title: Defect-Induced Near-Infrared Photoluminescence of Single-Walled Carbon Nanotubes Treated with Polyunsaturated Fatty Acids.
abstract: Single-walled carbon nanotubes (SWCNTs) have been incorporated in many emerging applications in the biomedical field including chemical sensing, biological imaging, drug delivery, and photothermal therapy. To overcome inherent hydrophobicity and improve their biocompatibility, pristine SWCNTs are often coated with surfactants, polymers, DNA, proteins, or lipids. In this paper, we report the effect of polyunsaturated fatty acids (PUFAs) on SWCNT photoluminescence. A decrease in the SWCNT bandgap emission (E11) and a new red-shifted emission (E11-) were observed in the presence of PUFAs. We attribute the change in SWCNT photoluminescence to the formation of oxygen-containing defects by lipid hydroperoxides through photo-oxidation. The observed changes in near-infrared emission of SWCNTs are important for understanding the interaction between SWCNTs and lipid biocorona. Our results also indicate that photoexcited SWCNTs can catalyze lipid peroxidation similarly to lipoxygenases.
authors.affiliation: Departments of †Chemistry, ‡Mechanical Engineering and Materials Science, §Environmental and Occupational Health, and ∥Bioengineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States.
authors.forename: Cheuk Fai
authors.initials: CF
authors.lastname: Chiu
authors.affiliation: Departments of †Chemistry, ‡Mechanical Engineering and Materials Science, §Environmental and Occupational Health, and ∥Bioengineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States.
authors.forename: Wissam A
authors.identifier: 0000-0001-6714-4832
authors.initials: WA
authors.lastname: Saidi
authors.affiliation: Departments of †Chemistry, ‡Mechanical Engineering and Materials Science, §Environmental and Occupational Health, and ∥Bioengineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States.
authors.forename: Valerian E
authors.identifier: 0000-0002-7245-1885
authors.initials: VE
authors.lastname: Kagan
authors.affiliation: Departments of †Chemistry, ‡Mechanical Engineering and Materials Science, §Environmental and Occupational Health, and ∥Bioengineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States.
authors.forename: Alexander
authors.identifier: 0000-0001-7863-5987
authors.initials: A
authors.lastname: Star
mesh_terms: D002384:Catalysis; D005231:Fatty Acids, Unsaturated / Q000737:chemistry*; D007259:Infrared Rays; D015227:Lipid Peroxidation; D008055:Lipids / Q000737:chemistry*; D049449:Luminescence; D015394:Molecular Structure; D037742:Nanotubes, Carbon / Q000737:chemistry*; D055668:Photochemical Processes
chemical_list: D005231:Fatty Acids, Unsaturated; D008055:Lipids; D037742:Nanotubes, Carbon