GONG Wei-wei, ZHENG Zhu-hong, ZHENG Jin-ju, ZHAO Hai-feng, REN Xin-guang. A Physical Method for Fabrication of Water-soluble CdS Nanoparticles:Femtosecond Laser Ablation[J]. Chinese Journal of Luminescence, 2008,29(6): 1041-1044
GONG Wei-wei, ZHENG Zhu-hong, ZHENG Jin-ju, ZHAO Hai-feng, REN Xin-guang. A Physical Method for Fabrication of Water-soluble CdS Nanoparticles:Femtosecond Laser Ablation[J]. Chinese Journal of Luminescence, 2008,29(6): 1041-1044DOI:
Water-soluble CdS nanoparticles have been prepared by femtosecond laser(100 fs
800 nm
FL)ablation of a bulk CdS target in water.Being performed in a controllable contamination-free environment
this method makes possible the production of nanomaterials without impurities.The morphology and the optical characteristics were studied through transmission electronic microscopic
UV-Vis optical absorption
and room temperature photoluminescence.The results indicated that the obtained water soluble CdS quantum dots fabricated by femtosecond laser ablation have small size and narrow size distribution.As well
these quantum dots were found to be exceptionally stable in air for at least 6 months.In addition
under the excitation of 300 nm
the photoluminescence of the CdS quantum dots ablated in water shows a band-edge emission peaked at 420 nm with FWHM of 62 nm.The above-mentioned characteristics make these CdS nanoparticles of great attraction for potential application in biological labeling.This work demonstrates that the FL ablation is a simple but effective method for preparation of high quality quantum dots.