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Confining Tiny MoO 2 Clusters into Reduced Graphene Oxide for Highly Efficient Low Frequency Microwave Absorption
Author(s) -
Wu Cao,
Chen Zhaofeng,
Wang Meiling,
Cao Xun,
Zhang Yong,
Song Pin,
Zhang Tianyuan,
Ye Xinli,
Yang Yong,
Gu Weihua,
Zhou Jiadong,
Huang Yizhong
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202001686
Subject(s) - materials science , graphene , microwave , absorption (acoustics) , electromagnetic radiation , oxide , dielectric , reflection loss , attenuation , dielectric loss , pyrolysis , optoelectronics , nanotechnology , composite number , composite material , chemical engineering , optics , physics , engineering , quantum mechanics , metallurgy
Herein, a supermolecular‐scale cage‐confinement pyrolysis strategy is proposed to build two dielectric electromagnetic wave absorbents, in which MoO 2 nanoparticles are sandwiched uniformly between porous carbon shells and reduced graphene oxide (RGO). Both sandwich structures are derived from hybrid hydrogels doped by two different crosslinkers (with/without oxygen bridge), which can precisely confine Mo source (e.g., PMo 12 ). Without adding magnetic components, both absorbents exhibit excellent low frequency absorption performance in combination with electrically tunable ability and enhanced reflection loss value, which is superior over other relative 2D dielectric absorbers and satisfies the requirements of portable electronics. Notably, introducing oxygen bridges in the crosslinker generates a more stable confining configuration, which in turn renders its corresponding derivative exhibiting an extra multifrequency electromagnetic wave absorption trait. The intrinsic electromagnetic wave adjustment mechanism of the ternary hybrid absorbent is also explored. The result reveals that the elevated electromagnetic wave absorbing property is attributed to moderate attenuation constant and glorious impendence matching. The cage‐confinement pyrolysis route to fabricate 2D MoO 2 ‐based dielectric electromagnetic wave absorbents opens a new path for the design of electromagnetic wave absorbents used in multi/low frequency.