Optical Property Tuning of Single-Wall Carbon Nanotubes by Endohedral Encapsulation of a Wide Variety of Dielectric Molecules
| Autor: | Bea Botka, Jochen Campo, Sofie Cambré, Jeffrey A. Fagan, Wim Wenseleers, Jan Obrzut |
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| Rok vydání: | 2021 |
| Předmět: |
Nanotube
Materials science Population Stacking General Physics and Astronomy 02 engineering and technology Dielectric Carbon nanotube 010402 general chemistry Carbon nanotubes Chirality Electrical properties Encapsulation Molecules 01 natural sciences law.invention Condensed Matter::Materials Science symbols.namesake law Molecule General Materials Science education education.field_of_study Physics General Engineering 021001 nanoscience & nanotechnology 0104 chemical sciences Chemistry Nanopore Chemical physics symbols 0210 nano-technology Raman spectroscopy Engineering sciences. Technology |
| Zdroj: | ACS Nano ACS nano |
| ISSN: | 1936-086X 1936-0851 |
| Popis: | Specific and tunable modification to the opticalproperties of single-wall carbon nanotubes (SWCNTs) isdemonstrated through direct encapsulation into the nanotubeinterior of guest molecules with widely varying static dielectricconstants. Filled through simpleingestion of the guestmolecule, each SWCNT population is demonstrated to displaya robust modification to absorbance, fluorescence, and Ramanspectra. Over 30 distinct compounds, covering static dielectricconstants from 1.8 to 109, are inserted in large diameterSWCNTs (d = 1.104−1.524 nm) and more than 10 compoundsin small diameter SWCNTs (d = 0.747−1.153 nm), demonstratingthat the general effect of filler dielectric on thenanotube optical properties is a monotonic energy reduction(red-shifting) of the optical transitions with increased magnitude of the dielectric constant. Systematic fitting of the twodimensionalfluorescence−excitation and Raman spectra additionally enables determination of the critical filling diameter foreach molecule and distinguishing of overall trends from specific guest−host interactions. Comparisons to predictions fromexisting theory are presented, and specific guest molecule/SWCNT chirality combinations that disobey the general trend andtheory are identified. A general increase of the fluorescence intensity and line narrowing is observed for low dielectricconstants, with long linear alkane filled SWCNTs exhibiting emission intensities approaching those of empty SWCNTs. Theseresults demonstrate an exploitable modulation in the optical properties of SWCNTs and provide a foundation for examininghigher-order effects, such as due to nonbulk-like molecule stacking, in host−guest interactions in well-controlled nanoporesize materials. |
| Databáze: | OpenAIRE |
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