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Shell-Isolated Nanoparticle-Enhanced Phosphorescence.

Meng Meng1, Fan-Li Zhang1, Jun Yi1

  • 1MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, Department of Physics, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China.

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|August 24, 2018
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Summary
This summary is machine-generated.

Shell-isolated nanoparticles overcome metal quenching in plasmon-enhanced fluorescence. This novel shell-isolated nanoparticle enhanced phosphorescence (SHINEP) technique achieves significant spectral intensity enhancement for improved analysis and imaging.

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Area of Science:

  • Plasmonics and Nanotechnology
  • Optical Spectroscopy
  • Materials Science

Background:

  • Plasmonics enhances optical technologies like plasmon-enhanced spectroscopy (PES).
  • Metal quenching in plasmon-enhanced fluorescence (PEF) limits analytical and imaging applications.
  • Silver core silica shell-isolated nanoparticles (Ag@SiO2 NPs or SHINs) offer a solution to metal quenching.

Purpose of the Study:

  • To investigate the interaction between nanoparticles and emitters using coupling and noncoupling modes.
  • To explore the potential of shell-isolated nanoparticle enhanced phosphorescence (SHINEP) for overcoming fluorescence quenching.
  • To demonstrate the efficacy of tunable shell thickness in Ag@SiO2 NPs for PEF applications.

Main Methods:

  • Fabrication of silver core silica shell-isolated nanoparticles (Ag@SiO2 NPs) with tunable shell thickness.
  • Construction of plasmonic coupling and noncoupling modes between NPs and silver film.
  • Experimental measurements of spectral intensity enhancement and radiative emission rate acceleration.
  • Theoretical validation using finite-element method (FEM) calculations.

Main Results:

  • Plasmonic coupling between Ag@SiO2 NPs and Ag film resulted in a 330-fold spectral intensity enhancement.
  • A 124-fold acceleration of the radiative emission rate was observed in SHINEP.
  • Tunable shell thickness effectively controlled the interaction between NPs and emitters.
  • FEM calculations supported the experimental findings on plasmon-emitter interactions.

Conclusions:

  • SHINEP provides a novel approach to understanding plasmon-phosphorescence interactions.
  • The developed Ag@SiO2 NPs effectively mitigate metal quenching in PEF.
  • SHINEP demonstrates significant potential for surface detection analysis.
  • This technique holds promise for singlet-oxygen-based clinical therapy applications.