1成果简介
日益加剧的电磁污染迫切需要高度灵活且易于制备的高性能电磁波吸收（EMA）材料。为此，本文，燕山大学Fusheng Wen、 Congpu Mu 等研究人员在《Carbon》期刊发表名为“Porous ANFs/GNs Composites Prepared by Direct Ink Writing 3D Printing for Superior Electromagnetic Wave Absorption”的论文，研究提出一种通过直接墨水书写（DIW）三维打印技术制备的多孔芳纶纳米纤维/石墨烯纳米片（ANFs/GNs）复合材料。
图1、(a) Schematic illustration of preparation process of ANFs/GNs composite materials. (b) XRD patterns, (c) Raman spectra, and (d) FTIR spectra of ANFs/GNs, ANFs, and GNs.
图2、Optical photos of 3D-printed ANFs/GNs composites with different stacking layers and grid spacings: (a) 4 layers with 6 mm grid spacing; (b) 10 layers with 5 mm grid spacing. (c-d) Bending test process for 4-layer composite, and (e-g) SEM images of ANFs/GNs with different magnifications.
图3. (a) Real parts and (b) imaginary parts of the complex relative permittivity, (c) real parts and (d) imaginary part of the complex relative permeability in the X-band (8.2–12.4 GHz). (e) dielectric loss tangent, (f) magnetic loss tangent, (g) Cole-Cole curves, and (h) attenuation constant of ANFs and ANFs/GNs composites. Reflection loss (RL) curves of (i) pure ANFs, (j) ANFs/GNs-2, (k) ANFs/GNs-4, and (l) ANFs/GNs-6 composites with various thickness as function of frequency.
图4. Electromagnetic parameters of ANFs/GNs composite materials with varying grid spacings. (a) Real parts and (b) imaginary parts of the complex relative permittivity, (c) real parts and (d) imaginary part of the complex relative permeability, (e) magnetic loss tangent, (f) dielectric loss tangent, (g) Cole-Cole curves of ANFs/GNs composite materials with grid spacings (L-2: 2 mm, L-3: 3 mm, L-4: 4 mm, L-5: 5 mm, L-6: 6 mm). Three-dimensional RL color maps of (h) L-2 (i) L-3 (j) L-4 (k) L-5 (l) L-6 composites with various thickness as function of frequency.
图5、(a) EAB and RLm?n of composites with different grid spacings as a function of thickness, (b-c) comparison of EMA performance between ANFs/GNs-4(L-3) and reported EMA materials, (d) schematic illustration of EMA mechanism of ANFs/GNs composites.
