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. 2018 Sep 6;8(9):693. doi: 10.3390/nano8090693

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© 2018 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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High resolution transmission electron microscopy (HRTEM) images of (a) ZnO and (b,c) ZnO/TiO₂ nanowires. The TiO₂ layer was synthesized by ALD at (b) 110°C and (c) 250 °C. The insets show high magnification images with measured d-spacings of 0.26 nm (a) and 0.35 nm (c) corresponding to the crystallographic planes of ZnO (0002) and anatase TiO₂ (101), respectively. SAED patterns in (d,e) correspond to the ZnO and ZnO/TiO₂ nanowires shown in (a,c), respectively. The inset in (e) shows the Fourier transform image of the crystalline TiO₂ shell deposited at 250 °C.