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Research at St Andrews

Formation mechanisms of ZnO spherulites and derivatives

Research output: Contribution to journalArticlepeer-review

Author(s)

Bethany Connolly, Heather F. Greer, Wuzong Zhou

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Abstract

ZnO microparticles have been solvothermally synthesized from zinc acetate and formic acid. The resulting microspherulites consist of radially arranged nanorods which undergo a range of re-crystallisation pathways to produce particles with different terminal morphologies. Crystallisation on the particle surface results in hex-agonal microdisc decorated hierarchical microspheres. These particles expose only the (0001) crystallographic plane of ZnO and further develop into a sea-urchin like morphology, when the microdiscs grow up along the [0001] direction into hexagonal microrods. Alternatively, crystallisation of the particle core into a ZnO plate, facilitates asymmetric assembly of nanocrystallites, forming a hexagonal cone on one side of the plate. The particle has a mushroom-like terminal morphology. When simultaneous surface and core re-crystallisation takes place, wood gyro-shaped particles are observed, in which all the surface discs face a single direction. The microstructures of the particles were investigated using XRD, electron microscopy and surface colouring with adsorbed charged dyes. Structural studies of the early growth stages and subsequent morphology evolution support a dipole field driven formation mechanism. This work offers an improved understanding of the for-mation of other spherulites, in particular, naturally occurring mineral calcium carbonate spherulites.
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Details

Original languageEnglish
Pages (from-to)249-257
Number of pages9
JournalCrystal Growth & Design
Volume19
Issue number1
Early online date3 Dec 2018
DOIs
Publication statusPublished - 2 Jan 2019

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