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Fluorescence Electrochemical Microscopy: Capping Agent Effects with Ethidium Bromide/DNA Capped Silver Nanoparticles.

Eden E L Tanner1, Stanislav V Sokolov1, Neil P Young2

  • 1University of Oxford, Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK.

Angewandte Chemie (International Ed. in English)
|August 24, 2017
PubMed
Summary

Researchers studied silver nanoparticles capped with DNA and ethidium bromide. They found the capping agent influences nanoparticle oxidation and electron transfer, offering new dynamic insights.

Keywords:
DNAethidium bromidefluorescence microscopysilver nanoparticlessingle nanoparticle electrochemistry

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Area of Science:

  • Nanotechnology
  • Electrochemistry
  • Biophysics

Background:

  • Silver nanoparticles (Ag NPs) are widely used in various applications.
  • Capping agents, such as DNA, control nanoparticle properties and stability.
  • Ethidium bromide intercalation into DNA can alter its structure and interactions.

Purpose of the Study:

  • To investigate the dynamics of DNA capping agents on silver nanoparticles.
  • To understand how ethidium bromide intercalation affects silver nanoparticle electrochemistry.
  • To explore the use of fluorescence microscopy combined with electrochemistry for studying nanoparticle capping agents.

Main Methods:

  • Electrochemical analysis of silver nanoparticles capped with DNA intercalated with ethidium bromide.
  • Fluorescence electrochemical microscopy to observe electron transfer dynamics.
  • Comparison of electrochemical properties of Ag NPs with different capping agents.

Main Results:

  • DNA intercalation with ethidium bromide promoted silver core oxidation at a lower potential (0.50 V vs. Ag) compared to DNA alone (1.15 V vs. Ag).
  • Fluorescence electrochemical microscopy revealed that the capping agent dynamically gates electron transfer from the nanoparticles.
  • Combined techniques provided dynamic insights into capping agent behavior not achievable with electrochemistry alone.

Conclusions:

  • Ethidium bromide intercalation significantly modifies the electrochemical behavior of DNA-capped silver nanoparticles.
  • The capping agent plays a crucial role in controlling electron transfer dynamics at the nanoparticle surface.
  • Fluorescence electrochemical microscopy is a powerful tool for elucidating dynamic processes in nanomaterial-capping agent systems.