Journal
ADVANCED MATERIALS
Volume 33, Issue 41, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202103054
Keywords
anti-counterfeiting; camouflage; infrared emissivity; MXenes; solar-thermal energy conversion; Ti; C-3; T-2; (x)
Categories
Funding
- Hong Kong Collaborative Research Fund [C6022-16G]
- HKUST-Kaisa joint research project [OKT20EG06]
- National Natural Science Foundation of China [52075484]
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This study reports the intrinsically low mid-IR emissivity of 2D Ti3C2Tx MXene and demonstrates its potential in various areas. First-principles calculations reveal that the IR emissivity of MXene relies on both the nanoflake orientations and terminal groups, indicating great tunability. Additionally, more potential low-emissivity MXenes including Ti2CTx, Nb2CTx, and V2CTx are suggested.
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 Ti3C2Tx 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 Ti2CTx, Nb2CTx, and V2CTx. This work opens the avenue to further exploration of a family of intrinsically low-emissivity materials with over 70 members.
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