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. 2019 Nov 22;9:17370. doi: 10.1038/s41598-019-53960-2

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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TEM Characterization of Au NPs. (a) Particle size histogram (red) of sputtered Au NPs on a Si₃N₄ TEM grid (deposited simultaneously with ZnO NW biosensors). Particle diameter was measured and fitted with a Gaussian curve (black). (b) Low magnification TEM image of ZnO NW decorated with Au NPs. (c) HAADF-STEM image of a polycrystalline Au NP on the surface of a ZnO NW. (d) HAADF-STEM image of a single crystal Au NP on the surface of a ZnO NW. The inset FFT of the image shows spots corresponding to crystal planes from the ZnO NW (red) and Au NP (yellow). For the single crystal Au NP in (d) the Au (111) planes appears parallel to the (110) planes of ZnO.