Directly measured high in-plane thermal conductivity of two-dimensional covalent organic frameworks
Two-dimensional covalent organic frameworks are promising low-density porous materials for lightweight thermal management, yet comprehensive thermal conductivity measurements remain scarce. Particularly, direct in-plane thermal conductivity data for large-area, fully suspended covalent organic framework thin films has not been reported previously. This study addresses this gap by measuring in-plane and cross-plane thermal conductivities of two-dimensional covalent organic frameworks with varying pore sizes using laser-based pump-probe techniques. Transient thermal grating spectroscopy revealed a high in-plane thermal conductivity of 1.18 ± 0.21 W/(m⋅K) for a sample with a 1.4 nm pore size, highlighting a notable pore size effect. Cross-plane thermal conductivity measured via frequency-domain thermoreflectance indicated weak thermal anisotropy for samples with larger pores. Grazing-incident wide-angle X-ray scattering provided structural insights and clarified heat conduction mechanisms. These direct in-plane thermal conductivity measurements enhance understanding of thermal transport behaviors in covalent organic frameworks, supporting their development as advanced thermal management materials.
Authors
- Ly D. Tran (ORCID: https://orcid.org/0000-0003-4443-3839)
- Ajit K. Roy (ORCID: https://orcid.org/0000-0002-3344-7437)
- Eugene Jeong (ORCID: https://orcid.org/0000-0001-8272-3998)
- Jun Lou (ORCID: https://orcid.org/0000-0002-4351-9561)
- Yu Zhong (ORCID: https://orcid.org/0000-0002-2363-7093)
- Joyce Christiansen‐Salameh (ORCID: https://orcid.org/0000-0001-9124-7006)
- Kirt A. Page (ORCID: https://orcid.org/0009-0000-7835-7657)
- Jinghang Dai (ORCID: https://orcid.org/0000-0003-0215-7602)
- Nicholas R. Glavin (ORCID: https://orcid.org/0000-0002-9447-7509)
- Md. Sherajul Islam (ORCID: https://orcid.org/0000-0002-6717-2523)
- Gustavo A. Alvarez (ORCID: https://orcid.org/0000-0001-7885-8275)
- Samuel M. Kielar
- Zhiting Tian (ORCID: https://orcid.org/0000-0002-5098-7507)
- Qiyi Fang (ORCID: https://orcid.org/0000-0001-8435-636X)
- Dayanni D. Bhagwandin
- Jiyoung Kim (ORCID: https://orcid.org/0000-0002-0163-1598)
- Jinha Kwon (ORCID: https://orcid.org/0000-0002-5251-7410)
- Amelia F. Schaeffer (ORCID: https://orcid.org/0000-0003-2268-2965)
Institutions
- Cornell University (US)
- Wright-Patterson Air Force Base (US)
- Dayton Clinical Oncology Program (US)
- Spectral Energies (United States) (US)
- Rice University (US)
Publication Details
- Journal
- Nature Communications
- Published
- 2025-07-14
- DOI
- https://doi.org/10.1038/s41467-025-61334-8
- Citations
- 9
- Primary Topic
- Thermal properties of materials
- Type
- article
- Field-Weighted Citation Impact
- 4.66
Funders
- Semiconductor Research Corporation
- Defense Advanced Research Projects Agency
- Defense Sciences Office, DARPA