How Does the Heat-spreading Graphite Film Save an Over-heating Mobile Phone?

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The heat dissipation problem of smart phones continues to be a major issue.
In general, thermal management for electronic products and smart phones depends on the use of micron-thick graphite sheets. Their excellent thermal conductivity allows them to neutralize the heat produced by the surrounding components.

The production of micron-thick films with high quality is not an easy task. This involves a complex multi-step procedure. The material must be able resist extreme temperatures of up to 3200degC (5792-degF) in order to create a thin film with a thickness around several Microns. This complicated method, which uses polymers as a source material to produce graphite films, is energy intensive.

Recently, researchers from King Abdullah University of Science and Technology KAUST in Saudi Arabia developed a more efficient method of producing these graphite cooling device.

Specifically, a team of researchers used chemical vapor deposition to grow nanothick graphite film (NGF) onto nickel foil. This technique uses nickel to catalyze the conversion of methane gases into its surface. graphite. It is important to note that the graphite formed on the surface is only 100 micrometers thick.

The team refers to these films as nano-thick (NGF) graphite film, which is created by heating the material up to about 900degC. This process forms graphite on both sides, and the sheets can be as large as 55 square centimeters. These films are easily extracted and can be transferred to another surface.

Alessandro Genovese is an expert in transmission electron microscopy (TEM). The researchers collaborated with him to capture a cross-sectional TEM image of NGF deposited on the surface of nickel. The researchers stated that observing graphite films on nickel foils is an unparalleled achievement, which will help clarify the growth process of these films.

NGF is not only a better and cheaper solution for materials that will be used in future mobile phones for thermal management, but it can also be used in solar cells, or for detection. Sensor material used for NO2 gas.

His research was published in the journals Nanotechnology and Science Reports.

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