Abstract
Researchers have made a graphene-based thermal camouflage device that can adjust how much heat it emits in response to its surrounding temperature (Nano Lett. 2018, DOI: 10.1021/acs.nanolett.8b01746). The material could be used to hide people and planes from night-vision cameras, as well as help satellites survive extreme temperatures in space or lead to more responsive home heating systems. Above absolute zero, all materials radiate thermal energy, often in the form of infrared light. Night-vision goggles and other thermal cameras work by detecting this IR heat emission. Previous attempts to make a material whose IR emissions can be tuned on the fly have yielded rigid devices, materials that change their thermal colors too slowly, or devices that can only work in a narrow band of IR wavelengths. Coskun Kocabas, a materials scientist at the University of Manchester, knew that stacks of graphene interact with IR light, a property that’s dependent on
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