By Topic

Surface modification of Co-doped ZnO nanocrystals and its effects on the magnetic properties

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

The purchase and pricing options are temporarily unavailable. Please try again later.
9 Author(s)
Pereira, A.S. ; Departamento de Química and CICECO, Universidade de Aveiro, P-3810-193 Aveiro, Portugal ; Ankiewicz, A.O. ; Gehlhoff, W. ; Hoffmann, A.
more authors

Your organization might have access to this article on the publisher's site. To check, click on this link: 

A series of chemically prepared Co2+-doped ZnO colloids has been surface modified either by growing shells of ZnSe or by the in situ encapsulation in poly(styrene). The surface modification effects using these two distinct chemical strategies on the magnetic properties of the nanocrystals were probed by electron paramagnetic resonance (EPR). Structural characterization by means of x-ray diffraction and transmission electron microscopy gave no evidence of second phase formation within the detection limits of the used equipment. The EPR analysis was carried out by simulations of the powderlike EPR spectra. The results confirm that in the core of these nanocrystals Co was incorporated as Co2+, occupying the Zn2+ sites in the wurtzite structure of ZnO. Additionally we identify two Co signals stemming from the nanocrystals’ shell. The performed surface modifications clearly change the relative intensity of the EPR spectrum components, revealing the core and shell signals.

Published in:

Journal of Applied Physics  (Volume:103 ,  Issue: 7 )