Abstract
In this study, the sensitivity of reduced graphene oxide structures (rGO) to the action of selected gases (especially hydrogen, but also nitrogen dioxide and ammonia) was examined. Two sensing structures, based on rGO structures, obtained by different methods of oxidation (the modified Hummers, and the modified Tour’s method respectively), were investigated. We show here that the method used for the oxidation of rGO influences the sensitivity of the sensing structure during contact with various gaseous atmospheres. We performed our experiments in the atmosphere, containing hydrogen in a concentration range from 0 to 4% in nitrogen or synthetic air, both in dry and wet conditions. The temperature range was from 50 °C to 190 °C. Finally, we checked how the resistance of the samples changes when the other gases (NO2, NH3) appear in tested gas mixtures. The gas investigations were supplemented by the characterization of rGOs materials using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and N2 sorption method.
Highlights
The family of carbon materials, includes graphite (3D), graphene (2D), carbon nanotubes (1D) and fullerenes (0D) [1,2]
We present the results of the measurements performed using the structures differing only in receptor layers (TRGO1/TRGO2)
Our results shows that both tested TRGO structures have limited sensitivity to the tested gases
Summary
The family of carbon materials, includes graphite (3D), graphene (2D), carbon nanotubes (1D) and fullerenes (0D) [1,2]. The graphene attracted a great interest of researchers [3]. This material is characterized by a good mechanical properties [3,4], excellent electrical conductivity [3] and thermal properties [4,5]. Exemplary production methods are: Micromechanical cleavage, epitaxial growth or chemical vapour deposition methods [3]. This material is unique, but it is worth paying attention to.
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