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Shell-Isolated Nanoparticle-Enhanced Electrochemiluminescence.

Long-Hui Lin1, Jing-Yu Wang1, Chao-Yu You2

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

Small (Weinheim an Der Bergstrasse, Germany)
|August 25, 2022
PubMed
Summary
This summary is machine-generated.

Shell-isolated nanoparticles (SHINs) with thicker, pinhole-free shells were developed to precisely measure surface plasmon resonance (SPR) enhancement in electrochemiluminescence (ECL). This approach achieved a 250-fold signal boost for dopamine detection.

Keywords:
electrochemiluminescencehotspotslayer-by-layer depositionshell-isolated nanoparticlessurface plasmon resonance

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Area of Science:

  • Nanotechnology
  • Analytical Chemistry
  • Electrochemistry

Background:

  • Core-shell nanostructures offer surface plasmon resonance (SPR) for enhanced electrochemiluminescence (ECL).
  • Existing porous shells interfere with accurate SPR enhancement measurements due to core electrocatalysis and shell adsorption.
  • A need exists to isolate SPR effects for precise ECL signal enhancement.

Purpose of the Study:

  • To develop shell-isolated nanoparticles (SHINs) with pinhole-free shells to eliminate interference.
  • To investigate factors influencing hotspot distribution and ECL enhancement.
  • To create high-performance ECL platforms for sensitive analyte detection.

Main Methods:

  • Developed SHINs by optimizing pH and particle concentration for thicker, pinhole-free shells.
  • Engineered ECL platforms with distinct hotspot distributions using electrostatic attraction and layer-by-layer deposition.
  • Investigated excitation intensity and ECL reaction layer thickness for enhanced signal amplification.

Main Results:

  • Achieved the strongest ECL enhancement (≈250-fold) using monolayer SHINs with 10 nm shells.
  • Demonstrated a "turn-off" mode sensing platform for dopamine detection.
  • Established guidelines for shell preparation, interface engineering, and hotspot fabrication.

Conclusions:

  • Precisely unveiled the surface plasmon resonance (SPR) enhanced effect in electrochemiluminescence (ECL) by using shell-isolated nanoparticles (SHINs).
  • Developed optimized SHINs and fabrication methods for superior ECL enhancement and sensitive dopamine detection.
  • Provided new strategies for designing advanced ECL platforms with high performance.