Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, 1983969411, Iran.
Department of Chemical Engineering, Energy Institute of Higher Education, Saveh, Iran.
Sci Rep. 2021 Jun 7;11(1):11932. doi: 10.1038/s41598-021-91370-5.
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 CuCoS 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 CuCoS/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/CuCoS/PAN demonstrated an efficient bandwidth of 2.04 GHz (RL > 20 dB) with only 1.75 mm in thickness. Interestingly, FCMT/CuCoS/PAN and CuCoS/PAN composites demonstrated an electromagnetic interference shielding efficiency of more than 90 and 97% at the entire x and ku-band frequencies, respectively.
生物衍生材料作为轻质、低成本和绿色的微波吸收剂，最近受到了广泛关注。另一方面，由于其窄带隙，硫化物纳米结构表现出显著的微波特性。在这项研究中，使用生物废料制造了碳微管，然后通过新颖的互补溶剂热和超声化学方法进行功能化。功能化的碳微管（FCMT）被 CuCoS 纳米颗粒装饰，作为一种新型尖晶石硫化物微波吸收剂。所制备的结构表现出窄能带隙，并且硫化物结构的沉积增加了极化率，有利于介电损耗和微波衰减。最终，将所设计的结构与聚丙烯腈（PAN）混合，以评估其微波吸收和抗菌特性。对革兰氏阴性大肠杆菌（E. coli）和革兰氏阳性金黄色葡萄球菌（S. aureus）的抗菌性能进行了严格评估。值得注意的是，厚度为 1.75 mm 的 CuCoS/PAN 的最大反射损耗（RL）在 11.60 GHz 时为 61.88 dB，而所设计的 FCMT/PAN 复合材料在 2.00 mm 厚度下获得了宽带高效带宽，宽达 7.91 GHz（RL>10 dB）和 3.25 GHz（RL>20 dB）。更重要的是，FCMT/CuCoS/PAN 在 1.75 mm 厚度下表现出 2.04 GHz 的有效带宽（RL>20 dB）。有趣的是，FCMT/CuCoS/PAN 和 CuCoS/PAN 复合材料在整个 x 和 ku 波段频率下的电磁干扰屏蔽效率均超过 90%和 97%。
