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Related Experiment Video

Updated: Jul 5, 2026

Large Area Substrate-Based Nanofabrication of Controllable and Customizable Gold Nanoparticles Via Capped Dewetting
05:51

Large Area Substrate-Based Nanofabrication of Controllable and Customizable Gold Nanoparticles Via Capped Dewetting

Published on: February 26, 2019

Controlled interparticle spacing for surface-modified gold nanoparticle aggregates.

Soumen Basu1, Surojit Pande, Subhra Jana

  • 1Department of Chemistry, Indian Institute of Technology, Kharagpur-721302, India.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 23, 2008
PubMed
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This study investigates gold nanoparticle aggregation induced by 2-aminothiophenol (ATP). Findings show that nanoparticle size, pH, and ATP concentration influence aggregation and optical properties, with SERS revealing interparticle spacing.

Area of Science:

  • Nanotechnology
  • Materials Science
  • Spectroscopy

Background:

  • Gold nanoparticles (AuNPs) exhibit unique optical properties influenced by their size and aggregation state.
  • 2-aminothiophenol (ATP) acts as a capping agent, affecting nanoparticle stability and interparticle interactions.
  • Understanding nanoparticle aggregation is crucial for controlling their optical and functional characteristics.

Purpose of the Study:

  • To investigate the aggregation of gold nanoparticles (AuNPs) induced by 2-aminothiophenol (ATP).
  • To examine the influence of AuNP size and ATP concentration on aggregation behavior and optical responses.
  • To correlate surface-enhanced Raman scattering (SERS) spectra with interparticle distances in aggregated AuNPs.

Main Methods:

  • UV-vis absorption spectroscopy to study optical properties.

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Last Updated: Jul 5, 2026

Large Area Substrate-Based Nanofabrication of Controllable and Customizable Gold Nanoparticles Via Capped Dewetting
05:51

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Published on: February 26, 2019

A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions
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Gold Nanoparticle Synthesis
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Published on: July 10, 2021

  • Surface-enhanced Raman scattering (SERS) to probe molecular vibrations and interparticle spacing.
  • Transmission electron microscopy (TEM) and X-ray diffraction (XRD) for structural characterization.
  • Zeta-potential and particle size measurements to assess aggregate stability and dimensions.

    • Main Results:

    • ATP adsorption on AuNPs leads to aggregation, with capping properties observed in acidic pH.
    • Nanoparticle size (8-55 nm) significantly impacts aggregation nature and optical response due to interparticle coupling.
    • Aggregate size, interparticle distances, and absorption bands are dependent on pH and ATP concentration.
    • SERS spectra of ATP provide insights into interparticle spacing, with varying signal intensities for different AuNP sizes.

    Conclusions:

    • The study elucidates the mechanism of ATP-induced gold nanoparticle aggregation.
    • Control over aggregation and optical properties can be achieved by tuning pH, ATP concentration, and nanoparticle size.
    • SERS is a valuable tool for characterizing interparticle distances and understanding optical coupling in nanoparticle aggregates.