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Plasmonic Assemblies for Real-Time Single-Molecule Biosensing.

Rachel E Armstrong1, Matěj Horáček1, Peter Zijlstra1

  • 1Department of Applied Physics & Institute for Complex Molecular Systems, Eindhoven University of Technology, Postbus 513, Eindhoven, MB, 5600, the Netherlands.

Small (Weinheim an Der Bergstrasse, Germany)
|December 1, 2020
PubMed
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This summary is machine-generated.

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Plasmonic assemblies enable advanced real-time single-molecule sensing with enhanced signal strength and broader timescale access. These sensors offer unique capabilities for studying molecular dynamics, complementing existing techniques.

Area of Science:

  • Plasmonics and Nanotechnology
  • Biophysics and Biosensing

Background:

  • Plasmonic assemblies possess tunable optical properties and versatile surface functionalization, driving applications in biosensing, nonlinear optics, and photonics.
  • Significant progress has been made in utilizing plasmonic assemblies for real-time single-molecule sensing, offering advantages over individual nanoparticles.

Purpose of the Study:

  • To review the development of real-time single-molecule sensors based on plasmonic assemblies.
  • To highlight recent applications, discuss current challenges, and propose solutions for advancing plasmonic assembly-based sensing.

Main Methods:

  • Overview of the optical properties of plasmonic assemblies.
  • Description of recent applications in single-molecule detection and dynamics studies.
  • Analysis of sensor stability, specificity, and sensitivity.
Keywords:
biosensingmicroscopyoptical spectroscopyplasmonicssingle molecules

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Main Results:

  • Plasmonic assemblies provide stronger signals, better optical control, and access to wider timescales compared to individual particles.
  • These assemblies have been successfully employed to study single-molecule interactions, mechanical properties, and conformational dynamics.
  • The sensors demonstrate stability, specificity, and sensitivity, offering a complementary approach to techniques like force spectroscopy and single-molecule fluorescence.

Conclusions:

  • Plasmonic assemblies are powerful tools for real-time single-molecule sensing, revealing molecular behaviors across diverse timescales.
  • Future applications are expected to extend into ultralong (hours) and ultrashort (sub-millisecond) time windows, addressing limitations of current methods.
  • Continued development promises to enhance the impact of plasmonic assembly sensors in biophysics and nanotechnology.