Thermodynamic Mechanism Governing the Coalescence of Conductive Particles in PEDOT:PSS under Laser Irradiation
- Authors
- Kim, Hongdeok; Won, Daeyeon; Ko, Seung Hwan; Choi, Joonmyung
- Issue Date
- Feb-2024
- Publisher
- American Chemical Society
- Citation
- Macromolecules, v.57, no.5, pp 1 - 9
- Pages
- 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- Macromolecules
- Volume
- 57
- Number
- 5
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/118188
- DOI
- 10.1021/acs.macromol.3c01870
- ISSN
- 0024-9297
1520-5835
- Abstract
- The strategy of obtaining selective electrical properties by laser irradiation of poly(3,4-ethylenedioxythiophene) stabilized with poly(4-styrenesulfonate) (PEDOT:PSS) is breaking new ground in the fabrication process of conductive films. In this study, the theoretical mechanism by which the laser irradiation induces coalescence of PEDOT-rich particles and improves electrical properties of PEDOT:PSS was explored from a thermodynamic perspective. The microstructural evolution by laser irradiation was experimentally verified, and the equivalent environment was implemented from coarse-grained molecular dynamics simulations. The results suggest that selective disruption between π-π interactions and electrostatic attraction, the forces governing the PEDOT-rich domain, is a key driving factor for enhanced phase separation in PEDOT:PSS. The energy supplied from the laser provides sufficient molecular mobility to allow the PEDOT-rich core to integrate with other adjacent cores without compromising the strong internal cohesion of its own core. The enhanced mobility leads to bridging-generating events with triggering of active molecular rearrangements between the cores, driving the coalescence of conductive particles. © 2024 American Chemical Society
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