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 heat produced by the surrounding components.

The production of micron-thick films with high quality is not an easy task. It is a complex process. The material must be able to resist 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, researchers used a process called chemical vapour deposition (CVD), to grow thin graphite films on 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 nickel foil’s surface is only 100 micrometers thick.

The team refers to these films as nano-thick (NGFs), and they are made by heating the material up to about 900degC. In this process graphite film is formed on the foil’s two sides, and can be grown into sheets of up to 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 atop the nickel surface. The researchers stated that observing graphite films on nickel foils is an unprecedented accomplishment that will clarify the growth mechanism for 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 NO2gas.

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

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