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Insights into the Mechanisms of Single-Photon and Two-Photon Excited Surface Enhanced Fluorescence by Submicrometer Silver Particles.
Wang, Yan; Zhang, Feng; Du, Zaifa; Fan, Xinmin; Huang, Xiaodong; Zhang, Lujun; Li, Sensen; Liu, Zhaohong; Wang, Chunyan.
Afiliación
  • Wang Y; School of Physics and Electronic Information, Weifang University, Weifang 261061, China.
  • Zhang F; Weifang Key Laboratory of Laser Technology and Application, Weifang University, Weifang 261061, China.
  • Du Z; College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China.
  • Fan X; School of Physics and Electronic Information, Weifang University, Weifang 261061, China.
  • Huang X; Weifang Key Laboratory of Laser Technology and Application, Weifang University, Weifang 261061, China.
  • Zhang L; School of Physics and Electronic Information, Weifang University, Weifang 261061, China.
  • Li S; Weifang Key Laboratory of Laser Technology and Application, Weifang University, Weifang 261061, China.
  • Liu Z; School of Physics and Electronic Information, Weifang University, Weifang 261061, China.
  • Wang C; Weifang Key Laboratory of Laser Technology and Application, Weifang University, Weifang 261061, China.
Nanomaterials (Basel) ; 14(17)2024 Sep 06.
Article en En | MEDLINE | ID: mdl-39269113
ABSTRACT
Surface enhanced fluorescence (SEF) based on noble metal nanoparticles is an effective means to achieve high sensitivity in fluorescence detection. Currently, the physical mechanism behind enhanced fluorescence is not fully understood. This paper measures the fluorescence signals of Dihydroporphyrin f methyl ether (CPD4) under both single-photon and two-photon excitation based on submicrometer silver particles with rough morphologies, achieving enhancement factors of 34 and 45 times, respectively. On this basis, by combining the radiative field characteristics produced by the silver particles, a stimulated radiation model of molecules is established to elucidate the changes in the molecular photophysical process when influenced by silver particles. Moreover, the fluorescence lifetime of the molecules was measured, showing that the presence of silver particles induces an increase in the molecular radiative decay rate, causing the fluorescence lifetime to decay from 3.8 ns to 3 ns. The results indicate that the fluorescence enhancement primarily originates from the submicrometer silver particles' enhancement effect on the excitation light. Additionally, the fluorescence signal emitted by the molecules couples with the silver particles, causing the local surface plasmon resonances generated by the silver particles to also emit light signals of the same frequency. Under the combined effect, the fluorescence of the molecules is significantly enhanced. The findings provide a theoretical foundation for understanding the fluorescence enhancement mechanism of silver particles, adjusting the enhancement effect, and developing enhanced fluorescence detection devices based on submicrometer silver particles, holding significant practical importance.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nanomaterials (Basel) Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Suiza
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nanomaterials (Basel) Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Suiza