Excited-State Interaction of Semiconducting Single-Walled Carbon Nanotubes with Their Wrapping Polymers

The Journal of Physical Chemistry Letters
Simon KahmannMaria A Loi

Abstract

We employ photoluminescence and pump-probe spectroscopy on films of semiconducting single-walled carbon nanotubes (CNTs) of different chirality wrapped with either a wide band gap polyfluorene derivative (PF12) or a polythiophene with narrower gap (P3DDT) to elucidate the excited states' interplay between the two materials. Excitation above the polymer band gap gives way to an ultrafast electron transfer from both polymers toward the CNTs. By monitoring the hole polaron on the polymer via its mid infrared signature, we show that also illumination below the polymer band gap leads to the formation of this fingerprint and infer that holes are also transferred toward the polymer. As this contradicts the standard way of discussing the involved energy levels, we propose that polymer-wrapped CNTs should be considered as a single hybrid system, exhibiting states shared between the two components. This proposition is validated through quantum chemical calculations that show hybridization of the first excited states, especially for the thiophene-CNT sample.

References

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Citations

Jun 1, 2021·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Zhuoran KuangTiago Buckup
Jul 22, 2020·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Christopher P HoroszkoDaniel A Heller
May 8, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Peter NirmalrajMaria Antonietta Loi
Oct 22, 2021·ACS Applied Materials & Interfaces·Christopher P HoroszkoDaniel A Heller

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