Novel CdS nanostructures: Synthesis and field emission

Here, we reported the success in the synthesis of novel CdS nanostructures, nanotubes, core-sheath nanowires, and tube-wire nanojunctions, by thermal evaporation of US powder and purposed a model for the growth mechanism. The core-sheath nanowires consist of a crystalline core and amorphous sheath. The photoluminescence characterization indicated that the CdS nanostructures were crystalline and showed a narrow peak at 516.5 nm. In addition, the CdS nanostructures exhibited better field emission properties with a field enhancement factor of 1.5 x 10(4) and turn-on field of 1.4 V/mu m.