Preparation Of New Type Of Quantum Dots And Their Applications

The novel quantum dots (QDs) exhibited many excellent optical properties, such as:broade excitation spectrum, narrow emission spectrum, broad stokes displacement, good photostability, and so on. Recently, the synthesis of new-type ZnS-CuInS2 QDs and ZnS-AgInS2 QDs have been no reported in China. There also have been no investigation of the application of ZnS-AgInS2 QDs in China and abroad. In this paper, ZnS-CuInS2 QDs and ZnS-AgInS2 QDs with better quality have been made. We prepared water-soluble fluorescent quantum dots by modification. This is very important and significative for life sciences research. We first report the chemiluminescence properties and the application of oil-soluble ZnS-AgInS2 QDs in fluorescence analysis.This thesis consists of two parts:review and research section. The basic conception and application of QDs are reviwed in the review section. The research section contains the following four parts:一,Research on the improvement preparation of a novel high-quality ZnS-CuInS2 QDsWe substituted In(NO3)3 which is much cheaper for InI3 as raw material. High-quality ZnS-CuInS2 QDs were synthesized by metalorganic decomposition. The resultant particles were Mono-dispersedand colloidally stable. This new-type ZnS-CuInS2 QDs contain no highly toxic heavy elements. The photoluminescence wavelength of ZnS-CuInS2 QDs were adjusted by altering the ratio of content of Zn and Cu. The highest quantum yield for ZnS-CuInS2 QDs was calculated to be 24%. The yield was better than those reported in former references. Water-soluble ZnS-CuInS2 QDs were prepared by modification. This is very important and significative for life sciences research.二,Research on the improvement preparation of a novel high-quality ZnS-AgInS2 QDsHigh-quality ZnS-AgInS2 QDs were prepared by thermal decomposition of precursor power. This new-type ZnS-AgInS2 QDs contain no highly toxic heavy elements. The resulting particles exhibited broad excitation spectra and the emission color could be tuned from green to red, depending on their chemical composition. The highest quantum yield for ZnS-AgInS2 QDs was calculated to be 31%. The yield was better than those reported in former references. Water-soluble ZnS-AgInS2 QDs were prepared by modification.The modified ZnS-AgInS2 QDs have the great potential for use in life science research.三,Research on the chemiluminescence properties of ZnS-AgInS2 QDsQDs as a new type of chemiluminescence reagents is developed in recent years. In particular, it has become a hot topic in luminescence research. We study on the chemiluminescence properties of oil-soluble ZnS-AgInS2 QDs in TCPO-H2O2 chemiluminescence system.四,Research on the analytical application of ZnS-AgInS2 QDs in food safety testingWith the highest quantum yield oil-soluble ZnS-AgInS2 QDs as fluorescence probe, we propose a very simple and fast method for detecting Sudan I. Under the optimum conditions, the relative fluorescence intensity decreases linearly with the Sudan I concentration in the range from 0.01 to 1.00μg/mL, and the detection limit is 0.006μg/mL. This extend the application of QDs in food safety detection...