AI Article Synopsis
- Black inorganic materials that reflect low infrared emission are rare but valuable for applications like energy harvesting and thermal insulation.
- Recent findings highlight the 2D Ti₃C₂Tₓ MXene, which shows a low mid-infrared emissivity of 10% and high solar absorptance of 90%, making it a standout option for these purposes.
- The study indicates that the infrared emissivity of MXenes can be adjusted based on their orientation and terminal groups, suggesting a wide range of potential low-emissivity materials for future research.
Article Abstract
Black inorganic materials with low infrared absorption/emission (or IR white) are rare in nature but highly desired in numerous areas, such as solar-thermal energy harvesting, multispectral camouflage, thermal insulation, and anti-counterfeiting. Due to the lack of spectral selectivity in intrinsic materials, such counter-intuitive properties are generally realized by constructing complicated subwavelength metamaterials with costly nanofabrication techniques. Here, the intrinsically low mid-IR emissivity (down to 10%) of the 2D Ti C T MXene is reported. Associated with a high solar absorptance (up to 90%), it embraces the best spectral selectivity among the reported intrinsic black solar-absorbing materials. Its appealing potential in several of the aforementioned areas is experimentally demonstrated. First-principles calculations reveal that the IR emissivity of MXene relies on both the nanoflake orientations and terminal groups, indicating great tunability. The calculations also suggest more potential low-emissivity MXenes including Ti CT , Nb CT , and V CT . This work opens the avenue to further exploration of a family of intrinsically low-emissivity materials with over 70 members.
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| http://dx.doi.org/10.1002/adma.202103054 | DOI Listing |
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