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

doi:10.1021/acs.jpclett.2c03602

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

Geochemistry & Interfacial Science

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6 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 language	English
Pages (from-to)	750-762
Number of pages	13
Journal	Journal of Physical Chemistry Letters
Volume	14
Issue number	3
DOIs	https://doi.org/10.1021/acs.jpclett.2c03602
State	Published - Jan 26 2023

Funding

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2016R1A6A1A03012877; 2021R1A4A5031805; 2022R1H1A2091399). Also, this work was supported by the Dongguk University Research Fund of 2020.

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10.1021/acs.jpclett.2c03602

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Lee, S. H., Park, K. H., Jeon, T., Jeon, G. W., Kim, S., Lee, S. W., Wu, S., Park, D. H., Jung, S. C., Kim, D. Y., & Jang, J. W. (2023). Band Alignment Enabling Effective Charge Transfer for the Highly Enhanced Raman Scattering and Fluorescence of Metal-Nanoparticle-Decorated Conjugated Polymer Nanowires. Journal of Physical Chemistry Letters, 14(3), 750-762. https://doi.org/10.1021/acs.jpclett.2c03602

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

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.",

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

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Lee, SH, Park, KH, Jeon, T, Jeon, GW, Kim, S, Lee, SW, Wu, S, Park, DH, Jung, SC, Kim, DY & Jang, JW 2023, 'Band Alignment Enabling Effective Charge Transfer for the Highly Enhanced Raman Scattering and Fluorescence of Metal-Nanoparticle-Decorated Conjugated Polymer Nanowires', Journal of Physical Chemistry Letters, vol. 14, no. 3, pp. 750-762. https://doi.org/10.1021/acs.jpclett.2c03602

Band Alignment Enabling Effective Charge Transfer for the Highly Enhanced Raman Scattering and Fluorescence of Metal-Nanoparticle-Decorated Conjugated Polymer Nanowires. / Lee, Seung Hoon; Park, Ki Hong; Jeon, Taegon et al.
In: Journal of Physical Chemistry Letters, Vol. 14, No. 3, 26.01.2023, p. 750-762.

Research output: Contribution to journal › Article › peer-review

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T1 - Band Alignment Enabling Effective Charge Transfer for the Highly Enhanced Raman Scattering and Fluorescence of Metal-Nanoparticle-Decorated Conjugated Polymer Nanowires

AU - Lee, Seung Hoon

AU - Park, Ki Hong

AU - Jeon, Taegon

AU - Jeon, Gi Wan

AU - Kim, Seokho

AU - Lee, Seung Woo

AU - Wu, Sangwook

AU - Park, Dong Hyuk

AU - Jung, Sung Chul

AU - Kim, Deuk Young

AU - Jang, Jae Won

PY - 2023/1/26

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AB - 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.

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

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