Abstract
Biomass-derived materials have recently received considerable attention as lightweight, low-cost, and green microwave absorbers. On the other hand, sulfide nanostructures due to their narrow band gaps have demonstrated significant microwave characteristics. In this research, carbon microtubes were fabricated using a biowaste and then functionalized by a novel complementary solvothermal and sonochemistry method. The functionalized carbon microtubes (FCMT) were ornamented by CuCo2S4 nanoparticles as a novel spinel sulfide microwave absorber. The prepared structures illustrated narrow energy band gap and deposition of the sulfide structures augmented the polarizability, desirable for dielectric loss and microwave attenuation. Eventually, the architected structures were blended by polyacrylonitrile (PAN) to estimate their microwave absorbing and antibacterial characteristics. The antibacterial properties against Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. aureus) were scrupulously assessed. Noteworthy, the maximum reflection loss (RL) of the CuCo2S4/PAN with a thickness of 1.75 mm was 61.88 dB at 11.60 GHz, while the architected FCMT/PAN composite gained a broadband efficient bandwidth as wide as 7.91 GHz (RL > 10 dB) and 3.25 GHz (RL > 20 dB) with a thickness of 2.00 mm. More significantly, FCMT/CuCo2S4/PAN demonstrated an efficient bandwidth of 2.04 GHz (RL > 20 dB) with only 1.75 mm in thickness. Interestingly, FCMT/CuCo2S4/PAN and CuCo2S4/PAN composites demonstrated an electromagnetic interference shielding efficiency of more than 90 and 97% at the entire x and ku-band frequencies, respectively.
Highlights
Biomass-derived materials have recently received considerable attention as lightweight, low-cost, and green microwave absorbers
Light-weight and low-cost electromagnetic wave absorbers with high performances based on biomass-derived reduced graphene oxides were reported by Cao et al The results suggest that biomass-rGO show a maximum reflection loss (RL) of 51.7 dB and an efficient bandwidth of 13.5 GHz (4.5–18 GHz) at a thickness of 3.25 mm, implying the unique critical role of the microstructure in adjusting the electromagnetic microwave absorption p erformance[55]
Mueller–Hinton agar was purchased from the IBRESCO E. coli ATCC 25922 and S. aureus ATCC 25923 obtained from Darvash Co. were employed to investigate the antibacterial characteristics
Summary
Biomass-derived materials have recently received considerable attention as lightweight, low-cost, and green microwave absorbers. Biomass-derived materials have emerged as light-weight, low-cost, and green microwave absorbers, which their fascinating microwave characteristics are originated from their dielectric and conductive p roperties[29,34]. It should be noted that the cobalt-based spinel oxides have exhibited salient microwave absorbing features the sulfide nanostructures have recently intrigued a great deal of interest due to their considerable relaxation loss features, generated by their narrow energy band gaps[45,46,47]. Light-weight and low-cost electromagnetic wave absorbers with high performances based on biomass-derived reduced graphene oxides (rGO) were reported by Cao et al The results suggest that biomass-rGO show a maximum RL of 51.7 dB and an efficient bandwidth of 13.5 GHz (4.5–18 GHz) at a thickness of 3.25 mm, implying the unique critical role of the microstructure in adjusting the electromagnetic microwave absorption p erformance[55]. It is noteworthy that the antibacterial characteristic of the nanocomposites as well as the used PAN as an absorbing medium, improving mechanical properties compared to the conventional wax, develop the practical applications of the tailored composites
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