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. 2017 Oct 6;6(10):e17057. doi: 10.1038/lsa.2017.57

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Copyright © 2017 The Author(s)

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/

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Comparison of near-field optical images of the circular graphene nanostructure before and after HNO₃ doping. The excitation wavelength was λ₀=10.70 μm. (a) Normalized near-field optical images of the pristine graphene nanostructures. (b) Normalized near-field optical images of the HNO₃-doped graphene nanostructures. (c) Extracted amplitude profiles along the dashed white line which is shown in a. The red and blue solid lines represent the profiles from the pristine and chemically doped graphene nanostructures, respectively.