Scalable 3D textile with hierarchically functionalized pyramidal units using nanostructured polyamide@carbon/Fe3O4 fibers for tunable microwave absorption

Nanometer-Sized Carbon Black and Fe3O4 Nanoparticles Incorporated into Polyamide-66 Composite Fibers and Woven into Three-Dimensional Fabrics for Electromagnetic Absorption

“…The molecular structures of those composite fibers were further analyzed by FTIR. As shown in Figure f, the absorption peaks of the pristine PA-66 fiber at 3298, 2938, and 2862 cm –1 are attributed to the N–H stretching, the methylene asymmetric stretching, and the methylene symmetric stretching vibration modes, respectively. , The peaks at 1637 and 1537 cm –1 are assigned to the characteristic absorption of amide I and II of the PA-66, respectively. , For the CB-Fe 3 O 4 /PA-66 composite fiber, the characteristic peaks at 1736 and 1401 cm –1 absorption are attributed to CB’s carbonyl stretching vibration and C–H in-plane bending vibration, respectively. , Besides, the infrared absorption peak at 575 cm –1 corresponds to the stretching vibration mode of the Fe–O bond of Fe 3 O 4 . , These results indicated that the carbon black and Fe 3 O 4 nanoparticles were successfully hybridized with PA-66, thus forming the CB-Fe 3 O 4 /PA-66 composite fiber.…”

“…25,26 The peaks at 1637 and 1537 cm −1 are assigned to the characteristic absorption of amide I and II of the PA-66, respectively. 27,28 For the CB-Fe 3 O 4 /PA-66 composite fiber, the characteristic peaks at 1736 and 1401 cm −1 absorption are attributed to CB's carbonyl stretching vibration and C−H in-plane bending vibration, respectively. 29,30 Besides, the infrared absorption peak at 575 cm −1 corresponds to the stretching vibration mode of the Fe−O bond of Fe 3 O 4 .…”