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Diameter-dependent single- and double-file stacking of squaraine dye molecules inside chirality-sorted single-wall carbon nanotubes

Forel, Salomé; Li, Han 1; van Bezouw, Stein; Campo, Jochen; Wieland, Laura 1; Wenseleers, Wim ; Flavel, Benjamin S. 1; Cambré, Sofie
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)


The filling of single-wall carbon nanotubes (SWCNTs) with dye molecules has become a novel path to add new functionalities through the mutual interaction of confined dyes and host SWCNTs. In particular cases, the encapsulated dye molecules form strongly interacting molecular arrays and these result in severely altered optical properties of the dye molecules. Here, we present the encapsulation of a squaraine dye inside semiconducting chirality-sorted SWCNTs with diameters ranging from ∼1.15 nm, in which the dye molecules can only be encapsulated in a single-file molecular arrangement, up to ∼1.5 nm, in which two or three molecular files can fit side-by-side. Through the chirality-selective observation of energy transfer from the dye molecules to the surrounding SWCNTs, we find that the absorption wavelength of the dye follows a peculiar SWCNT diameter dependence, originating from the specific stacking of the dye inside the host SWCNTs. Corroborated by a theoretical model, we find that for each SWCNT diameter, the dye molecules adopt a close packing geometry, resulting in tunable optical properties of the hybrid when selecting a specific SWCNT chirality.

Verlagsausgabe §
DOI: 10.5445/IR/1000148823
DOI: 10.1039/d2nr01630c
Zitationen: 1
Web of Science
Zitationen: 1
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 16.06.2022
Sprache Englisch
Identifikator ISSN: 2040-3364, 2040-3372
KITopen-ID: 1000148823
HGF-Programm 43.31.02 (POF IV, LK 01) Devices and Applications
Erschienen in Nanoscale
Verlag Royal Society of Chemistry (RSC)
Band 14
Heft 23
Seiten 8385–8397
Nachgewiesen in Web of Science
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