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. 2017 Oct 31;8:1202. doi: 10.1038/s41467-017-01210-2

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© The Author(s) 2017

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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Fig. 2 — Inkjet-printed coplanar FET on PET. a Schematic of a printed coplanar FET heterostructure. HAADF-STEM cross-sectional view of the regions in the red dashed line (b) and blue dashed line (c). Multivariate analysis of the cross section in the blue region showing non-negative matrix factorization loadings and factors (insets) (d–i). The red box in g indicates the presence of the carbon (i.e. graphene) film. j Raman Spectroscopy of the printed coplanar FET heterostructure