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Related Experiment Video

Updated: Aug 16, 2025

Nanoparticle Tracking Analysis of Gold Nanoparticles in Aqueous Media through an Inter-Laboratory Comparison
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Gold Nanostar Characterization by Nanoparticle Tracking Analysis.

Natasha T Le1, Timothy J M Boskovic1, Marco M Allard2

  • 1Department of Basic Sciences, School of Medicine, Loma Linda University, 11085 Campus Street, Loma Linda, California92350, United States.

ACS Omega
|December 19, 2022
PubMed
Summary
This summary is machine-generated.

Nanoparticle tracking analysis (NTA) quantitatively characterizes gold nanostars (GNSs), revealing size and concentration. This method aids in understanding GNS properties for potential applications in catalysis.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Gold nanostars (GNSs) are anisotropic nanoparticles with unique optical properties.
  • Accurate characterization of GNS size, concentration, and morphology is crucial for their applications.
  • Traditional characterization methods may not fully capture the complexity of heterogeneous nanoparticle samples.

Purpose of the Study:

  • To demonstrate the utility of nanoparticle tracking analysis (NTA) for quantitative characterization of GNSs.
  • To investigate the influence of synthesis parameters on GNS aspect ratio (AR).
  • To establish relationships between GNS properties (size, optical properties) using NTA and UV-vis spectroscopy.

Main Methods:

  • Synthesis of GNSs via a seed-mediated growth method using gold nanoparticles (GNPs) and triblock copolymer (TBP).
  • Characterization of GNSs using nanoparticle tracking analysis (NTA) to determine size, concentration, and scattering intensity.
  • UV-vis spectroscopy was employed to measure extinction spectra and determine molar absorption coefficients (ε400 nm).

Main Results:

  • NTA successfully measured GNS hydrodynamic size, concentration, and relative scattering intensities.
  • GNS aspect ratio (AR) decreased with increasing concentrations of gold nanoparticles in the growth solution.
  • Linear relationships were established between hydrodynamic size, localized surface plasmon peak maxima, and molar absorption coefficients (ε400 nm).

Conclusions:

  • Nanoparticle tracking analysis (NTA) provides a robust method for the quantitative characterization of anisotropic nanoparticles like GNSs.
  • The study highlights the kinetic control in GNS growth influenced by precursor concentrations.
  • NTA combined with UV-vis spectroscopy enables accurate determination of optical properties and establishes predictive relationships for GNSs, paving the way for applications in heterogeneous colloidal catalysis.