Microwave absorption and dielectric behavior of lead sulfide – graphene composite nanostructure embedded polyvinylidinedilfuoride thin films. Issue 5 (4th July 2022)

• Record Type: Journal Article
• Authors: Dinakaran, Kannaiyan; Narayanasamy, Kavitha; Theerthagiri, Senthil; Peethambaram, Prabukanthan; Krishnan, Srinivasan; Roy, Debmalya
• Is Part Of: International journal of polymer analysis and characterization. Volume 27:Issue 5(2022)
• Page Start: 277
• Page End: 288
• Publication Date: 2022-07-04
• Subjects: Polyvinylidenedifluoride -- lead sulfide nanoparticles -- graphene -- hybrid nanostructures -- polymer nanocomposites -- thermal properties -- dielectric studies -- electromagnetic interference shielding studies -- microwave absorption; Polymers -- Analysis -- Periodicals; 547.705
• DOI: 10.1080/1023666X.2022.2067958
• Languages: English
• ISSNs: 1023-666X

Abstract

Abstract: A lightweight and flexible microwave absorbing composite of polyvinyledine difluoride (PVDF) was fabricated by loading PbS nanocubes embedded Graphene hybrid nanostructures into the PVDF matrix. The PbS embedded graphene nanosheets (PbS/GNs) are synthesized by hydrothermal technique. The PXRD pattern of the PbS, GNS and PbS/GNS suggested face-centered cubic structured PbS loaded GNS nanosheets. FE-SEM images of the graphene-bound lead sulfide octahedral nanocubes are found to have a size of 100 nm and are unvaryingly distributed on the surface of graphene nanosheets. HRTEM image of graphene surface image showing sheet-like structure is embedded with PbS nanocrystals. The PbS/GNs in PVDF matrix were found to exhibit enhanced dielectric constant, reduction in resistivity, and electrical conductivity. The high dielectric constant was exhibited by the 4% GNs dispersed PVDF with a value of 3.7x10 5 and 6% GNs/PbS dispersed PVDF showed 3.5 x10 5 at 1 MHz. The composite PbS/GNs into PVDF exhibit the maximum reflection loss dips in frequency band X for the PbS/Gra/PVDF samples. It is apparent that there are three absorption peaks in the region of 9–12 GHz in which the absorption of −6.9 dB is observed at 10 GHz.