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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
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  • In category "Seminar"
  • By Department of Materials

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.

Speaker

Professor Johan Liu

Role: Chalmers University of Technology

Travel and Contact Information

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3rd Floor Seminar Room
NGI
The University of Manchester National Graphene Institute, Booth St East
Manchester

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Andrey Kretinin

andrey.kretinin@manchester.ac.uk

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