Precisely reducing the size of metal-organic frameworks(MOFs)derivatives is an effective strategy to manipulate their phase engineering owing to size-dependent oxidation;however,the underlying relationship between the size of derivatives and phase engineering has not been clarified so far.Herein,a spatial con-fined growth strategy is proposed to encapsulate small-size MOFs derivatives into hollow carbon nanocages.It realizes that the hollow cavity shows a significant spatial confinement effect on the size of confined MOFs crystals and subsequently affects the dielectric polarization due to the phase hybridization with tunable coherent interfaces and heterojunctions owing to size-dependent oxidation motion,yielding to satisfied microwave attenuation with an optimal reflection loss of-50.6 dB and effective band-width of 6.6 GHz.Meanwhile,the effect of phase hybridization on dielectric polariza-tion is deeply visualized,and the simulated calculation and electron holograms dem-onstrate that dielectric polarization is shown to be dominant dissipation mechanism in determining microwave absorption.This spatial confined growth strategy provides a versatile methodology for manipulating the size of MOFs derivatives and the understanding of size-dependent oxidation-induced phase hybridization offers a precise inspiration in optimizing dielectric polarization and microwave attenuation in theory.

Hanxiao Xu;Guozheng Zhang;Yi Wang;Mingqiang Ning;Bo Ouyang;Yang Zhao;Ying Huang;Panbo Liu

School of Chemistry and Chemical Engineering,μNorthwestern Poly technical University,Xi'an 710129,People's Republic of China;Key Laboratory of Magnetic Materials and Devices,Ningbo Institute of Materials Technology&Engineering,Chinese Academy of Sciences,Ningbo 315201,People's Republic of China;MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing,Nanjing University of Science and Technology,Nanjing 210094,People's Republic of China;Department of Mechanical and Materials Engineering,University of Western Ontario,London,ON N6A 5B9,Canada

纳微快报（英文）

[1]Hanxiao Xu;Guozheng Zhang;Yi Wang;Mingqiang Ning;Bo Ouyang;Yang Zhao;Ying Huang;Panbo Liu-.Size-Dependent Oxidation-Induced Phase Engineering for MOFs Derivatives Via Spatial Confinement Strategy Toward Enhanced Microwave Absorption)[J].纳微快报（英文）,2022(06):294-307

Confinement

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