Band Alignment Enabling Effective Charge Transfer for the Highly Enhanced Raman Scattering and Fluorescence of Metal-Nanoparticle-Decorated Conjugated Polymer Nanowires

Seung Hoon Lee, Ki Hong Park, Taegon Jeon, Gi Wan Jeon, Seokho Kim, Seung Woo Lee, Sangwook Wu, Dong Hyuk Park, Sung Chul Jung, Deuk Young Kim, Jae Won Jang

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The charge transfer (CT) process has attracted much attention due to its contribution to the improvement of spectroscopic phenomena such as Raman scattering and fluorescence. A current challenge is understanding what factors can influence CT. Here, it is demonstrated that the enhancement factor (EF) of CT (∼2000) can reach the level of electromagnetic enhancement (∼1680) when resonant CT is carried out by (Fermi level energy) band alignment between a metal nanoparticle (NP) and conjugated polymer (polypyrrole (PPy)) nanowire (NW). This band alignment results in an on- or off-resonant CT. As a proof of concept for CT based surface enhanced Raman scattering (SERS) template, the Ag NPs-decorated PPy NW is utilized to effectively enhance the Raman signal of rhodamine 6G (EF of 5.7 × 105). Hence, by means of our demonstration, it is proposed that controlling the band alignment should be considered an important parameter for obtaining a large EF of spectroscopic phenomena.

Original languageEnglish
Pages (from-to)750-762
Number of pages13
JournalJournal of Physical Chemistry Letters
Volume14
Issue number3
DOIs
StatePublished - 26 Jan 2023

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