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


Aug 24, 2023

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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. 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. At the same, this complex method is energy intensive. It uses polymers to produce graphite films.

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.

The research team used the technique of 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.

These nano-thick graphite film (NGF) are what the team calls them. They are made by heating up the material around 900degC. In this process graphite is formed on both the front and back of the foil. The sheets can reach a size 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 TEM cross-sectional 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 NO2gas.

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

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