An Electrical Switch‐Driven Flexible Electromagnetic Absorber. (11th November 2019)

• Record Type: Journal Article
• Authors: Lv, Hualiang; Yang, Zhihong; Xu, Hongbin; Wang, Liuying; Wu, Renbing
• Is Part Of: Advanced functional materials. Volume 30:Number 4(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-11-11
• Subjects: fine‐tune components -- flexible electric‐driven devices -- linear‐regulation of permittivity -- selective EM absorption -- switchable; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201907251
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: The development of a thin, tunable, and high‐performance flexible electromagnetic (EM) absorbing device that aims to solve signal interference or EM pollution is highly desirable but remains a great challenge. Herein, demonstrated is a flexible electrical‐driven device constructed by an insulated organic‐polymer substrate, carrier transmission layer, and core–shell structured absorber, enabling a narrow and tunable effective absorption region ( f E < 2.0 GHz) by controlling the external voltage toward this challenge. As a key design element, the selected absorber consists of an Sn/SnS/SnO2 core and C shell, which exhibits an exceptional dielectric‐response ability at a small voltage, which is attributed to desirable carrier mobility and excitable carriers. Multiple f E ‐tuning regions (maximum up to 7.0), covering 90% of C‐band can be achieved for Sn/SnS/SnO2 @C‐based flexible device by selecting a low voltage (2–12 V). The strategy developed here may open a new avenue toward the design of flexible intelligent EM device for practical applications. Abstract : A flexible, thin electrical‐driven electromagnetic absorption device is innovatively designed by constructing an insulated organic‐polymer substrate, carrier transmission layer and core–shell structured absorber. The as‐designed device exhibits an exceptional electrical switching capability at low‐frequency regions and is like a "sieve, " enabling the selective absorbtion of specific electromagnetic waves especially in the C‐ or S‐band.