Selectively enhanced band gap emission in ZnO/Ag2O nanocomposites
Journal
Optics Express
Journal Volume
17
Journal Issue
6
Pages
4342-4347
Date Issued
2009
Author(s)
Abstract
A new composite consisting of ZnO nanorods decorated with Ag(2)O nanoparticles has been synthesized and characterized. It is found that the band gap emission of ZnO nanorods can be greatly enhanced by about 10 times, while the defect emission can be suppressed to the detection limit, simultaneously. The ratio between the band gap and defect emission reaches to an enhanced factor of about 600 times. The underlying mechanism is attributed to the combined effects of surface modification, band alignment, as well as charge transfer. Our approach provided here can be extended to many other semiconductors for creating nanocomposites with novel optical properties.
Type
journal article