Author/Authors :
Zhang، نويسنده , , Tingting and Yang، نويسنده , , Siwei and Sun، نويسنده , , Jie and Li، نويسنده , , Xiubing and He، نويسنده , , Ling and Yan، نويسنده , , Shuai and Kang، نويسنده , , Xingyuan and Hu، نويسنده , , Chenshu and Liao، نويسنده , , Fang، نويسنده ,
Abstract :
A ultra-sensitive fluorescent detection system (ppb level) for caffeine is formed by easily prepared poly(p-phenylenediamine) (PpPD) conducting polymer nanospheres. As a fluorescent sensing platform, the PpPD showed excellent selectivity, specificity and anti-interference ability. The dramatic quenching behavior in PL intensity of PpPD nanospheres when caffeine is added can be attributed to the fluorescence resonance energy transfer (FRET) procedure between PpPD and caffeine. This detection system has good stability and the probe can be applied in gentle condition. Whatʹs more, the working mechanism is also investigated by generalized gradient approximation (GGA) of density functional theory (DFT).
Keywords :
conducting polymers , Fluorescence probe , DFT , caffeine , Nanoparticles , Ultra-sensitive
