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Journal of Nanomaterials
Volume 2017, Article ID 2757590, 8 pages
https://doi.org/10.1155/2017/2757590
Research Article

CVD-Graphene-Based Flexible, Thermoelectrochromic Sensor

1Military Institute of Engineer Technology, Obornicka 136 Str., 50-961 Wroclaw, Poland
2Institute of Electronic Materials Technology, Wolczynska 133 Str., 01-919 Warsaw, Poland

Correspondence should be addressed to Adam Januszko; lp.corw.itiw@okzsunaj

Received 29 March 2017; Accepted 21 June 2017; Published 27 July 2017

Academic Editor: Stefano Bellucci

Copyright © 2017 Adam Januszko et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The main idea behind this work was demonstrated in a form of a new thermoelectrochromic sensor on a flexible substrate using graphene as an electrically reconfigurable thermal medium (TEChrom™). Our approach relies on electromodulation of thermal properties of graphene on poly(ethylene terephthalate) (PET) via mechanical destruction of a graphene layer. Graphene applied in this work was obtained by chemical vapor deposition (CVD) technique on copper substrate and characterized by Raman and scanning tunneling spectroscopy. Electrical parameters of graphene were evaluated by the van der Pauw method on the transferred graphene layers onto SiO2 substrates by electrochemical delamination method. Two configurations of architecture of sensors, without and with the thermochromic layer, were investigated, taking into account the increase of voltage from 0 to 50 V and were observed by thermographic camera to define heat energy. Current-voltage characteristics obtained for the sensor with damaged graphene layer are linear, and the resistivity is independent from the current applied. The device investigated under 1000 W/m2 exhibited rise of resistivity along with increased temperature. Flexible thermoelectrochromic device with graphene presented here can be widely used as a sensor for both the military and civil monitoring.