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<p>The development of sustainable nanomaterials that combine facile synthesis with multifunctional performance remains a critical challenge in advanced composites. Herein, we present a controllable and eco-friendly strategy for synthesizing self-dispersing gold nanoparticles (AuNPs) using plant polyphenols and their subsequent integration into polyurethane (PU) matrices to create high-performance multifunctional coatings. Tannic acid (TA) or epigallocatechin gallate (EGCG) serves as dual reducing and stabilizing agents in a one-step aqueous synthesis, yielding AuNPs with uniform spherical morphology (50 ± 5&#xa0;nm diameter) and exceptional colloidal stability (zeta potential &gt;|30&#xa0;mV|) without post-synthesis modification. Through systematic optimization, ideal conditions were identified at pH 6.0 with molar ratios of 1:8 (TA/Au<sup>3+</sup>) and 1:6 (EGCG/Au<sup>3+</sup>), achieving notable photothermal conversion efficiencies of 32.46% and 45.78%, respectively. The polyphenol-mediated surface chemistry allows spontaneous integration of AuNPs into aqueous PU matrices, resulting in composite coatings that exhibit a temperature increase exceeding 30&#xa0;°C under 808&#xa0;nm laser irradiation, inhibit 85–99% of bacterial growth against both <i>S. aureus</i> and <i>E. coli</i>, and display a 420% enhancement in abrasion resistance, all while maintaining the intrinsic hydrophobicity of the polymer (contact angle change ≤ 5°). This work demonstrates a sustainable and scalable strategy for producing multifunctional composites via green-synthesized, self-dispersing AuNPs.</p>

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Plant polyphenol-mediated self-dispersing gold nanoparticles as a green platform for multifunctional polyurethane composites

  • 期刊论文

  • 发表日期：

    2025年10月25日

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  • Zijun Zhu,
  • Qingsong Wang,
  • Yawen Huang,
  • Lantao He,
  • Jianwu Lan,
  • Shaojian Lin,
  • Jiaojiao Shang

摘要

The development of sustainable nanomaterials that combine facile synthesis with multifunctional performance remains a critical challenge in advanced composites. Herein, we present a controllable and eco-friendly strategy for synthesizing self-dispersing gold nanoparticles (AuNPs) using plant polyphenols and their subsequent integration into polyurethane (PU) matrices to create high-performance multifunctional coatings. Tannic acid (TA) or epigallocatechin gallate (EGCG) serves as dual reducing and stabilizing agents in a one-step aqueous synthesis, yielding AuNPs with uniform spherical morphology (50 ± 5 nm diameter) and exceptional colloidal stability (zeta potential >|30 mV|) without post-synthesis modification. Through systematic optimization, ideal conditions were identified at pH 6.0 with molar ratios of 1:8 (TA/Au3+) and 1:6 (EGCG/Au3+), achieving notable photothermal conversion efficiencies of 32.46% and 45.78%, respectively. The polyphenol-mediated surface chemistry allows spontaneous integration of AuNPs into aqueous PU matrices, resulting in composite coatings that exhibit a temperature increase exceeding 30 °C under 808 nm laser irradiation, inhibit 85–99% of bacterial growth against both S. aureus and E. coli, and display a 420% enhancement in abrasion resistance, all while maintaining the intrinsic hydrophobicity of the polymer (contact angle change ≤ 5°). This work demonstrates a sustainable and scalable strategy for producing multifunctional composites via green-synthesized, self-dispersing AuNPs.