Reversible Charge Transfer with Single‐Walled Carbon Nanotubes Upon Harvesting the Low Energy Part of the Solar Spectrum. Issue 8 (31st January 2020)

• Record Type: Journal Article
• Authors: Menon, Arjun; Slominskii, Yuri L.; Joseph, Jan; Dimitriev, Oleg P.; Guldi, Dirk M.
• Is Part Of: Small. Volume 16:Issue 8(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-01-31
• Subjects: carbon nanotubes -- charge transfer interactions -- doping -- near‐infrared dyes -- noncovalent functionalization; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201906745
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Here, the ability of a novel near‐infrared dye to noncovalently self‐assemble onto the surface of single‐walled carbon nanotubes (SWCNTs) driven by charge‐transfer interactions is demonstrated. Steady‐state, Raman, and transient absorption spectroscopies corroborate the electron donating character of the near‐infrared dye when combined with SWCNTs, in the form of fluorescence quenching of the excited state of the dye, n‐doping of SWCNTs, and reversible charge transfer, respectively. Formation of the one‐electron oxidized dye as a result of interactions with SWCNTs is supported by spectroelectrochemical measurements. The ultrafast electronic process in the near‐infrared dye, once immobilized onto SWCNTs, starts with the formation of excited states, which decay to the ground state via the intermediate population of a fully charge‐separated state, with characteristic time constants for the charge separation of 1.5 ps and charge recombination of 25 ps, as derived from the multiwavelength global analysis. Of great relevance is the fact that charge‐transfer occurs from the hot excited state of the near‐infrared dye to SWCNTs. Abstract : The ultrafast electronic processes in the supramolecular nanosystem of near‐infrared dye immobilized onto single‐walled carbon nanotube, in the form of reversible charge transfer between the counterparts on the time scale of picoseconds, provides amazing sustainability of the system in the suspension form. The unusual excited‐state dynamics and the charge‐transfer process observed here opens up new opportunities toward supramolecular electronics with ultrafast switching.