Preparation Of Soluble Zero-dimensional And One-dimensional Nanomaterials And Its Analytical Application-cdhgte, Au,

Quantum dots (QDs) have great applications in life science, analytical chemistry, material chemistry, immunology and so on with unique optical properties and special optoelectronic properties. Compared to conventional organic dyes, QDs possess many advantages, such as narrower emission spectra, tunable maximum emission wavelength with changeable sizes and compositions, photostability, high brightness and biocompatibility, which have been successfully used as fluorescent probe in imaging of biological samples and cells. One-dimensional (1D) nanomaterials (nanorods, nanobelts, nanotubes and nanowires) have drawn more attention particularly in view of physical and nanoapparatus applications. In the meantime, 1D semiconductor nanomaterials appears different optical properties, which have attracted more interest. The photoemission of CdSe nanorods is highly polarized along the longer axis and surface-modified CdSe/CdS/ZnS core/shell QRs as a biological label can be used in a variety of bioimaging applications. Furthermore, for single molecule fluorescence imaging, they are much brighter than QDs. Recently positively and negatively capped CdTe nanorods were directly synthesized in aqueous media, which had high quantum yields. However, little study on the synthesis of any other 1D water-soluble semiconductor nanomaterials.It is well known that Au nanoparticles have absorbance in UV region. 15nm Au nanoparticles (NPs) have a characteristic absorption band centered at 520nm with a high molar extinction coefficient (εat 520 nm). The fluorescence resonance energy transfer (FRET) process is highly efficient when there is an appreciable overlap between the emission spectrum of the CdTe QDs donor and the absorption spectrum of the Au NPs acceptor. FRET is widely used for the research in molecule structures, properties, reaction mechanism and quantitative analysis.In this study, reviews were given on the application of QDs in fluorescence analysis, the synthetic methods of 1D semiconductor materials. The novel optical properties and potential applications of 1D semiconductor materials were discussed. The application of FRET with CdTe and Au nanoparticles was also discussed. Then water-soluble alloyed CdHgTe nanorods were synthesized in aqueous media using CdTe nanorods as template. Their emission spectra were in the near-infrared and tunable according to material compositions (red-shifted with increased Hg content). The effect of pH values on the luminescence of CdHgTe nanorods were also studied. D-fructose was determined by FRET between Au nanoparticles and CdTe QDs.