Low Infrared Emissivity and Strong Stealth of Ti-Based MXenes

Advanced scenario-adaptable infrared (IR) stealth materials are crucial for creating localized closed thermal environments. Low emissivity over the broadest possible band is expected, as is superior mechanical deformability. Herein, we report a series of Ti-based MXenes with naturally low emissivity as ideal IR shielding materials. Over a wavelength ranging from 2.5 to 25 mu m, Ti3C2Tx film delivers an average emissivity of 0.057 with the lowest point of 0.042. Such a low emissivity coupled with outstanding structural shaping capability is beyond the current grasp. The reflection-dominated mechanism is dissected. Also, some intriguing scenarios of IR stealth for wearable electronic devices and skin thermal control are demonstrated. This finding lights an encouraging path toward next-generation IR shielding by the expanding MXene family.

Automated summary

This study reports a series of Ti-based MXenes with naturally low emissivity, which are considered ideal infrared shielding materials. The Ti3C2Tx film has an average emissivity of 0.057 and a lowest point of 0.042 over a wavelength range from 2.5 to 25 μm. This finding offers a promising path for the development of next-generation infrared shielding materials.