Facile hydrothermal method for synthesizing nitrogen-doped graphene nanoplatelets using aqueous ammonia: dispersion, stability in solvents and thermophysical performances

摘要: A simple and green approach has been developed to synthesize nitrogen-doped graphene nanoplatelets (N-doped GNPs) for mass production with a very high stability in different solvents e.g. water, ethylene glycol, methanol, ethanol, 1-hexanol. The strategy is based on mild oxidation of GNPs using hydrogen peroxide doping nitrogen hydrothermal process. modification N-doped was demonstrated by FTIR, TGA, XPS, Raman spectroscopy resolution-transmission electron microscope (HRTEM). Further study carried out as an additive prepare colloidal dispersions. Water-based GNPs, methanol-based ethanol-based ethylene-glycol 1-hexanol-based dispersions at 0.01 wt.% shown great stabilities, indicating 17%, 29%, 33%, 18%, 43% sedimentations after 15-days period, respectively. thermophysical properties e.g., viscosity thermal conductivity water-based GNP nanofluids were also evaluated weight concentrations 0.100, 0.075, 0.050, 0.025 wt.%. Through this, it found that the obtained have potential be used working fluids industrial systems.