Dual-Mode Stretchable Emitter with Programmable Emissivity and Air Permeability

Yinhyui Joo ¹, Dongkyun Kang ¹, Myeongkyu Lee ¹

⁰Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea.

Acs Applied Materials & Interfaces +

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November 5, 2024

View abstract on PubMed

Summary

Researchers developed a highly stretchable, air-permeable dual-mode emitter for advanced thermal management. This programmable material offers tunable emissivity and can display independent visible and thermal images, enhancing multispectral optical security applications.

Area Of Science

Materials Science
Nanotechnology
Optics

Background

Anisotropic emission materials are crucial for thermal management.
Existing dual-mode emitters in textiles, films, and photonic structures often lack multiple functionalities.
Versatile applications require emitters with enhanced properties like stretchability and programmability.

Purpose Of The Study

To present a highly stretchable, air-permeable dual-mode emitter with programmable emissivity.
To demonstrate the potential for creating independent visible and thermal images on a single device.
To provide a novel structure for advanced thermal management and multispectral optical security.

Main Methods

Fabrication of a dual-mode emitter using a germanium-antimony-tellurium (Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> or GST) cavity on a perforated elastomer substrate with an infrared-reflecting metal layer.
Utilizing laser-induced phase transition of GST from amorphous to crystalline states to alter emissivity.
Employing spatially modulated laser beams to program emissivity patterns for image generation.

Main Results

Achieved a large emissivity difference of 0.52 between the two sides of the emitter.
Demonstrated high stability and mechanical integrity, withstanding 50% strain during repeated stretching cycles.
Successfully programmed arbitrary emissivity patterns, enabling the printing of independent visible and thermal images.

Conclusions

The developed dual-mode emitter offers a unique combination of stretchability, air permeability, and programmable emissivity.
This technology shows significant promise for applications in thermal management, wearable devices, and multispectral optical security.
The ability to create programmable emissivity patterns opens new avenues for advanced imaging and anti-counterfeiting technologies.

Keywords:

emissivity control optical security phase-change material stretchable dual-mode emitter thermal management