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Ultrafast Interface Charge Separation in Carbon Nanodot-Nanotube Hybrids

Sciortino, A.; Ferrante, F.; Gonçalves, G.; Tobias, G.; Popescu, R.; Gerthsen, D.; Mauro, N.; Giammona, G.; Buscarino, G.; Gelardi, F. M.; Agnello, S.; Cannas, M.; Duca, D.; Messina, F.

Abstract:
Carbon dots are an emerging family of zero-dimensional nanocarbons behaving as tunable light harvesters and photoactivated charge donors. Coupling them to carbon nanotubes, which are well-known electron acceptors with excellent charge transport capabilities, is very promising for several applications. Here, we first devised a route to achieve the stable electrostatic binding of carbon dots to multi- or single-walled carbon nanotubes, as confirmed by several experimental observations. The photoluminescence of carbon dots is strongly quenched when they contact either semiconductive or conductive nanotubes, indicating a strong electronic coupling to both. Theoretical simulations predict a favorable energy level alignment within these complexes, suggesting a photoinduced electron transfer from dots to nanotubes, which is a process of high functional interest. Femtosecond transient absorption confirms indeed an ultrafast (<100 fs) electron transfer independent of nanotubes being conductive or semiconductive in nature, followed by a much slower back electron transfer (≈60 ps) from the nanotube to the carbon dots. The high degree of charge separation and delocalization achieved in these nanohybrids entails significant photocatalytic properties, as we demonstrate by the reduction of silver ions in solution. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000139773
Veröffentlicht am 12.11.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Laboratorium für Elektronenmikroskopie (LEM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1944-8244, 1944-8252
KITopen-ID: 1000139773
Erschienen in ACS Applied Materials and Interfaces
Verlag American Chemical Society (ACS)
Band 13
Heft 41
Seiten 49232–49241
Nachgewiesen in Scopus
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