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<p>Choosing appropriate host materials to enhance the stability and catalytic performance of colloidal gold nanoparticles (AuNPs) is crucial for diverse chemical reactions. In this study, a series of poly(N-isopropylacrylamide)-co-polyacrylamide (PNIPAM-co-PAAM) particles are prepared to incorporate guest AuNPs via <i>in situ</i> reduction of gold ions under light irradiation. The formation of AuNPs in the presence of these copolymer particles is thoroughly monitored at room temperature to understand how the polymer network affects the structural features and loading efficiency of the guest AuNPs as a function of PAAM content. The resulting composite particles are also tested as colloidal catalysts in homocoupling reactions to assess the influence of the copolymer matrix. Notably, the formation kinetics of the AuNPs is greatly impacted by the interfacial interactions induced by the copolymer contents containing primary amide groups. However, increasing the number of AAM units in the main PNIPAM network leads to a detectable decrease in both loading efficiency and catalytic performance of the AuNPs, presumably due to a slightly dense and disordered structure of the copolymer network compared to homopolymer particles. Understanding the formation, loading efficiency, and catalytic activity of the guest AuNPs across the host polymer particles provides valuable insights into the structural features of the copolymer matrix and their interfacial interactions. This study experimentally explains the important role of the copolymer network in the <i>in situ</i> formation of metal NPs and their catalytic properties in the development of novel and effective chemical reaction systems.</p> Graphical Abstract <p></p>

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Detrimental effect of host copolymer particle network on the formation and catalytic property of guest gold nanoparticles

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Faith M. Eyimegwu,
  • Jian Hou,
  • Sunghoon Park,
  • Zhicheng Cai,
  • Hyun-Ho Park,
  • Jun-Hyun Kim

摘要

Choosing appropriate host materials to enhance the stability and catalytic performance of colloidal gold nanoparticles (AuNPs) is crucial for diverse chemical reactions. In this study, a series of poly(N-isopropylacrylamide)-co-polyacrylamide (PNIPAM-co-PAAM) particles are prepared to incorporate guest AuNPs via in situ reduction of gold ions under light irradiation. The formation of AuNPs in the presence of these copolymer particles is thoroughly monitored at room temperature to understand how the polymer network affects the structural features and loading efficiency of the guest AuNPs as a function of PAAM content. The resulting composite particles are also tested as colloidal catalysts in homocoupling reactions to assess the influence of the copolymer matrix. Notably, the formation kinetics of the AuNPs is greatly impacted by the interfacial interactions induced by the copolymer contents containing primary amide groups. However, increasing the number of AAM units in the main PNIPAM network leads to a detectable decrease in both loading efficiency and catalytic performance of the AuNPs, presumably due to a slightly dense and disordered structure of the copolymer network compared to homopolymer particles. Understanding the formation, loading efficiency, and catalytic activity of the guest AuNPs across the host polymer particles provides valuable insights into the structural features of the copolymer matrix and their interfacial interactions. This study experimentally explains the important role of the copolymer network in the in situ formation of metal NPs and their catalytic properties in the development of novel and effective chemical reaction systems.

Graphical Abstract