Ultraviolet to Mid-Infrared Emissivity Control by Mechanically Reconfigurable Graphene.

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ID: 1576
2019
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Abstract
Spectral emissivity control is critical for optical and thermal management in the ambient environment because solar irradiance and atmospheric transmissions occur at distinct wavelength regions. For instance, selective emitters with low emissivity in the solar spectrum but high emissivity in the mid-infrared can lead to significant radiative cooling. Ambient variations require not only spectral control but also a mechanism to adjust the emissivity. However, most selective emitters are fixed to specific wavelength ranges and lack dynamic control mechanisms. Here we show ultraviolet to mid-infrared emissivity control by mechanically reconfiguring graphene, in which stretching and releasing induce dynamic topographic changes. We fabricate crumpled graphene with pitches ranging from 40 nm to 10 µm using deformable substrates. Our measurements and computations show that 140-nm-pitch crumpled graphene offers ultraviolet emissivity control in 200-300 nm wavelengths whereas 10-µm-pitch crumpled graphene offers mid-infrared emissivity control in 7-19 µm wavelengths. Significant emissivity changes arise from interference induced by the periodic topography and selective transmissivity reductions. Dynamic stretching and releasing of 140-nm- and 10-µm-pitch crumpled graphene show reversible emissivity peak changes at 250 nm and at 9.9 µm wavelengths, respectively. This work demonstrates the unique potential of crumpled graphene as a reconfigurable optical and thermal management platform.
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krishna2019ultraviolet Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Krishna, Anirudh;Kim, Jin Myung;Leem, Juyoung;Wang, Michael Cai;Nam, SungWoo;Lee, Jaeho;
Journal Nano letters
Year 2019
DOI
10.1021/acs.nanolett.9b01358
URL
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