2D Ti<sub>3</sub> C<sub>2</sub> T<sub>x</sub> MXenes: Visible Black but Infrared White Materials.
basic_science · Level V
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- Record sourced from PubMed, PMID 34463370.
- Also identified by DOI 10.1002/adma.202103054.
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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<sub>3</sub> C<sub>2</sub> T<sub>x</sub> 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<sub>2</sub> CT<sub>x</sub> , Nb<sub>2</sub> CT<sub>x</sub> , and V<sub>2</sub> CT<sub>x</sub> . This work opens the avenue to further exploration of a family of intrinsically low-emissivity materials with over 70 members.