离域电子
电荷(物理)
半导体
化学物理
材料科学
共轭体系
有机半导体
化学
纳米技术
光电子学
聚合物
有机化学
量子力学
物理
作者
Shuang Guo,Yeonju Park,Eungyeong Park,Sila Jin,Hua Zhong,Young Mee Jung
标识
DOI:10.1002/anie.202306709
摘要
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.
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