Preparation Of Cdte Nano Quantum Wire Fluorescent Probes, The Nature And Analysis Of Applied Research

Nanostructured semiconductor materials with unique optical properties have generated great research interest in the past two decades. Most attention has been paid to quantum dots (QDs). Compared to conventional organic dyes, sufficiently passivated QDs appear to be less susceptible to photobleaching with much narrower emission spectra and tunable maximum emission wavelength, which have been successfully used as fluorescent QWss in imaging of biological samples and cells. If not well passivated, the luminescence of the QDs becomes very sensitive to their local environment, and detections of some inorganic ions, proteins, DNA conformations were developed based on this property. Owing to the quite different quantum confinement energies, one-dimensional (1D) nanostructures present some novel optical properties different from zero-dimensional nanostructures. For example, functionalized carbon nanotubes possess near-infrared fluorescence and they have been successfully employed as biological molecular transporters and imaging agents in cells. The photoemission of CdSe nanorods is highly polarized along the longer axis and the fluorescence spectra of CdTe quantum wires (QWs) assembled from nanoparticles red-shifted 20nm with higher quantum yield. Recently, the syntheses of luminescent CdSe nanorod-DNA complex and biological assembly of nanocircuit prototypes from protein-modified CdTe nanowires attracted extensive attention. Nevertheless, exploration of 1D semiconductor materials as fluorescent sensors for biological samples and cells remains at a very early stage. This is partially due to the difficulties with the dispersion of these nanomaterials in water. In this study, reviews were given firstly on the application of QDs in fluorescence analysis and the synthetic methods of 1D semiconductor materials. The novel optical properties and potential applications of 1D semiconductor materials were discussed. Then, highly luminescent water-soluble CdTe QWs were synthesized in one step. The...