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

Hezam, Abdo and Namratha, K. and Drmosh, Q. A. and Chandrashekar, B. N. and Kishor Kumar, S. and Yamani, Z. H. and Cheng, Chun and Byrappa, K. (2017) Heterogeneous growth mechanism of ZnO nanostructures and the effects of their morphology on optical and photocatalytic properties. CrystEngComm, 19. pp. 3299-3312. ISSN 1466-8033

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Official URL: http://dx.doi.org/10.1039/C7CE00609H

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.

Item Type: Article
Depositing User: C Swapna Library Assistant
Date Deposited: 10 Jun 2019 06:02
Last Modified: 29 Jun 2019 05:36
URI: http://eprints.uni-mysore.ac.in/id/eprint/2888

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