Fabrication and Thermal Characterization of Copper Nanowires (CuNWs) Thermal Interface Materials Tapes

High-performing thermal interface material (TIM) that exhibits both high thermal conductivity and high mechanical compliance is a crucial component in modern electronics. This paper specifically focuses on the fabrication and characterization of Copper Nanowires/Polydimethylsiloxane (CuNWs/PDMS) com...

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Bibliographic Details
Main Authors: Jiang, Kaiying, Kwon, Heungdong, Qiao, Hansen, He, Yini, Asheghi, Mehdi, Goodson, Kenneth
Format: Conference Proceeding
Language:English
Subjects:
Coatings
contact resistance
Copper
copper nanowire
Electrical resistance measurement
Fabrication
gallium-based liquid metal
Liquids
Semiconductor device measurement
Sensitivity
Thermal conductivity
thermal interface material
Thermal management of electronics
Thermal resistance
TIM tester(ASTM D5470)
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Summary:High-performing thermal interface material (TIM) that exhibits both high thermal conductivity and high mechanical compliance is a crucial component in modern electronics. This paper specifically focuses on the fabrication and characterization of Copper Nanowires/Polydimethylsiloxane (CuNWs/PDMS) composites as a promising TIM. The first section of the paper discusses the shortcomings of existing fabrication methods for CuNWs and proposes a novel on-PCTE evaporative coating method. CuNWs and CuNWs/PDMS of 25-50 gm thick with NW diameter 0.1-0.25 gm and density 107-108 cm -2 were fabricated at a high yield rate. The second part focuses on the thermal characterization of CuNWs, highlighting the source of uncertainty in traditional measurement methods[6] and introducing an approach using TIM testers coupled with Infrared (IR) thermography. In the final section, the paper emphasizes the significance of minimizing dry contact resistance(~10 -4 m 2 KW -1 ) in thermal resistance measurements of CuNWs, which have an expected thermal resistance of ~10 -6 m 2 KW -1 . The paper explores the application of gallium-based liquid metal (LM) to mitigate this issue. The results show promising advancements in characterizing low-resistance TIM materials and concluded that the CuNWs (or CuNWs/PDMS tape) have thermal resistance at least one order of magnitude smaller than 10 -5 m 2 KW -1 . Further investigation into the roughness and material of the LM-wetted surface should be done to improve LM-wetting condition and enhance measurement sensitivity.
ISSN:2694-2135
DOI:10.1109/ITherm55375.2024.10709516