Abstract
Thermal management in devices directly affects their performance, but it is difficult to apply conventional cooling methods such as the use of cooling liquids or fans to micro devices owing to the small size of micro devices. In this study, we attempted to solve this problem by employing a heat sink fabricated using copper with porous structures consisting of single-layer graphene on the surface and graphene oxide inside the pores. The porous copper/single-layer graphene/graphene oxide composite (p-Cu/G/rGO) had a porosity of approximately 35%, and the measured pore size was approximately 10 to 100 µm. The internal GO was reduced at a temperature of 1000 °C. On observing the heat distribution in the structure using a thermal imaging camera, we could observe that the p-Cu/G/rGO was conducting heat faster than the p-Cu, which was consistent with the simulation. Furthermore, the thermal resistance of p-Cu/G/rGO was lower than those of the p-Cu and pure Cu. When the p-Cu/G/rGO was fabricated into a heat sink to mount the light emitting diode (LED) chip, the measured temperature of the LED was 31.04 °C, which was less than the temperature of the pure Cu of 40.8 °C. After a week of being subjected to high power (1000 mA), the light intensity of p-Cu/G/rGO decreased to 95.24%. However, the pure Cu decreased significantly to 66.04%. The results of this study are expected to be applied to micro devices for their effective thermal management.
Highlights
Thermal management in devices directly affects their performance, but it is difficult to apply conventional cooling methods such as the use of cooling liquids or fans to micro devices owing to the small size of micro devices
The produced p-Cu/G/rGO composite formed a porous structure, a single layer graphene was formed on the copper surface, and it was confirmed that reduced graphene oxide exists between the porous structures
The p-Cu/G/rGO was confirmed to have a good heat dissipation capability owing to its wide surface area and the presence of graphene, which was in agreement with the results of the simulation
Summary
Thermal management in devices directly affects their performance, but it is difficult to apply conventional cooling methods such as the use of cooling liquids or fans to micro devices owing to the small size of micro devices. We attempted to solve this problem by employing a heat sink fabricated using copper with porous structures consisting of single-layer graphene on the surface and graphene oxide inside the pores. One of the properties required for effective thermal management with heat sink in electronic devices is heat dissipation properties. Structures comprising a wide surface area, such as porous structures, are advantageous, and the use of materials having a high radiation rate is one solution to the aforementioned problem. Another well-known requirement of heat sinks is their high thermal conductivity[19,20,21]. Composite was fabricated into a heat sink that was used to mount the light emitting diode (LED), and the thermal management characteristics of the composite were analyzed
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