Synthesis, characterization, and microwave absorbing of PbS/GQDs

Document Type : Original Article


1 Young Researchers and Elite Club, Marand Branch, Islamic Azad University, Marand, Iran

2 Faculty of Petroleum and Chemical Engineering, Islamic Azad University Science and Research Branch, Tehran, Iran


To prevent serious electromagnetic interference, a single-layer wave-absorbing coating employing lead sulfide/sulfur and nitrogen co-doped graphene quantum dots (PbS/S,N-GQDs) with epoxy resin as matrix was prepared. For this purpose, PbS/S,N-GQDs nanocomposites were prepared via simple and novel procedure. The prepared products was characterized through X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy (FTIR) analysis. Results showed that S,N-GQDs have been distributed on the flower-like morphology of PbS in PbS/S,N-GQDs nanocomposites. The electromagnetic parameters of products were measured in the frequency range of 8–12 GHz by transmission/reflection technology, and the electromagnetic loss mechanisms of the two particles were discussed, respectively. The microwave absorption properties of the coatings were investigated by measuring reflection loss (RL) using arch method. It was found that the 10% of PbS/S,N-GQDs and 5 mm thickness are the optimum condition for high RL efficiency. At this condition, maximum absorption and average absorption was measured -16.3 and -4.05 dB respectively.