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. 2014 Apr 15;4:4605. doi: 10.1038/srep04605

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. The images in this article are included in the article's Creative Commons license, unless indicated otherwise in the image credit; if the image is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the image. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/

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(a) SEM image of SiO₂ NTs. (b) EDS spectra of SiO₂ NTs on selected region (yellow rectangle) of image a. (c–d) show the EDS microanalysis of element Si and O for this selected region. Scale bar: 5 μm. (e–f) EDS quantitative analysis of selected region.