Synthesis of a Graphene Carbon Nanotube Hybrid Film by Joule Self-heating CVD for Thermal Applications
Paper in proceedings, 2018

Hybrid films based on vertically aligned carbon nanotubes (CNTs) on graphene or graphite sheets have been proposed for application as thermal interface materials and micro heat sinks. However, the fabrication of these materials are limited to small scale, expensive and complicated chemical vapor deposition (CVD) for CNT synthesis. We present a new method for direct growth of CNTs on one or both sides of a thin graphene film (GF) using joule self-heating of the graphene film to provide the necessary heat for the thermal breakdown of carbon feedstock in a CVD process. The resulting CNT forests show good density and alignment consistent with regular CVD synthesis processes on silicon surfaces. The resulting double sided GF/CNT hybrid film is directly applicable as a thermal pad. The CNT forest has a thermal conductivity of 30 W/mK, measured by pulsed photothermal reflectance, and the total thermal interface resistance between aluminum blocks was measured to be 60 Kmm 2 /W using an ASTM D5470 compliant 1-D measurement setup. This method of directly synthesizing CNTs on graphene films is more energy efficient and capable of larger volume production compared to traditional CVD methods. It is also compatible with scaling up towards continuous roll-to-roll production for large scale commercial production, one of the major limitations preventing CVD-grown CNTs from commercial applications

Surface topography

Heating systems

Substrates

Thermal resistance

Thermal conductivity

Graphene

Author

Josef Hansson

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems Laboratory

Majid Kabiri Samani

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems Laboratory

Andreas Nylander

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems Laboratory

Lilei Ye

Nan Wang

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems Laboratory

Torbjörn Nilsson

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems Laboratory

Johan Liu

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems Laboratory

Proceedings of 2018 IEEE 68th Electronic Components and Technology Conference (ECTC)

23775726 (ISSN)

2018 IEEE 68th Electronic Components and Technology Conference (ECTC)
San Diego, USA,

Subject Categories

Nano Technology

Other Materials Engineering

DOI

10.1109/ECTC.2018.00369

More information

Created

10/21/2019