TY - JOUR
T1 - MOF-derived nanoporous carbon/Co/Co3O4/CNTs/RGO composite with hierarchical structure as a high-efficiency electromagnetic wave absorber
AU - Wang, Yan
AU - Di, Xiaochuang
AU - Wu, Xinming
AU - Li, Xuanhua
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/12/15
Y1 - 2020/12/15
N2 - Lightweight and high-efficiency electromagnetic (EM) wave absorption are two key factors in the research of new-type absorbers, which could be obtained by regulating the component, structure, or suitable impedance matching. In this paper, a nanoporous carbon/Co/Co3O4/carbon nanotubes (CNTs)/reduced graphene oxide (RGO) composite with polyhedral structure was prepared by high-temperature pyrolysis of Co-based zeolitic imidazolate frameworks (ZIF 67). The carbon/Co/Co3O4/CNTs/RGO composite was composed of carbon polyhedrons, in which Co and Co3O4 particles were encapsulated by carbon polyhedrons and CNTs. With a filler ratio of 20 wt%, this absorber displayed the highest reflection loss (RL) of −59.2 dB at 11.2 GHz with 2.5 mm thickness and the absorption bandwidth (RL exceeding −10 dB) of 5.7 GHz (12.3–18 GHz) with a thickness of only 2 mm. The outstanding microwave absorption performance of this material results from proper impedance matching, synergistic effect, enhanced interfacial polarizations and interior cavities. This strategy may provide guidance for the manufacture of new-type absorbers with high-efficiency characteristics.
AB - Lightweight and high-efficiency electromagnetic (EM) wave absorption are two key factors in the research of new-type absorbers, which could be obtained by regulating the component, structure, or suitable impedance matching. In this paper, a nanoporous carbon/Co/Co3O4/carbon nanotubes (CNTs)/reduced graphene oxide (RGO) composite with polyhedral structure was prepared by high-temperature pyrolysis of Co-based zeolitic imidazolate frameworks (ZIF 67). The carbon/Co/Co3O4/CNTs/RGO composite was composed of carbon polyhedrons, in which Co and Co3O4 particles were encapsulated by carbon polyhedrons and CNTs. With a filler ratio of 20 wt%, this absorber displayed the highest reflection loss (RL) of −59.2 dB at 11.2 GHz with 2.5 mm thickness and the absorption bandwidth (RL exceeding −10 dB) of 5.7 GHz (12.3–18 GHz) with a thickness of only 2 mm. The outstanding microwave absorption performance of this material results from proper impedance matching, synergistic effect, enhanced interfacial polarizations and interior cavities. This strategy may provide guidance for the manufacture of new-type absorbers with high-efficiency characteristics.
KW - Graphene
KW - Hierarchical structure
KW - Metal-organic frameworks (MOFs)
KW - Microwave absorption
KW - Porous carbon
UR - http://www.scopus.com/inward/record.url?scp=85088792688&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2020.156215
DO - 10.1016/j.jallcom.2020.156215
M3 - 文章
AN - SCOPUS:85088792688
SN - 0925-8388
VL - 846
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 156215
ER -