Multilayer graphene-based radiation modulator for adaptive infrared camouflage with thermal management

Abstract

Graphene film is a promising thermal camouflage and thermal management material because of its thin, light, flexible structural characteristics and controllable broad-spectrum electromagnetic radiation modulation properties. In this study, a thermal radiation modulator based on multilayer graphene was studied by simulation and an equivalent transmission line model. The physical mechanism underlying the spectral characteristics and the sensitivity of infrared radiation modulation to the number of graphene layers is revealed. Furthermore, to solve the problem of thermal instability in the multilayer graphene-based thermal radiation modulator, a design scheme integrating a thermal radiation modulator and a meta-absorber is proposed. By electrical control of the multilayer graphene, the improved modulator can achieve dynamic emissivity modulation in the wavelength ranges of 3-5 µm and 8-14 µm for adaptive thermal camouflage while maintaining a high emissivity at 5-8 µm for radiative cooling. The compatibility of tunable infrared emission and radiative heat dissipation enables graphene to be used for thermal camouflage in complex environments and at high temperatures. The results not only promote the exploration of advanced thermal camouflage materials or devices but also provide inspiration for the application of graphene in thermal management, thermophotovoltaics, infrared displays and communications.

A Novel Transparent Memristor‐Type Infrared Emissivity Modulator for Multispectral Compatible Display

“…Figure 4f displays the IR radiation regulation performances of recently reported electrically tunable modulators. [8,9,11,[43][44][45][46][47][48][49] The performance of the proposed modulator is comparable to these recent reports, with additional benefits of large-scale fabrication due to its straightforward planar design, lightweight composition, and enhanced safety attributed to its all-solid structure. The high visible transparency of the proposed modulators offers opportunities to independently modulate visible and IR spectra, making the technology adaptable to a variety of application scenarios.…”

Memristive Thermal Radiator by Highly Tunable Graphene Plasmon

“…The GNRs are separated from a n-doped Si substrate by a few-nanometer-thick Al 2 O 3 layer. The choice of Graphene is because of its i) gate-tunable plasmon resonance at the mid-infrared range, [31][32][33] ii) transparent windows in the visible, [34] iii) high carrier mobility for fast switching, [33,35,36] iv) prominent thermal conductance [37][38][39][40][41][42] as well as its compatibility with various substrate through van der Waals contact. [42][43][44][45] The graphene plasmons can be directly thermally excited or generated by thermally excited phonons in the surrounding dielectrics, and decay into free space through thermal radiation.…”

Ultrathin Metal Film on Graphene for Percolation‐Threshold‐Limited Thermal Emissivity Control

“…[ 6,31 ] To overcome this challenge, a conformable thermal management layer can be fabricated by embedding a metamaterial onto a flexible film layer such as fabric, [ 32 ] polymer, [ 33 ] or polydimethylsiloxane [ 34 ] and subsequently transferring it onto the target surface. [ 35 ] Among various film matrixes, two‐dimensional graphene can be an ideal platform material. Graphene is flexible, [ 36 ] optically transparent, [ 37 ] transferrable, [ 38 ] chemically stable, [ 39 ] and, most importantly, can be a versatile template for the preparation of crystalline, [ 32 ] ultrathin materials.…”