Blocking plasmon-molecule charge transfer using surface ligands

Terefe G. Habteyes; Hamed Kookhaee; Tefera Tesema

doi:10.1117/12.2594606

2 August 2021 Blocking plasmon-molecule charge transfer using surface ligands

Terefe G. Habteyes, Hamed Kookhaee, Tefera Tesema

Proceedings Volume 11797, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIX; 117970U (2021) https://doi.org/10.1117/12.2594606
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States

Abstract

We will present the manifestations of plasmon-molecule energy and electron transfer processes as observed surface enhanced Raman spectroscopy (SERS). We observe that in presence of intermediary surface ligands, the electron transfer channel is turned off. On the other hand, the presence of surface ligands facilitates plasmon to molecule energy transfer (plasmon pumped adsorbate intramolecular electronic excitation) by orienting the analyte molecules along the surface field vector as well as by prolonging the excited state lifetime. The adsorbate excitation appears to be followed by singlet to triplet intersystem crossing that leads to singlet oxygen generation that initiates N-demethylation reaction as demonstrated using the reactivity of methylene.

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Terefe G. Habteyes, Hamed Kookhaee, and Tefera Tesema "Blocking plasmon-molecule charge transfer using surface ligands", Proc. SPIE 11797, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIX, 117970U (2 August 2021); https://doi.org/10.1117/12.2594606

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KEYWORDS

Adsorption

Energy transfer

Molecular energy transfer

Nanoparticles

Near field

Plasmons

Gold

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