Skip to content
6CCVD Research

Anomalously strong size effect on thermal conductivity of diamond microparticles

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2024-07-22
JournalApplied Physics Letters
AuthorsYufeng Wang, Bo Sun
InstitutionsTsinghua University
Citations8

Abstract

Section titled ā€œAbstractā€

Diamond has the known highest thermal conductivity of around 2000 W māˆ’1 Kāˆ’1 and is, therefore, widely used for heat dissipation. In practical applications, synthetic diamond microparticles are usually assumed to have similar thermal conductivity to that of bulk diamond because the particle size is larger than the theoretical phonon mean free path, so that boundary scattering of heat-carrying phonons is absent. In this report, we find that the thermal conductivity of diamond microparticles anomalously depends on their sizes. The thermal conductivity of diamond microparticles increases from 400 to 2000 W māˆ’1 Kāˆ’1 with the size growing from 20 to 300 Ī¼m. We attribute the abnormally strong size effect to the long-range defects during the growth process based on analysis of point defects, dislocations, and thermal penetration depth dependence of thermal conductivity. Our results play a vital role in the design of diamond composites and in the improvement of the thermal conductivity of synthetic diamonds.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
  1. 1993 - Thermal conductivity of diamond between 170 and 1200 K and the isotope effect [Crossref]
  2. 2018 - Thermal conductivity of high purity synthetic single crystal diamonds [Crossref]
  3. 2022 - Research progress in interface modification and thermal conduction behavior of diamond/metal composites [Crossref]
  4. 2008 - Thermal conductivity of diamond composites sintered under high pressures [Crossref]
  5. 2022 - Exploring the underlying causes of optimizing thermal conductivity of copper/diamond composites by interface thickness [Crossref]
  6. 2013 - On the thermal conductivity of Cu-Zr/diamond composites [Crossref]
  7. 2010 - Thermal conductivity of SPS consolidated Cu/diamond composites with Cr-coated diamond particles [Crossref]
  8. 2013 - Fabrication of diamond/aluminum composites by vacuum hot pressing: Process optimization and thermal properties [Crossref]
  9. 2018 - Enhanced thermal conductivity of diamond/aluminum composites through tuning diamond particle dispersion [Crossref]
  10. 2021 - Reinforcement size effect on thermal conductivity in Cu-B/diamond composite [Crossref]

Reads Similar to This

Molecular dynamics simulation of thermal conductivity of diamond/epoxy resin composites High-Resolution Thermoreflectance Imaging Investigation of Self-Heating in AlGaN/GaN HEMTs on Si, SiC, and Diamond Substrates Diamondā€Reinforced Al(H2PO4)3@Epoxy Hybrid Thermal Adhesive With Ultraā€High Thermal Conductivity and Bonding Strength