Graphene-Based Adaptive Thermal Camouflage

Omer Salihoglu, Hasan Burkay Uzlu, Ozan Yakar, Shahnaz Aas, Osman Balci, Nurbek Kakenov, Sinan Balci, Selim Olcum, Sefik Suzer, Coskun Kocabas

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    Abstract

    In nature, adaptive coloration has been effectively utilized for concealment and signaling. Various biological mechanisms have evolved to tune the reflectivity for visible and ultraviolet light. These examples inspire many artificial systems for mimicking adaptive coloration to match the visual appearance to their surroundings. Thermal camouflage, however, has been an outstanding challenge which requires an ability to control the emitted thermal radiation from the surface. Here we report a new class of active thermal surfaces capable of efficient real-time electrical-control of thermal emission over the full infrared (IR) spectrum without changing the temperature of the surface. Our approach relies on electro-modulation of IR absorptivity and emissivity of multilayer graphene via reversible intercalation of nonvolatile ionic liquids. The demonstrated devices are light (30 g/m2), thin (<50 μm), and ultraflexible, which can conformably coat their environment. In addition, by combining active thermal surfaces with a feedback mechanism, we demonstrate realization of an adaptive thermal camouflage system which can reconfigure its thermal appearance and blend itself with the varying thermal background in a few seconds. Furthermore, we show that these devices can disguise hot objects as cold and cold ones as hot in a thermal imaging system. We anticipate that, the electrical control of thermal radiation would impact on a variety of new technologies ranging from adaptive IR optics to heat management for outer space applications.
    Original languageEnglish
    Pages (from-to)4541-4548
    Number of pages8
    JournalNano Letters
    Volume18
    Issue number7
    Early online date27 Jun 2018
    DOIs
    Publication statusPublished - 27 Jun 2018

    Keywords

    • Graphene optoelectronics
    • IR optics
    • electrolyte gating
    • heat management
    • multilayer graphene
    • reconfigurable surface
    • thermal camouflage
    • thermal emission
    • variable emissivity

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