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 CdS 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 × 10 4 and turn-on field of 1.4 V/μm.