Enhanced room temperature ferromagnetism in electrodeposited Co-doped ZnO nanostructured thin films by controlling the oxygen vacancy defects

Autor:	S. Greulich-Weber, Harish C. Barshilia, A. Simimol, Aji A. Anappara, Prasanta Chowdhury
Rok vydání:	2015
Předmět:	Materials science Photoluminescence Condensed matter physics Dopant Doping technology industry and agriculture Analytical chemistry General Physics and Astronomy chemistry.chemical_element Concentration ratio X-ray photoelectron spectroscopy chemistry Nanorod Thin film Cobalt
Zdroj:	Journal of Applied Physics. 117:214310
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.4922050
Popis:	We report the growth of un-doped and cobalt doped ZnO nanostructures fabricated on FTO coated glass substrates using electrodeposition method. A detailed study on the effects of dopant concentration on morphology, structural, optical, and magnetic properties of the ZnO nanostructures has been carried out systematically by varying the Co concentration (c.Co) from 0.01 to 1 mM. For c.Co ≤ 0.2 mM, h-wurtzite phase with no secondary phases of Co were present in the ZnO nanostructures. For c.Co ≤ 0.2 mM, the photoluminescence spectra exhibited a decrease in the intensity of ultraviolet emission as well as band-gap narrowing with an increase in dopant concentration. All the doped samples displayed a broad emission in the visible range and its intensity increased with an increase in Co concentration. It was found that the defect centers such as oxygen vacancies and zinc interstitials were the source of the visible emission. The X-ray photoelectron spectroscopy studies revealed, Co was primarily in the divalent s...
Databáze:	OpenAIRE
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