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. 2020 May 31;10(6):1086. doi: 10.3390/nano10061086

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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SEM images of synthesised ZnO nanomaterials using (a,b) compressed air, (c) high-purity air, (d) O₂, and (e) O₂/N₂ mixed gas. (f) Diagram shows length versus diameter of synthesised ZnO nanomaterials (NW; nanowire, TP; tetrapod, and NR (S), (L); small and large nanorods). Products were synthesised using a microwave plasma torch system at the atmospheric pressure. Reprinted with permission from [883], Copyright ©2019 Lee et al., Article licensed under a CC BY 4.0, https://creativecommons.org/licenses/by/4.0/.