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Method to reduce the formation of crystallites in ZnO nanorod thin-films grown via ultra-fast microwave heating

Gray, R. J.; Jaafar, Ayoub H.; Verrelli, E.; Kemp, N. T.


R. J. Gray

Ayoub H. Jaafar

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Dr Emanuele Verrelli
Lecturer in Physics, Director of Postgraduate Researchers, Seminar organiser, First aider

N. T. Kemp


© 2018 This paper discusses the nucleation and growth mechanisms of ZnO nanorod thin-films and larger sized crystallites that form within the solution and on surfaces during an ultra-fast microwave heating growth process. In particular, the work focusses on the elimination of crystallites as this is necessary to improve thin-film uniformity and to prevent electrical short circuits between electrodes in device applications. High microwave power during the early stages of ZnO deposition was found to be a key factor in the formation of unwanted crystallites on substrate surfaces. Once formed, the crystallites, grow at a much faster rate than the nanorods and quickly dominate the thin-film structure. A new two-step microwave heating method was developed that eliminates the onset of crystallite formation, allowing the deposition of large-area nanorod thin-films that are free from crystallites. A dissolution-recrystallization mechanism is proposed to explain why this procedure is successful and we demonstrate the importance of the work in the fabrication of low-cost memristor devices.


Gray, R. J., Jaafar, A. H., Verrelli, E., & Kemp, N. T. (2018). Method to reduce the formation of crystallites in ZnO nanorod thin-films grown via ultra-fast microwave heating. Thin solid films, 662, 116-122.

Journal Article Type Article
Acceptance Date Jul 25, 2018
Online Publication Date Jul 25, 2018
Publication Date Sep 30, 2018
Deposit Date Jul 26, 2018
Publicly Available Date Oct 27, 2022
Journal Thin Solid Films
Print ISSN 0040-6090
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 662
Pages 116-122
Keywords Materials chemistry; Electronic, optical and magnetic materials; Surfaces, coatings and films; Surfaces and interfaces; Metals and alloys
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