Large Femtosecond Two-Photon Absorption Cross-Sections of Fullerosome Vesicle Nanostructures Derived from Highly Photoresponsive Amphiphilic C(60)-Light-Harvesting Fluorene Dyad
| Autor: | Min Wang, Venkatesh Mamidala, Long Y. Chiang, Seaho Jeon, Thomas M. Cooper, Loon-Seng Tan, Venkatram Nalla, Wei Ji |
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| Rok vydání: | 2011 |
| Předmět: |
Nanostructure
Fullerene Molar concentration Chemistry Nanotechnology Fluorene Chromophore Photochemistry Two-photon absorption Article Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound General Energy Femtosecond Physical and Theoretical Chemistry Absorption (electromagnetic radiation) |
| Zdroj: | The journal of physical chemistry. C, Nanomaterials and interfaces. 115(38) |
| ISSN: | 1932-7447 |
| Popis: | We demonstrated ultrafast femtosecond nonlinear optical (NLO) absorption characteristics of bilayered fullerosome vesicle nanostructures derived from molecular self-assembly of amphiphilic oligo(ethylene glycolated) C(60)-(light-harvesting diphenylaminofluorene antenna). Fullerene conjugates were designed to enhance photoresponse in a femtosecond time scale by applying an isomerizable periconjugation linker between the C(60) cage and diphenylaminofluorene antenna subunit in an intramolecular contact distance of only3.0 Å. Morphology of C(60)(DPAF-EG(12)C(1))-based fullerosome nanovesicles in H(2)O was characterized to consist of a bilayered shell with a sphere diameter of 20-70 nm and a chromophore shell-width of 9.0-10 nm, fitting well with a head-to-head packing configuration of the molecular length. At the estimated effective nanovesicle concentration as low as 5.5 × 10(-8) MV (molecular molar concentration of 5.0 × 10(-4) M) in H(2)O, two-photon absorption (2PA) phenomena were found to be the dominating photophysical events showing a large molar concentration-insensitive 2PA cross-section value equivalent to 8500 GM in a form of nanovesicles, on average. The observed NLO characteristics led to a sharp trend of efficient light-transmittance intensity reduction at the input laser intensity above 100 GW/cm(2). |
| Databáze: | OpenAIRE |
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