水溶性共轭寡聚物纳米粒子的荧光淬灭

nionic water-soluble conjugated nanoparticles (OHOPE/PAA-) have been prepared through ionization of neutral polyacrylic acid-capped conjugated nanoparticles. Their fluorescence quenching properties by cationic viologen (MV2+) and anionic ferrocyanide (Fe(CN)64-) under different environments were explored through UV-vis, PL, and time resolved photoluminescent analysis. The results showed that the anionic nanoparticles could be more efficiently quenched by cationic MV2+ than by anionic Fe(CN)64-, indicating that electrostatic attraction is the driving force. Further investigation showed that the nanoparticle concentration, pH and ionic strength remarkably affected the electrostatic interaction and therefore resulted in the fluorescence quenching.