Poly(3-hexylthiophene) Nanoparticles Containing Thiophene-S,S-dioxide: Tuning of Dimensions, Optical and Redox Properties, and Charge Separation under Illumination

Francesca Di Maria*, Alberto Zanelli, Andrea Liscio, Alessandro Kovtun, Elisabetta Salatelli, Raffaello Mazzaro, Vittorio Morandi, Giacomo Bergamini, Avshalom Shaffer, Shlomo Rozen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

We describe the preparation of poly(3-hexylthiophene-S,S-dioxide) nanoparticles using Rozen's reagent, HOF·CH3CN, either on poly(3-hexylthiophene) (P3HT) or on preformed P3HT nanoparticles (P3HT-NPs). In the latter case, core-shell nanoparticles (P3HT@PTDO-NPs) are formed, as confirmed by X-ray photoelectron spectroscopy measurements, indicating the presence of oxygen on the outer shell. The different preparation modalities lead to a fine-tuning of the chemical-physical properties of the nanoparticles. We show that absorption and photoluminescence features, electrochemical properties, size, and stability of colloidal solutions can be finely modulated by controlling the amount of oxygen present. Atomic force microscopy measurements on the nanoparticles obtained by a nanoprecipitation method from preoxidized P3HT (PTDO-NPs) display spherical morphology and dimensions down to 5 nm. Finally, Kelvin probe measurements show that the coexistence of p- and n-type charge carriers in all types of oxygenated nanoparticles makes them capable of generating and separating charge under illumination. Furthermore, in core-shell nanoparticles, the nanosegregation of the two materials, in different regions of the nanoparticles, allows a more efficient charge separation.

Original languageEnglish
Pages (from-to)1991-1999
Number of pages9
JournalACS Nano
Volume11
Issue number2
DOIs
StatePublished - 28 Feb 2017

Funding

FundersFunder number
Horizon 2020 Framework Programme642196

    Keywords

    • Kelvin probe
    • Rozen's reagent
    • X-ray photoelectron spectroscopy
    • core-shell nanoparticles
    • heterojunction
    • organic nanoparticles
    • polythiophene-S,S-dioxide

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