The following paper designed two rhodamine-based chemosensors for cysteine optical recognition. In order to decrease their photobleaching, up-conversion NaYF4 nanocrystals were used as excitation host. There was an efficient energy transfer from these NaYF4 nanocrystals to these rhodamine chemosensors, which was confirmed by spectral analysis, energy transfer radius calculation and emission decay lifetime comparison. Job's titration experiment suggested that these chemosensors followed a simple sensing mechanism towards Cys with binding stoichiometry of 1:1. Chemosensor emission was increased by Cys, showing emission turn on effect. Good selectivity and linear response were observed. It was found that sulfur modification on chemosensor improved sensitivity and selectivity.
[1]China Jiliang Univ, Coll Mech & Elect Engn, Hangzhou 310018, Zhejiang, Peoples R China;
[2]Hubei Polytech Univ, Sch Mech & Elect Engn, Huangshi 435003, Peoples R China;
[3]Fudan Univ, Dept Otorhinolaryngol, Eye Ear Nose & Throat Hosp, Shanghai 200031, Peoples R China
(8.0+极速模式)