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Issue 39, 2020, Issue in Progress
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Bi-doping improves the magnetic properties of zinc oxide nanowires

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Abstract

Room-temperature ferromagnetism in the large and direct bandgap diluted magnetic semiconductor zinc oxide (ZnO) is attributed to the intrinsic defects and p-orbital–p-orbital (p–p) coupling interaction. However, due to oxidation, the ferromagnetism induced by defects is unstable. In the present work, the solution process synthesis route was utilized to grow pristine and bismuth-doped, highly crystalline ZnO nanowire (ZnO NW)-based samples. The FE-SEM images showed that the grown ZnO NWs have a preferred orientation along the c-axis in the (001) direction due to the anisotropic crystal nature of ZnO. X-ray photoelectron spectroscopy (XPS) confirmed the presence of Bi, and at a higher doping content, the bismuth oxide phase appeared. The XRD patterns showed the wurtzite crystal structure, and the large intensity of the (002) peak suggests that most of the reflection was from the top hexagonal face of the NWs, and thus, the wires are predominantly aligned along the c-axis. The TEM analysis further confirmed the crystal growth direction along the (001) direction. The UV-Visible absorption and PL measurements also showed a decrease in the bandgap with an increase in doping concentration, which may be associated with the sp–d exchange interaction between the localized d-electrons and band electrons of the Bi ions. Bi-doping tended to increase the PL intensity in the visible region. The magnetic properties measured by SQUID at 4 and 300 K showed ferromagnetic behaviour for both the pristine and Bi-doped samples. However, the saturation magnetization for the Bi-doped samples was higher compared to that of the pristine ZnO samples until the threshold doping value. The obtained results demonstrated that Bi-doping can be used to tune both the optical and magnetic properties of ZnO NWs, hence paving the way for future spintronics and spin-polarized optoelectronics applications.

Graphical abstract: Bi-doping improves the magnetic properties of zinc oxide nanowires

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Supplementary files

Article information


Submitted
28 Apr 2020
Accepted
03 Jun 2020
First published
18 Jun 2020

This article is Open Access

RSC Adv., 2020,10, 23297-23311
Article type
Paper

Bi-doping improves the magnetic properties of zinc oxide nanowires

J. Kazmi, P. C. Ooi, B. T. Goh, M. K. Lee, M. F. Mohd. Razip Wee, S. Shafura A Karim, S. R. Ali Raza and M. A. Mohamed, RSC Adv., 2020, 10, 23297
DOI: 10.1039/D0RA03816D

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