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- Title
Molecular‐Orbital Delocalization Enhances Charge Transfer in π‐Conjugated Organic Semiconductors.
- Authors
Guo, Shuang; Park, Yeonju; Park, Eungyeong; Jin, Sila; Chen, Lei; Jung, Young Mee
- Abstract
π‐Conjugated organic semiconductors are promising materials for surface‐enhanced Raman scattering (SERS)‐active substrates based on the tunability of electronic structures and molecular orbitals. Herein, we investigate the effect of the temperature‐mediated resonance‐structure transitions of poly(3,4‐ethylenedioxythiophene) (PEDOT) in poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) (PEDOT : PSS) films on the interactions between substrate and probe molecules, thereby affecting the SERS activity. Absorption spectroscopy and density functional theory calculations show that this effect occurs mainly due to delocalization of the electron distribution in molecular orbitals, effectively promoting the charge transfer between the semiconductor and probe molecules. In this work, we investigate for the first time the effect of electron delocalization in molecular orbitals on SERS activity, which will provide new design ideas for the development of highly sensitive SERS substrates.
- Subjects
CHARGE transfer; MOLECULAR structure; MOLECULAR orbitals; ORGANIC semiconductors; POLYMER electrodes; SERS spectroscopy; DENSITY functional theory; ELECTRON delocalization
- Publication
Angewandte Chemie, 2023, Vol 135, Issue 34, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202306709