Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 16, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202201323
Keywords
Charge Polarization; Chemical Etching; Shielding; Ti Vacancies; Wrinkled Titanium Carbide
Categories
Funding
- Fundamental Research Funds for the Provincial Universities of Zhejiang [GK209907299001-002, GK209907299001-013]
- Key Research and Development Plan of Zhejiang Province [2020C05014, 2020C01008, 2021C01193]
- National Key Scientific Instrument and Equipment Development Project of China [51927802]
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In this study, superior electromagnetic interference (EMI) shielding by absorbing electromagnetic waves (EWs) in MXenes with micro-sized wrinkles is achieved. The shielding effectiveness is enhanced by the asymmetrical distribution of charge densities near Ti vacancies, leading to resonant absorption of formed electric dipoles.
Despite the fact that the high conductivity of two-dimensional laminated transition metal carbides/nitrides (MXenes) contributes to the outstanding electromagnetic interference (EMI) shielding by the reflection of electromagnetic waves (EWs), it is difficulty to improve EMI shielding by pursuing higher conductivity due to the limitation of intrinsic properties. Here, we achieve superior EMI shielding by introducing the absorption of EWs in MXenes with micro-sized wrinkles which are induced by abundant Ti vacancies under chemical etching. The shielding effectiveness is up to 107 dB at a thickness of 20 mu m. Combining with atomic-scale structure observation and the first-principles calculations, it is concluded that the promotion of EMI shielding originates from the resonant absorption of formed electric dipoles induced by the asymmetrical distribution of charge densities near Ti vacancies. Our results could open a new vista for developing two-dimensional EMI shielding materials.
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