but the efficiency decreased in the presence of anionic or cationic surfactant. Such studies will provide guidelines to develop the novel anionic conjugated polymer-based biological and chemical sensors.

Key words: fluorescent conjugated polymer, surfactant, fluorescent property, charge transfer