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Metal-Loaded Synthetic Melanin via Oxidative Polymerization of Neurotransmitter Norepinephrine Exhibiting High Photothermal Conversion.
- Source :
-
Nano letters [Nano Lett] 2024 May 29; Vol. 24 (21), pp. 6353-6361. Date of Electronic Publication: 2024 May 17. - Publication Year :
- 2024
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Abstract
- Polydopamine (PDA)-derived melanin-like materials exhibit significant photothermal conversion owing to their broad-spectrum light absorption. However, their low near-infrared (NIR) absorption and inadequate hydrophilicity compromise their utilization of solar energy. Herein, we developed metal-loaded poly(norepinephrine) nanoparticles (PNE NPs) by predoping metal ions (Fe <superscript>3+</superscript> , Mn <superscript>3+</superscript> , Co <superscript>2+</superscript> , Ca <superscript>2+</superscript> , Ga <superscript>3+</superscript> , and Mg <superscript>2+</superscript> ) with norepinephrine, a neuron-derived biomimetic molecule, to address the limitations of PDA. The chelation between catechol and metal ions induces a ligand-to-metal charge transfer (LMCT) through the formation of donor-acceptor pairs, modulating the light absorption behavior and reducing the band gap. Under 1 sun illumination, the Fe-loaded PNE coated wood evaporator achieved a high seawater evaporation rate and efficiency of 1.75 kg m <superscript>-2</superscript> h <superscript>-1</superscript> and 92.4%, respectively, owing to the superior hydrophilicity and photothermal performance of PNE. Therefore, this study offers a comprehensive exploration of the role of metal ions in enhancing the photothermal properties of synthetic melanins.
Details
- Language :
- English
- ISSN :
- 1530-6992
- Volume :
- 24
- Issue :
- 21
- Database :
- MEDLINE
- Journal :
- Nano letters
- Publication Type :
- Academic Journal
- Accession number :
- 38757814
- Full Text :
- https://doi.org/10.1021/acs.nanolett.4c01246