Seminar entitled Atomic scale manipulation and characterization of graphene and functionalization for achieving maximum thermal conductivity
|Dates:||26 February 2019|
|Times:||15:00 - 16:00|
|What is it:||Seminar|
|Organiser:||Department of Materials|
|Who is it for:||University staff|
|Speaker:||Professor Johan Liu|
Graphene, due to its exceptional mechanical, optical, electrical, physical and thermal properties, has attracted strong interest for both fundamental studies and real applications. Among all these properties, the extraordinary high in-plane thermal conductivity makes
graphene an ideal cooling material for power devices and systems.
To date, it has been reported that graphene film in micron thickness range can offer an in-plane thermal conductivity up to 3200 W/mK while thermal conductivity out-of-plane reaches only close to 15W/mK. Here, we found that the thermal conductivity strongly
depends on the film thickness due to increased amount of defects, wrinkles and air pockets with increasing film thickness.
In addition to this, a strong phonon coupler is important in allowing heat transfer from graphene to attached substrate. In this context, I will elaborate the effect of molecular weight and chemical spices on the efficiency of heat transfer.
Finally, I present a number of thermal measurement techniques and discuss the advantage and disadvantage of these different methods. I will finish my talk by proposing a standardized method to measure graphene based materials for cooling applications.
Professor Johan Liu
Role: Chalmers University of Technology
Travel and Contact Information
3rd Floor Seminar Room
The University of Manchester
National Graphene Institute,
Booth St East