Title data
Pantawane, Sanwardhini ; Müller, Sebastian Johannes ; Gekle, Stephan:
Effect of particle insertion on Poly(3-hexylthiophene) brush’s π-π stacking.
In: Computational Materials Science.
Vol. 226
(2023)
.
- 112253.
ISSN 1879-0801
DOI: https://doi.org/10.1016/j.commatsci.2023.112253
Abstract in another language
A key mechanism in organic thin film transistor based biosensors is the change in charge carrier mobility caused by the disruption of π-π bonds in the selfassembled monolayers of conjugated polymers due to the attachment of the target analyst. We study the particle induced conformational changes of a π-π stacked Poly(3-hexylthiophene) (P3HT) brush using Molecular Dynamics simulations to mimic this event. The polymer brush is modeled using a Martini coarse-grained forcefield and Lennard-Jones particles of different sizes (0.5 nm < Rp < 3 nm) are inserted up to different heights in the brush. We quantify the disruption of the initially perfectly aligned π-π stack network using three properties: (i) the spatial P3HT monomer density profile, (ii) the spatial distribution of π-π bound monomer pairs, and (iii) the connectivity of the disrupted network. The perturbation of the brush leads to a short-ranged depletion of monomers at the particle position and the subsequent rearrangement of the entire π-π stack network. Interestingly, we find that the ratio of π-π -bound monomer pairs compared to unbound pairs increases in the neighborhood of the particle. We attribute this observation to crowding effects occurring in the brush when the particle penetrates. In general, we find stronger effects for deeper penetration.
Further data
Item Type: | Article in a journal |
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Refereed: | Yes |
Institutions of the University: | Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Theoretical Physics VI - Simulation and Modelling of Biofluids Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Theoretical Physics VI - Simulation and Modelling of Biofluids > Professor Theoretical Physics VI - Simulation and Modelling of Biofluids - Univ.-Prof. Dr. Stephan Gekle Profile Fields Profile Fields > Advanced Fields Profile Fields > Advanced Fields > Nonlinear Dynamics |
Result of work at the UBT: | Yes |
DDC Subjects: | 500 Science 500 Science > 530 Physics |
Date Deposited: | 23 May 2023 06:20 |
Last Modified: | 23 May 2023 06:20 |
URI: | https://eref.uni-bayreuth.de/id/eprint/76508 |