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Comparison of the electronic structures of Zn1−xCoxO and Zn1−xMgxO nanorods using x-ray absorption and scanning photoelectron microscopies

Authors :
M. H. Yang
Sekhar C. Ray
J. W. Chiou
Jih-Jen Wu
S. C. Liu
Hung-Ju Lin
Chin-Pei Chen
M.-H. Tsai
H. H. Chiang
C. W. Pao
F. Z. Chien
Krishna Kumar
H. M. Tsai
Way-Faung Pong
C. H. Chen
Source :
Applied Physics Letters. 89:043121
Publication Year :
2006
Publisher :
AIP Publishing, 2006.

Abstract

X-ray absorption near-edge structure (XANES) and scanning photoelectron microscopy (SPEM) measurements have been performed for Zn1−xCoxO and Zn1−xMgxO to elucidate the effects of the doping of Co and Mg, which have very different electronegativities, on the electronic structures of ZnO nanorods. The intensities of O K-edge near-edge features in the XANES spectra of Zn1−xCoxO and Zn1−xMgxO nanorods are found to be lower than those of ZnO, which suggests that both Co and Mg substitutions of the Zn ions enhance the effective charge on the O ion. The valence-band SPEM measurements show that Mg doping does not increase the density of near-Fermi-level states, which implies that Mg doping will not improve field emission of ZnO nanorods. It is surprising to find that both Co and Mg substitutions of Zn increase the numbers of O 2p dominated valence-band states, despite that Co and Mg have larger and smaller electronegativities than that of Zn.

Details

ISSN :
10773118 and 00036951
Volume :
89
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........b1c27302a5c769608eb011ec164a1017