Vanadium dioxide nanopowders with tunable emissivity for adaptive infrared camouflage in both thermal atmospheric windows

Ji, Haining; Liu, Dongqing; Cheng, Haifeng; Zhang, Chaoyang; Yang, Lei

doi:10.1016/j.solmat.2017.10.013

Cited by 60 publications

(27 citation statements)

References 32 publications

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“…[6] Reducing the surface temperature and regulating the surface IR emissivity of an object are two main approaches to realize thermal camouflage. [7] Based on these strategies, various materials and systems, such as phase-change materials (PCMs), [2,8] thermal insulation materials, [9][10][11] metal film/coatings, [12][13][14] metasurfaces, [15][16][17][18][19] and several other methods, [20][21][22][23][24][25][26][27] have been developed to date. However, the following problems remain.…”

mentioning

confidence: 99%

Ultrathin Titanium Carbide (MXene) Films for High‐Temperature Thermal Camouflage

Shi

Liu

et al. 2021

Adv Funct Materials

132

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Thermal camouflage has attracted increasing attention owing to the rapid development of infrared (IR) surveillance technologies. Various materials and systems have been developed to date, but the realization of high-temperature thermal camouflage using ultrathin film/coating remains a great challenge; this is of great significance, especially for IR stealth in military equipment. This work demonstrates a series of ultrathin Ti 3 C 2 T x MXene films (as low as 1 µm) with superior high-temperature indoor/outdoor thermal camouflage performance: wide camouflage temperature range (from below −10 °C to over 500 °C), large reduction in radiation temperature (exceeding 300 °C for objects with temperatures over 500 °C), long-term high-temperature or fire stability, multifunctionality including disguised Joule heating capability, and high electromagnetic interference shielding efficiency. The superior high-temperature thermal camouflage performance of the ultrathin MXene film is attributed to its low mid-IR emissivity (0.19), which is comparable to that of stainless steel but far below that of other 2D nanomaterials, such as graphene. The multifunctional ultrathin MXene films prepared through simple vacuum-assisted filtration provide a feasible method for efficient high-temperature thermal camouflage using ultrathin films, demonstrating the great promise of MXene materials for thermal camouflage, IR stealth, counter-surveillance, and security protection.

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mentioning

confidence: 99%

Ultrathin Titanium Carbide (MXene) Films for High‐Temperature Thermal Camouflage

Shi

Liu

et al. 2021

Adv Funct Materials

132

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“…Using a similar synthetic approach that used V 2 O 5 and N 2 H 4 as precursors, a clear solution of VO 2+ was prepared in acidic solution, and further submitted to an hydrothermal treatment. [19] Such a treatment induced the decomposition of the molecular precursors. As illustrated in Figure 5, X-Ray diffraction (XRD) patterns evidenced crystal structure transformation with the formation of VO 2 (M) nanoparticles above 240°C with particle sizes ranging from 25 to 45 nm depending on the hydrothermal temperature applied.…”

Section: Direct Synthesis Of Vo2(m)/vo2(r) In Solutionmentioning

confidence: 99%

A Review of Vanadium Dioxide as an Actor of Nanothermochromism: Challenges and Perspectives for Polymer Nanocomposites

2018

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VO 2 has been intensively studied as a model system for Metal-Insulator Transition, ever since its phase switching behavior at relatively low temperature (T c =68°C) was discovered. Its thermo-active characteristics have been studied for applications in thermal solar collectors to prevent overheating of the fluid absorber, smart windows and smart tiles to optimize thermal comfort in buildings. In the last decades, strong efforts were made to develop protocols to process VO 2 -based material into thin films, coatings, porous layers and glazings in order to provide thermo-active properties to common substrates. A selection of complementary works in both the synthesis of VO 2 nanoparticles and formulation of VO 2 -polymer nanocomposites is proposed in the present review. The perspective of this work is to provide an easy entry to the thermochromic nanocomposite research field as a tutorial to tackle future challenges such as improving the application-oriented properties, in particular transition temperature T c and solar transmittance modulation ΔT sol . Synthesis techniques to fabricate VO 2 particles and nanoparticles and strategies to insert VO 2 particles in a polymer matrix are presented.

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“…Spectral diffuse reflectance in the mid-infrared (MIR) region is now of great interest in many applications such as thermal imagers, solar panels, and some optical techniques for military camouflage [ 1 , 2 , 3 , 4 ]. Thermal imagers measuring temperature require target emissivity as a calibration parameter, where the emissivity can be simply converted from the diffuse reflectance in the MIR region with the help of Kirchhoff’s law [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Reflectometers for Absolute and Relative Reflectance Measurements in the Mid-IR Region at Vacuum

Gene

Jeon

Lim

2021

Sensors

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We demonstrated spectral reflectometers for two types of reflectances, absolute and relative, of diffusely reflecting surfaces in directional-hemispherical geometry. Both are built based on the integrating sphere method with a Fourier-transform infrared spectrometer operating in a vacuum. The third Taylor method is dedicated to the reflectometer for absolute reflectance, by which absolute spectral diffuse reflectance scales of homemade reference plates are realized. With the reflectometer for relative reflectance, we achieved spectral diffuse reflectance scales of various samples including concrete, polystyrene, and salt plates by comparing against the reference standards. We conducted ray-tracing simulations to quantify systematic uncertainties and evaluated the overall standard uncertainty to be 2.18% (k = 1) and 2.99% (k = 1) for the absolute and relative reflectance measurements, respectively.

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Vanadium dioxide nanopowders with tunable emissivity for adaptive infrared camouflage in both thermal atmospheric windows

Cited by 60 publications

References 32 publications

Ultrathin Titanium Carbide (MXene) Films for High‐Temperature Thermal Camouflage

Ultrathin Titanium Carbide (MXene) Films for High‐Temperature Thermal Camouflage

A Review of Vanadium Dioxide as an Actor of Nanothermochromism: Challenges and Perspectives for Polymer Nanocomposites

Reflectometers for Absolute and Relative Reflectance Measurements in the Mid-IR Region at Vacuum

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