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<p>The thermal behaviour of ligand-stabilised gold nanoparticles (AuNPs) is an important consideration when using these materials to form gold films via sintering. AuNPs stabilised with butanethiol and hexadecanethiol ligands displayed quite different properties upon heating up to their sintering temperatures. Films of AuNPs bearing the longer chain stabilising ligand hexadecanethiol become liquids at 56 °C. This temperature corresponds to the melting point of dihexadecyl disulfide, a known product that forms when such AuNPs are heated. No liquid phase was observed for butanethiol-stabilised AuNPs at any temperature. Films of the hexadecanethiol-stabilised AuNPs had high resistances (&gt; 100 MΩ) at room temperature and the short-chain butanethiol-stabilised AuNPs had resistances in the kΩ range. Small-angle X-ray scattering data showed that the butanethiol-stabilised AuNPs begin to coarsen at ~ 140 °C whilst the hexadecanethiol particles began to coarsen ~ 90 °C.</p>

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Nano to macro transition of gold nanoparticles prior to sintering

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月1日

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  • Paige Summers,
  • Alexander Angeloski,
  • Michael B. Cortie,
  • Richard Wuhrer,
  • Andrew M. McDonagh

摘要

The thermal behaviour of ligand-stabilised gold nanoparticles (AuNPs) is an important consideration when using these materials to form gold films via sintering. AuNPs stabilised with butanethiol and hexadecanethiol ligands displayed quite different properties upon heating up to their sintering temperatures. Films of AuNPs bearing the longer chain stabilising ligand hexadecanethiol become liquids at 56 °C. This temperature corresponds to the melting point of dihexadecyl disulfide, a known product that forms when such AuNPs are heated. No liquid phase was observed for butanethiol-stabilised AuNPs at any temperature. Films of the hexadecanethiol-stabilised AuNPs had high resistances (> 100 MΩ) at room temperature and the short-chain butanethiol-stabilised AuNPs had resistances in the kΩ range. Small-angle X-ray scattering data showed that the butanethiol-stabilised AuNPs begin to coarsen at ~ 140 °C whilst the hexadecanethiol particles began to coarsen ~ 90 °C.