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Issue 33, 2015
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Oxygen vacancies and intense luminescence in manganese loaded Zno microflowers for visible light water splitting

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Abstract

ZnO nanorods and Mn/ZnO microflowers with nano-sized petals exhibit singly ionized oxygen vacancies, V+O. This is strongly supported by a green photoluminescence emission at 2.22 eV and an EPR g value of 1.953, both of which are suppressed greatly after annealing in an oxygen atmosphere. A strong red emission observed during exposure to X-rays reveals the presence of F+ centres as a consequence of the V+O. Mn/ZnO displayed enhanced H2 generation with visible light exposure, when compared to pure ZnO and annealed Mn/ZnO in the visible region, which directly correlated with the oxygen vacancy concentration. There is an interesting correlation between the intensities of the EPR lines at the g-value of 1.953 due to the oxygen vacancies, the intensity of light emitted from the exposure to X-rays, the intensity of the photoluminescence due to oxygen vacancies and the quantity of H2 produced by the photocatalytic effect when comparing the three different nanomaterials, viz. pure ZnO, Mn/ZnO before and after annealing, all having been made exactly by the same methodologies.

Graphical abstract: Oxygen vacancies and intense luminescence in manganese loaded Zno microflowers for visible light water splitting

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Supplementary files

Article information


Submitted
24 Apr 2015
Accepted
08 Jul 2015
First published
10 Jul 2015

Nanoscale, 2015,7, 13935-13942
Article type
Paper
Author version available

Oxygen vacancies and intense luminescence in manganese loaded Zno microflowers for visible light water splitting

B. Sambandam, R. J. V. Michael and P. T. Manoharan, Nanoscale, 2015, 7, 13935
DOI: 10.1039/C5NR02666K

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