CHARACTERIZATION AND GAS SENSING PROPERTIES OF GRAPHENE NANORIBBONS/INDIUM TRIOXIDE/POLYANILINE NANOCOMPOSITES

摘要

In this study, graphene nanoribbons (GNR) were prepared by longitudinal unzipping of multi-walled carbon nanotubes (MWCNTs). Graphene nanoribbons (GNR)-indium trioxide (In_2O_3) hybrid materials were prepared by a solvothermal reaction of an indium precursor containing GNR. Finally, the graphene nanoribbons/indium trioxide/polyaniline (GNR/In_2O_3/PANI) composite was prepared by in-situ polymerization method for ammonia detection. The synthesized hybrid nanocomposites were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Transmission electron microscopy (TEM). In ammonia gas sensing, the addition of mesoporous ln_2O_3 nanoparticles and GNR can significantly improve the sensing performance as compared to that of pure PANI. This result indicated that the GNR/In_2O_3/PANI sensor showed highest response value of 21.9 at 4 ppm NH_3 at room temperature, which was about 2.7 times higher than that of pure PANI. The enhancement of sensing performance for the GNR/In_2O_3/PANI nanocomposite was attributed to synergistic effect of p-n junction of PANI and mesoporous In_2O_3 nanoparticles with high surface ratio.