Nanotechnology Conference and Trade Show - Nanotech 2006
> Program > Technical Conferences > Business & Development > Nano Impact Workshop > Nanotech Job Fair > Expo
Program
Sessions
Sunday
Monday
Tuesday
Wednesday
Thursday
Index of Authors
Index of Keywords
Confirmed Speakers
Conferences & Symposia

Conference Proceedings

Conference Technical Proceedings

Structural, Optical and Magnetic Characterization of Highly Monodisperse Transition Metal-Doped ZnO Nanocrystals

O. Perales-Perez, M.S. Tomar, A. Parra-Palomino, A. Ruiz-Mendoza and W. Jia
University of Puerto Rico, Mayaguez Campus, PR

Keywords:
diluted magnetic semiconductor, spintronics, ZnO, monodisperse nanocrystals

Abstract:
The recent finding of semiconductor materials with magnetic properties has attracted the attention due to its potential applications in spintronics. We present here the results on synthesis and characterization of (TM) doped-ZnO nanocrystals, (TM=Co, Ni, Fe, Cu and Cr). Stable suspensions of these materials were produced in ethanol at room-temperature. XRD characterization of doped systems confirmed the formation of ZnO. Ni in starting solutions delayed the formation of the oxide. ZnO host structure was fully developed after 6 days of aging when the fraction of Ni in solution, ‘x’, was 0.02. HRTEM analyses revealed the high monodispersity of the 6-8 nm nanocrystals. The blue shift in UV-Vis absorption peaks of doped nanocrystals with respect to bare ZnO evidenced the inhibition of crystal growth. Room-temperature PL spectra for aged bare ZnO showed a red shift in the position of the donor-acceptor pair and the broad band peaks. This shift is a confirmation of crystal growth during aging. PL measurements for doped ZnO evidenced the dependence of the visible emission intensity with dopant concentration. The visible emission was absent for x = 0.05 in Co-doped ZnO. Doped ZnO nanocrystals were paramagnetic or weakly ferromagnetic, in contrast with diamagnetic bare ZnO.

Back to Program

Sessions Sunday Monday Tuesday Wednesday Thursday Authors

Nanotech 2006 Conference Program Abstract

 
Nanotechnology Conference | Terms of use | Privacy policy | Contact | NSTI Home
Program | Technical Conferences | Business & Development | Nano Impact Workshop | Nanotech Job Fair | Expo |
Nanotech 2006 Home | Press Room | Venue | Subscribe | Site Map
Names, and logos of other organizations are the property of those organizations and not of NSTI.
This event is not open to the general public and NSTI reserves the right to refuse admission and participation to any individual.