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. 2019 Jan 22;9:276. doi: 10.1038/s41598-018-36746-w

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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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(a) Binding of chl-Abs with BSA, and chl-BSA. The concentration of Chl-Abs was 0.1 μg/mL; (b) R of graphene channel showed a dip when reacting with 1% BSA in PB. (c) The change in resistance was recorded on the gold surface without graphene does not show antibody binding, reconfirmed that signal obtained from graphene network; (d) Calibration curve resultant from the immunoreactions showed the % R as a function of time for different concentrations of chl-Ag. (e) Schematic representation of Chl-Abs-gra-FET sensor; Kinetic response from the gra-FET at each step and after exposure of free chl at different concentrations: (i) 1 fM (ii) 10 fM (iii) 100 fM (iv) 1 pM (v) 10 pM, and (vi) 100 pM in PB, pH 7.4.