Journal
ACS NANO
Volume 9, Issue 2, Pages 1683-1691Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn506473m
Keywords
photothermal effect; quantum confinement; electron-phonon interaction; ultrathin nanosheets; energy conversion
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Funding
- National Basic Research Program of China [2015CB932302]
- National Natural Science Foundation of China [21222101, U1432133, 11132009, 21331005, 11321503, J1030412]
- Chinese Academy of Science [XDB01010300]
- Fok Ying-Tong Education Foundation, China [141042]
- Fundamental Research Funds for the Central Universities [WK2060190027]
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We report a giant photothermal effect arising from quantum confinement in two-dimensional nanomaterials. ZrNCl ultrathin nanosheets with less than four monolayers of graphene-like nanomaterial successfully generated synergetic effects of larger relaxation energy of photon-generated electrons and intensified vibration of surface bonds, offering predominantly an enhancement of the electronphonon interaction to a maximized extent. As a result, they could generate heat flow reaching an ultrahigh value of 5.25 W/g under UV illumination with conversion efficiency up to 72%. We anticipate that enhanced electronphonon coupling in a quantum confinement system will be a powerful tool for optimizing photothermal conversion of inorganic semiconductors.
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