Format

Send to:

Choose Destination
See comment in PubMed Commons below
J Phys Chem B. 2007 Dec 27;111(51):14311-7. Epub 2007 Dec 4.

Microstructure control of Zn/ZnO core/shell nanoparticles and their temperature-dependent blue emissions.

Author information

  • 1Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanostructure, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, P.R. China. hbzeng@issp.ac.cn

Abstract

The microstructure of the Zn/ZnO core/shell nanoparticles synthesized by laser ablation in liquid medium can be facilely controlled. With the surfactant concentration increased over the critical micelle concentration, the nanoparticle transformed from pure ZnO to a Zn/ZnO core/shell structure. Further, with a decrease of the applied laser power, the ZnO shell thickness was monotonously reduced till 2.5 nm and the ultrafine ZnO nanocrystals embedded in the nanoshells were also reduced till 1.5 nm, which induced the increase of the disorder degree of the nanoshell lattice. The controlling mechanism was discussed according to the competition of capping protection and the oxidation reaction of laser-induced plasma. Blue photoluminescence from the ZnO nanoshells was observed. The emission band exhibited abnormal red-blue shift and narrowing with increasing temperature. Such temperature-dependent behaviors can be well described by a localization model involving an interstitial zinc defect center. These results indicate that this method provides a convenient and universal way to obtain various metal/oxide core/shell nanoparticles with controllable microstructure, and it will be beneficial to an understanding of the physical origins of the blue emission in nanostructured ZnO as well as to extending its optical and electronic applications.

PMID:
18052150
[PubMed]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for American Chemical Society
    Loading ...
    Write to the Help Desk