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<p>The fabrication of high-performance functional polymer composites requires delicate balance between functionalities, filler content and overall performance, and preparation route is urgently needed. Guided by Simmons theory, a PDMS-based stretchable conductor with metal-level conductivity is realized through a strategy by combining silver nanoparticle in-situ formation, optimized barrier height and volume excluding effect. Firstly, a universal matrix-independent etching-reduction method generates uniform Ag nanoparticles (~ 9.7 nm), shortening tunneling distances. Then, tunneling barrier height is minimized to 0.06 eV by aligning energy levels of surface-treated silver nanoflakes and PDMS, reducing electron scattering. Finally, silver-plated PDMS microspheres act as volume-excluding phase, compressing tunneling widths below the critical threshold (&lt;10 nm). This integrated approach yields exceptional electrical conductivity (29429 S/cm) at 50 wt% Ag loading. Such tunneling networks retain 53% conductivity at 100% strain, while thermal conductivity increases from 4.3 to 24.3 W/m·K. This work demonstrates rational quantum tunneling barrier control to overcome performance trade-offs, providing a design framework for advanced conductive composites.</p>

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Designing functional filler networks via in situ silver nanoparticles through barrier tuning and volume exclusion

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月12日

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  • Ke Tian,
  • Jianwei Jing,
  • Ming Wen,
  • Liping Zhang,
  • Qianyang Li,
  • Minhan Cheng,
  • Jie Wen,
  • Yiming Wen,
  • Yong Wen,
  • Qiang Fu,
  • Hua Deng

摘要

The fabrication of high-performance functional polymer composites requires delicate balance between functionalities, filler content and overall performance, and preparation route is urgently needed. Guided by Simmons theory, a PDMS-based stretchable conductor with metal-level conductivity is realized through a strategy by combining silver nanoparticle in-situ formation, optimized barrier height and volume excluding effect. Firstly, a universal matrix-independent etching-reduction method generates uniform Ag nanoparticles (~ 9.7 nm), shortening tunneling distances. Then, tunneling barrier height is minimized to 0.06 eV by aligning energy levels of surface-treated silver nanoflakes and PDMS, reducing electron scattering. Finally, silver-plated PDMS microspheres act as volume-excluding phase, compressing tunneling widths below the critical threshold (<10 nm). This integrated approach yields exceptional electrical conductivity (29429 S/cm) at 50 wt% Ag loading. Such tunneling networks retain 53% conductivity at 100% strain, while thermal conductivity increases from 4.3 to 24.3 W/m·K. This work demonstrates rational quantum tunneling barrier control to overcome performance trade-offs, providing a design framework for advanced conductive composites.