| The light-emitting semiconductor nanocrystals, also known as quantum dots (QDs). It’s width absorption spectral, the emission spectra narrow and symmetrical. It can emit different colors of light by adjusting the composition and size. It have higher fluorescence intensity and light stability, and overcome many insufficient of the traditional organic dyes. In recent years, with the deepening studying of the quantum dots, the applications has been extended to the quantitative analysis of heavy metal ions, small organic molecules, drugs, and made great progress. The research content has been divided into two chapters:Chapter one:This paper introduces nanometer particles, quantum dots and quantum dots of the concept, classification and their respective characteristics. And introducd the application of the quantum dots and quantum dots combining with domestic and foreign present situation. Based on this, this paper reviewed the synthesis methods of quantum dots and preparation methods of doped semiconductor nanocrystals.Chapter two:This dissertation has studied The CdTe semiconductor quantum dots were synthesized in water with3-Mercaptopropionic acid (MPA) as stabilizer at a constant temperature of90℃. The CdTe quantum dot s were used as fluorescence probes for t he quantitative determination of t race amount s of Hg (Ⅱ) ions based on t he evident quenching action of Hg2+on t he fluorescence of QDs. The result showed in the best experimental conditions, the degree of fluorescence quenching was linear wit h Hg (Ⅱ) mass concent ration in t he range of2×10-10～4×10-9mol/L with a linear correlation coefficient of0.9938. The detection limit was0.9847×10-12mol·L-1. The RSD was5.43%, the recovery rate was between90%and105%. |
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