Synthesis of hierarchical hexagonal zinc oxide/zinc aluminium hydroxide heterostructures through epitaxial growth using microwave irradiation?

CrystEngComm Pub Date: 2009-04-24 DOI: 10.1039/B902130B

Abstract

We present a simple, fast and reproducible method for synthesising zinc oxide (ZnO)/zinc aluminium hydroxide (ZnAl?:?LDH) hierarchical heterostructures with various secondary ZnO morphologies. ZnAl?:?LDHs, support materials, were synthesised by microwave irradiation at 95 °C for 20 min. Microwave-assisted secondary growth formed ZnO nanorod/ZnAl?:?LDH heterostructures through introducing the as-produced ZnAl?:?LDHs into the reaction solution. ZnO nanotube/ZnAl?:?LDH heterostructures were synthesised by aging the ZnO nanorod/ZnAl?:?LDH structures. 2D ZnO film/ZnAl?:?LDH sandwich-like heterostructures were formed by secondary ZnO growth in a citrate anion-containing solution. The secondary structures grew epitaxially and perpendicularly along the [0001] direction (c-axis orientation) on the ZnAl?:?LDH surfaces. On the basis of the results, we propose the mechanisms for the epitaxial growth of the various ZnO structures on the ZnAl?:?LDH surfaces.

Graphical abstract: Synthesis of hierarchical hexagonal zinc oxide/zinc aluminium hydroxide heterostructures through epitaxial growth using microwave irradiation
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