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Layered Aluminum for Electromagnetic Wave Absorber with Near-Zero Reflection

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Title
Layered Aluminum for Electromagnetic Wave Absorber with Near-Zero Reflection
Author(s)
Taehoon Kim; Hyung Wan Do; Kyu-Jong Choi; Sungsoon Kim; Minwoo Lee; Taeyoung Kim; Byung-Kyu Yu; Jinwoo Cheon; Byung-wook Min; Wooyoung Shim
Publication Date
2021-01
Journal
NANO LETTERS, v.21, no.2, pp.1132 - 1140
Publisher
AMER CHEMICAL SOC
Abstract
Ideal electromagnetic (EM) wave absorbers can absorb all incident EM waves, regardless of the incident direction, polarization, and frequency. Absorptance and reflectance are intrinsic material properties strongly correlated with electrical conductivity; hence, achieving perfect absorptance with zero reflectance is challenging. Herein, we present a design strategy for preparing a nearly ideal EM absorber based on a layered metal that maximizes absorption by utilizing multiple internal reflections and minimizes reflection using a monotonic gradient of intrinsic impedance. This approach was experimentally verified using aluminum nanoflakes prepared via topochemical etching of lithium from Li9Al4, and the impedance-graded structure was obtained through the size-based sorting behavior of aluminum nanoflakes sinking in dispersion. Unlike in traditional shielding materials, strong absorption (26.76 dB) and negligible reflectivity (0.04 dB) with a ratio of >10(3) can be achieved in a 120 mu m thick film. Overall, our findings exhibit potential for developing a novel class of antireflective shielding materials.
URI
https://pr.ibs.re.kr/handle/8788114/9456
DOI
10.1021/acs.nanolett.0c04593
ISSN
1530-6984
Appears in Collections:
Center for Nanomedicine (나노의학 연구단) > 1. Journal Papers (저널논문)
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