Tuning the Defects in AgO Nanoparticles/Graphene Bilayers System by Laser Power Density

Abstract

Abstract:The silver oxide nanoparticles (AgONps) used in this study was obtained by laser ablation technique. On the other hand, graphene bilayers were obtained through micro mechanic exfoliation. Both techniques are considered clean, simple and they have economic viability. The analyses have showed a positive charge in nanoparticles and alteration in Raman spectra caused by doping in the bilayer observing the appearing of D band. The alterations in the Raman spectrums are related with the introduced defects in the crystalline chain after the nanoparticles incorporation on bilayers. However, we have been doing a systematic study about the Raman laser output in only graphene bilayer and in graphene bilayer doped with nanoparticles. These measurements have shown a clear difference to both cases. The distance between defects has been showing to be inversely proportional to the ratio I D /I G in the analyzed cases, increasing (up power) or lowering (down power) the incident laser output, with this it was possible to handle the defect distances in the case of AgO nanoparticles/graphene bilayers. Finally, we analyzed the ratio of the integrated area of D and G band, from these parameters are determined the defect density (N D ) and the defects density (L D ). Thus, we clearly find a tuning between the N D and L D as a function of laser power density Raman using to  = 532 nm.