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Fluorescent sensors as a selective , high sensitivity , detection limit is low , and real - time on - line detection of trace analysis techniques due to the great interest of the majority of scientists . Currently, the most studied is the fluorescence sensor based on organic molecules and the semiconductor nano-materials ( quantum dots ) , but there is photobleaching , poor aqueous solubility , and need defects such as surface chemical modification . To solve this problem , the study found , fast response speed of the organic material , can be organically combine molecular design, excellent performance and size effect and other characteristics of nanomaterials prepared with novel optical , electrical, catalytic excellent performance organic fluorescent quantum dots . In this thesis, synthesis by Reprecipitation series of good water solubility , biocompatibility and itself contains abundant functional group mono-dispersed organic fluorescent quantum dots, and further analysis of the fluorescence detection application . Synthesis of Thiourea - thiadiazol - pyridine -type organic fluorescent quantum dots (TTP) , the fluorescence ratio in the aqueous phase of Hg2 identification , with high selectivity and sensitivity . The method of application of nanotechnology in the field of chemical sensing . On the basis of the previous study , design a capture - based DNA and target DNA capture DNA and signal transduction material competitive reaction of thiourea organic fluorescent quantum dot sensor , designed to identify groups with the signal group phase separation - molecular beacon , a preliminary study on the identification of DNA fluorescence . Synthesized a novel anionic fluorescent receptor aggregation induced fluorescence enhancement ( AIEE ) , urea derivatives ( UTB ) , reprecipitation Preparation of water-soluble of UTB fluorescent organic quantum dots , the development of a highly selective HCO3- recognition and sensitivity . Explore the mechanism of action, and a reasonable explanation . 4 having the identifying characteristics of the bicomponent triazole and thiadiazole azole (DTT) Synthesis of organic fluorescent quantum dots , and its fluorescence recognition of Ag in the first aqueous phase , the organic fluorescent quantum dots formed by DTT / Ag composite was further recognition of Cys fluorescence . Laid the foundation for the future this organic fluorescent quantum dots to identify the characteristics of the two-component sensor .
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