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Related Experiment Video

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Molecular Sensing Using Aggregation of Gold Nanoparticles.

Ryosuke Izumi1, Yuki Tanaka1, Tamotsu Zako1

  • 1Department of Chemistry and Biology, Graduate School of Science and Engineering, Ehime University, Bunkyo 2-5, Matsuyama, Ehime, 790-8577, Japan.

Chembiochem : a European Journal of Chemical Biology
|November 18, 2025
PubMed
Summary

Gold nanoparticles (AuNPs) offer sensitive molecular detection through aggregation or dispersion. This review covers AuNP sensing strategies, focusing on surface modification and aggregation mechanisms for various applications.

Keywords:
aggregationcolorimetric sensordark‐field microscopygold nanoparticlesmolecular detection

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Area of Science:

  • Nanotechnology and Materials Science
  • Analytical Chemistry
  • Biomedical Engineering

Background:

  • Gold nanoparticles (AuNPs) possess unique optical properties and surface modifiability, making them valuable for molecular sensing.
  • AuNP-based sensors leverage target molecule interactions to induce aggregation, dispersion, or assembly, altering optical or electrochemical signals.
  • These changes are detectable via colorimetric shifts, surface-enhanced Raman scattering (SERS), electrochemical methods, and scattering intensity variations.

Purpose of the Study:

  • To review molecular detection strategies utilizing gold nanoparticles.
  • To focus on the critical roles of surface modification and aggregation mechanisms in AuNP sensor design.
  • To present representative applications of AuNP-based sensing techniques.

Main Methods:

  • Review of literature on gold nanoparticle synthesis and functionalization for sensing.
  • Analysis of aggregation and dispersion mechanisms triggered by target molecules.
  • Categorization of detection methods including colorimetric assays, SERS, electrochemical techniques, and dark-field microscopy.

Main Results:

  • Gold nanoparticles enable highly sensitive and selective molecular detection.
  • Surface modification strategies are key to tailoring AuNP sensors for specific targets.
  • Aggregation and dispersion phenomena provide measurable optical and electrochemical readouts.

Conclusions:

  • Gold nanoparticles are versatile platforms for advanced molecular sensing.
  • Understanding surface modification and aggregation is crucial for optimizing AuNP sensor performance.
  • The reviewed methods offer diverse approaches for sensitive and selective molecular detection across various fields.