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Author Spotlight: Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy
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Electrospray deposition for single nanoparticle studies.

Gargi S Jagdale1, Myung-Hoon Choi1, Natasha P Siepser1

  • 1Department of Chemistry, Indiana University, 800 E Kirkwood Avenue, Bloomington, IN 47408, USA. lanbaker@indiana.edu.

Analytical Methods : Advancing Methods and Applications
|September 23, 2021
PubMed
Summary
This summary is machine-generated.

Electrospray deposition effectively creates isolated nanoparticles for nanoscale studies. Optimizing spray distance, current, and tip diameter enhances single nanoparticle deposition yield and density.

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Area of Science:

  • Nanotechnology
  • Electrochemistry
  • Surface Science

Background:

  • Single entity electrochemical (SEE) studies require isolated nanoparticles to probe nanoscale activities and heterogeneity.
  • Achieving single, isolated nanoparticles is crucial for advancing SEE techniques.
  • Electrospray (ES) deposition offers a method for depositing nanoparticles using simple instrumentation.

Purpose of the Study:

  • To investigate the role of electrospray parameters in the deposition of single gold nano-octahedra (Au ODs).
  • To analyze how spray distance, ES current, and emitter tip diameter influence the deposition of isolated Au ODs.
  • To determine optimal conditions for achieving high percentages of single nanoparticle deposition.

Main Methods:

  • Utilized electrospray deposition of colloidal nanoparticle solutions to achieve single, isolated nanoparticles.
  • Systematically varied three electrospray parameters: spray distance, ES current, and emitter tip diameter.
  • Analyzed deposition results by quantifying the percentage of single nanoparticles and their local surface density.

Main Results:

  • Local surface density of Au ODs increased with decreased spray distance and tip diameter, and increased ES current.
  • Percentage of single particle deposition increased with increased spray distance and decreased tip diameter.
  • ES current showed no significant effect on the percentage of single Au OD deposition within the tested range.
  • Optimal conditions yielded a local surface density of 0.26 ± 0.05 single particles/μm² and 96.3% single Au OD deposition.

Conclusions:

  • Electrospray deposition is a viable method for preparing samples with isolated nanoparticles for SEE studies.
  • Spray distance and emitter tip diameter are key parameters for controlling single nanoparticle deposition.
  • Optimized ES parameters can achieve high-quality, isolated nanoparticle deposition suitable for nanoscale electrochemical analysis.