| 초록 |
Cadmium Telluride (CdTe), II-VI group semiconductor nanomaterial with direct band gap of 1.45eV, has been extensively studied because of their novel optical and electrical properties for wide applications, such as photovoltaic devices, solar cells, and bio-labeling applications. Recently, fabrication of nanomaterials with a controllable size and shape has gained great interest, and composite nanostructures, especially core-shell nanostructures, have received strong attention due to their improved physical and chemical properties for electronics, magnetism, optics, and catalysis. Therefore, many approaches are being attempted to synthesize these kinds of 1-D core-shell nanostructures. One among them is a hydrothermal process, which offers significant advantages, such as chemical homogeneity, low temperature synthesis and excellent reproducibility. In this work, carbon-coated CdTe nanocables were synthesized via a facile hydrothermal method. The effects of surfactant, reaction time, temperature variation and mechanism were investigated. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), Raman spectra, ultraviolet-visible (UV-vis) absorption and photoluminescence (PL). SEM and TEM images, and Raman spectra show the existence of carbon layer on the surface of CdTe nanowire. The average diameter of CdTe core and thickness of amorphous carbon shell are ~20nm and 10nm, respectively. The characteristics of the carbon-coated CdTe nanocables will be presented and discussed in detail. |
