Interfacial packing and optical organization in Langmuir–Schaefer fullerene/polythiophene blend films
Abstract
Langmuir–Schaefer (LS) films based on conjugated polymers and fullerene derivatives have attracted considerable interest due to the strong influence of molecular organization on their optical and electronic properties. In this work, LS films based on the fullerene derivative oligo[(phenyl‐C61‐butyric acid methyl ester)‐alt‐2,5‐bis(octyloxybenzene)] (OPCBMMB), the polythiophenes poly(3‐hexylthiophene‐2,5‐diyl) (P3HT) and poly(3‐octylthiophene‐2,5‐diyl) (P3OT) and their respective blend systems were investigated through surface pressure–area (π–A) isotherms and UV–visible absorption spectroscopy in order to evaluate the relationship between interfacial packing and optical organization. The π–A isotherms demonstrated that all systems are capable of forming organized Langmuir monolayers at the air–water interface, exhibiting liquid‐condensed behavior during compression. The blend monolayers showed shifts in the isotherms and changes in the mean molecular area in comparison to the pristine materials, indicating modifications in the intermolecular packing induced by the incorporation of the polythiophenes into the fullerene‐based systems. Differences between the P3HT‐ and P3OT‐based films suggest that the alkyl side‐chain length influences the molecular arrangement of the monolayers. The UV–visible absorption spectra revealed broadened absorption bands and redshifts in the LS films relative to the corresponding solutions, indicating intermolecular interactions and structural rearrangements during film formation. In the blend systems, the optical differences between P3HT and P3OT became less pronounced after the incorporation of OPCBMMB, suggesting that the fullerene derivative influences the packing and optical response of the polythiophenes within the mixed films. Overall, the combined analysis of the interfacial and optical results suggests that the molecular arrangement established during Langmuir monolayer compression may directly influence the optical organization of the transferred LS films.
Related
- Synthesis and Functional Properties of Fluorinated Phosphonate‐Substituted Porphyrins: Excellent Photosensitizers and Robust Precursors for Photoactive Langmuir–Schaefer Films
- Interfacial Molecular Behavior and Organization of Low-Fluorine Surfactants at the sc-CO2/Water Interface
- The Effect of a Fullerene Water Suspension on the Growth, Cell Viability, and Membrane Integrity of Escherichia coli B23
- Negative effects of oxygen and halogen species on charge extraction in perovskite solar cells with fullerene electron transport layers
- Pristine isolation of sixfold-symmetric oblate C72 fullerene validating the isolated pentagon rule and the spherical-saturation principle
BibTeX
@article{simois2026interfacial,
title = {{Interfacial packing and optical organization in Langmuir–Schaefer fullerene/polythiophene blend films}},
author = {André Vítor Santos Simõis and Maria Eduarda Rocha Santos Medina and Vinicius Jessé Rodrigues de Oliveira Patzer and Roger Hiorns and Clarissa de Almeida Olivati},
journal = {Polymer international},
year = {2026},
month = aug,
doi = {10.1002/pi.70184},
url = {https://hal.science/hal-05844736v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Interfacial packing and optical organization in Langmuir–Schaefer fullerene/polythiophene blend films
AU - André Vítor Santos Simõis
AU - Maria Eduarda Rocha Santos Medina
AU - Vinicius Jessé Rodrigues de Oliveira Patzer
AU - Roger Hiorns
AU - Clarissa de Almeida Olivati
PY - 2026
DA - 2026/08/03
JO - Polymer international
DO - 10.1002/pi.70184
UR - https://hal.science/hal-05844736v1
AB - Langmuir–Schaefer (LS) films based on conjugated polymers and fullerene derivatives have attracted considerable interest due to the strong influence of molecular organization on their optical and electronic properties. In this work, LS films based on the fullerene derivative oligo[(phenyl‐C61‐butyric acid methyl ester)‐alt‐2,5‐bis(octyloxybenzene)] (OPCBMMB), the polythiophenes poly(3‐hexylthiophene‐2,5‐diyl) (P3HT) and poly(3‐octylthiophene‐2,5‐diyl) (P3OT) and their respective blend systems were investigated through surface pressure–area (π–A) isotherms and UV–visible absorption spectroscopy in order to evaluate the relationship between interfacial packing and optical organization. The π–A isotherms demonstrated that all systems are capable of forming organized Langmuir monolayers at the air–water interface, exhibiting liquid‐condensed behavior during compression. The blend monolayers showed shifts in the isotherms and changes in the mean molecular area in comparison to the pristine materials, indicating modifications in the intermolecular packing induced by the incorporation of the polythiophenes into the fullerene‐based systems. Differences between the P3HT‐ and P3OT‐based films suggest that the alkyl side‐chain length influences the molecular arrangement of the monolayers. The UV–visible absorption spectra revealed broadened absorption bands and redshifts in the LS films relative to the corresponding solutions, indicating intermolecular interactions and structural rearrangements during film formation. In the blend systems, the optical differences between P3HT and P3OT became less pronounced after the incorporation of OPCBMMB, suggesting that the fullerene derivative influences the packing and optical response of the polythiophenes within the mixed films. Overall, the combined analysis of the interfacial and optical results suggests that the molecular arrangement established during Langmuir monolayer compression may directly influence the optical organization of the transferred LS films.
SN - 0959-8103
SN - 1097-0126
ER -