Generation of Defective Few-Layered Graphene Mesostructures by High-Energy Ball Milling and Their Combination with FeSiCuNbB Microwires for Reinforcing Microwave Absorbing Properties

• DOI: 10.1021/acsami.2c19886
• Publication Date: 2023-01-06T11:14:53Z
• Authors: Jesús López-Sánchez; Álvaro Peña; Aída Serrano; Adolfo del Campo; Óscar Rodríguez d...; Noemí Carmona; Daniel Matatagui; María del Carmen ...; Juan Rubio-Zuazo; Elena Navarro; Pilar Marín
• Keywords: Reflection loss; Dielectric loss; Reflection coefficient

Defective few-layered graphene mesostructures (DFLGMs) are produced from graphite flakes by high-energy milling processes. We obtain an accurate control of the generated mesostructures, as well amount and classification structural defects formed, providing a functional material for microwave absorption purposes. Working under far-field conditions, competitive values minimum reflection loss coefficient (RLmin) = -21.76 dB EAB 4.77 achieved when DFLGMs immersed in paints at low volume fraction (1.95%). One step forward is developed combining them with excellent behavior that offers amorphous Fe73.5Si13.5B9Cu1Nb microwires (MWs), varying their filling contents, which below 3%. RLmin improvement 47% (-53.08 dB) enhancement 137% (4 compared to those obtained MW-based paints. Furthermore, fmin tunability demonstrated, maintaining similar values, irrespective ideal matching thickness. In this scenario, Maxwell-Garnet standard model valid, dielectric losses mainly come multiple reflections, interfacial polarizations, greatly boost attenuation MWs. The present concept can remarkably enhance not only MW but also apply other architectures technological interest adding quantities DFLGMs.