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Tuning the nature of nitrogen atoms in N-containing reduced graphene oxide

AutorSandoval, Stefania ; Kumar, Nitesh; Oró, Judith ; Sundaresan, Athinarayanan; Rao, Chitamani N. R.; Fuertes, Amparo ; Tobias, Gerard
Palabras claveWalled carbon nanotubes
Doped graphene
Oxygen reduction
Graphite oxides
Functionalization
Layer
Electrocatalyst
Supercapacitors
Deposition
Microwave
Fecha de publicaciónene-2016
EditorElsevier
CitaciónCarbon 96: 594-602 (2016)
ResumenPhysical and chemical properties of graphene can be tailored by nitrogen doping. As a consequence of the continuous race to achieve the highest possible amount of doping there is a growing tendency to assume that all N species are incorporated within the graphene lattice (doping). Here we show that this is not always the case and employ several complementary techniques that allow a proper assessment of the type of nitrogen present. The nature of the nitrogen atoms has been tuned by ammonolysis of graphene oxide in the range of 100 °C–800 °C. This allows us to expand the capabilities of the synthetic approach to afford not only N-doping (at high temperature) but also to introduce amine and amide moieties at 100 °C; the latter presenting a much higher dispersability in aqueous media than graphene oxide. Interestingly, the sample with the highest amount of nitrogen (14.7 wt. %) cannot be referred to as N-doped graphene since it also contains N-bearing aliphatic moieties.
Versión del editorhttp://dx.doi.org/10.1016/j.carbon.2015.09.085
URIhttp://hdl.handle.net/10261/148502
DOI10.1016/j.carbon.2015.09.085
10.1016/j.carbon.2015.09.085
ISSN0008-6223
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