Issue 2, 2012
From the journal:

CrystEngComm

Exciton quenching and ferromagnetism-to-ferrimagnetism crossover in diluted magnetic semiconducting Zn1−xCoxO nanogranular nanofibers†

Jian-Min Li,*a   Xian-Lin Zeng,a   Guo-Qian Wua  and  Zhu-An Xuab  

* Corresponding authors

a Department of Physics, Zhejiang University, Hangzhou, People's Republic of China
E-mail: phyjmli@zju.edu.cn

b State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou, People's Republic of China

Abstract

The synthesis of Co-doped zinc oxide (Zn1−xCoxO) (x = 0, 1.8, 4.4, and 7.2 at.%) nanogranular nanofibers with a diameter of 70–250 nm and length up to several hundred micrometers by electrospinning and subsequent calcinations is reported. Novel nanoscale Co2+ doping-induced phenomena were found in as-calcined electrospun Zn1−xCoxO nanofibers including (i) thermal decomposition temperature of polyvinyl alcohol (PVA) in PVA/Zn1−xCoxO electrospun composite fibers which is quite different from that of pure PVA electrospun fibers and shows a linear dependence of dopant level, (ii) exciton quenching, (iii) dimensionality-related magnetization and (iv) a room-temperature weak ferromagnetism-to-ferrimagnetism crossover. Finally, an F-centered mechanism is proposed to explain the correlating exciton quenching and the occurrence of ferrimagnetism.

Graphical abstract: Exciton quenching and ferromagnetism-to-ferrimagnetism crossover in diluted magnetic semiconducting Zn1−xCoxO nanogranular nanofibers

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Article information

DOI
https://doi.org/10.1039/C1CE06033C
Article type
Paper
Submitted
10 Aug 2011
Accepted
22 Sep 2011
First published
31 Oct 2011

CrystEngComm, 2012,14, 525-532

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Exciton quenching and ferromagnetism-to-ferrimagnetism crossover in diluted magnetic semiconducting Zn1−xCoxO nanogranular nanofibers

J. Li, X. Zeng, G. Wu and Z. Xu, CrystEngComm, 2012, 14, 525 DOI: 10.1039/C1CE06033C

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