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Issue 24, 2017
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Heterogeneous growth mechanism of ZnO nanostructures and the effects of their morphology on optical and photocatalytic properties

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Abstract

Zinc oxide (ZnO) nanoflowers have huge potential for various applications. However, the growth mechanism of ZnO nanoflowers is still under debate despite various growth mechanisms having been proposed. The aim of this study is to investigate the growth mechanism of different morphologies in a single sample; hopefully, this might help to understand the exact growth mechanism of ZnO nanoflowers. Herein, two models are proposed: (I) the growth mechanism of different morphologies (shapes) in a single sample; and (II) the growth mechanism of different sized ZnO flowers in a single sample. The present work also investigates the mechanism for how morphology assists in tuning the properties of nanomaterials, which is still unclear to date. New insight into the relationship between morphology and native defects has been introduced in this work. XPS, photoluminescence, and FT-IR analyses reveal the presence of oxygen vacancy defects in the structures of the materials prepared, with respect to their morphology. These defects act as self-dopants. Therefore, a change in their concentration results in tuning the band gap and thereby the photocatalytic activity.

Graphical abstract: Heterogeneous growth mechanism of ZnO nanostructures and the effects of their morphology on optical and photocatalytic properties

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Publication details

The article was received on 30 Mar 2017, accepted on 22 May 2017 and first published on 06 Jun 2017


Article type: Paper
DOI: 10.1039/C7CE00609H
Citation: CrystEngComm, 2017,19, 3299-3312
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    Heterogeneous growth mechanism of ZnO nanostructures and the effects of their morphology on optical and photocatalytic properties

    A. Hezam, K. Namratha, Q. A. Drmosh, B. N. Chandrashekar, K. K. Sadasivuni, Z. H. Yamani, C. Cheng and K. Byrappa, CrystEngComm, 2017, 19, 3299
    DOI: 10.1039/C7CE00609H

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