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Thermal Transport through Polymer-Linked Gold Nanoparticles.

Xingfei Wei1, Ewa Harazinska1, Yinong Zhao2

  • 1Department of Chemistry, Johns Hopkins University, Baltimore, Maryland21218, United States.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|November 11, 2022
PubMed
Summary

We investigated thermal transport in polymer-nanoparticle networks using molecular dynamics. Stiffer conjugated polymers and lower temperatures enhance heat conductance (G) in gold nanoparticle (AuNP) dimers.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Polymer-nanoparticle networks are promising for molecular electronics and nanophononics.
  • Understanding thermal transport at the nanoscale is crucial for designing advanced materials.

Purpose of the Study:

  • To elucidate the molecular-level mechanisms governing thermal transport in polymer-linked gold nanoparticle (AuNP) dimers.
  • To investigate the influence of polymer properties and system parameters on heat conductance (G).

Main Methods:

  • All-atom molecular dynamics simulations were employed.
  • Heat conductance (G) was calculated for AuNP dimers linked by six different polymers of varying stiffness.
  • Effects of AuNP size, polymer chain length, conformation, temperature, and number of linking polymers were analyzed.

Main Results:

  • Heat conductance (G) is significantly influenced by phonon boundary and intrinsic scattering mechanisms.
  • Conjugated polymers exhibit higher G due to backbone stiffness.
  • G is higher at low temperatures due to restricted segmental rotations.
  • Total G shows additive behavior with an increasing number of linking polymers (1, 2, or 3).

Conclusions:

  • Polymer stiffness and temperature are key factors controlling thermal transport in polymer-AuNP systems.
  • The findings provide fundamental insights into nanoscale thermal management for electronic and phononic devices.