چكيده فارسي :
In this work, CdS QDs was synthesized using two amino acids (l-histidin and l-cysteine) as the stabilizing agents by simple method in aqueous medium.[1]Then, CdS QDs/N-methylpolypyrrole‐sodium dodecyl benzene sulfonate (CdS QDs/NMPPY‐SDBS) hybrid was synthesized via the direct polymerization of NMPY on prepared l-cysteine and l-histidine-capped CdS quantum dot aggregates.in hybrid structures, charge/energy transfer performance the quantum dot (QDs) and polymer considerably depends upon the size of the QDs and type of capping agent. In this case, l-cysteine is more suitable than l-histidine due to the short distances which increase the possibility of tunneling to occur as compared to long distances induced by bulky ligands which prevent tunneling altogether [2].The results indicate the role of SDBS to control the mechanism of synthesis, spectroscopic and sensing properties of the prepared CdS/NMPPY hybrid. Finally, because of the different and unique optoelectronic properties of synthesized CdS QDs/NMPPY‐SDBS hybrids compared with only conjugated polymer,[3]their selective and sensitive sensing activities were investigated for Picric acid (PA) that accompanied with the strong quenching of the fluorescence emission of hybrids. According to the obtained results, this could be found, although the selectivity is not dependent on the capping agents, there is a significant different in the sensitivity to PA which represents the important and essential role of the capping agents.
