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Thermophysical Properties Measurements of High Thermal Conductive Organic Hybrid Materials by Sinusoidal Heating Thermoreflectance Technique
Keywords: Thermophysical properties, Organic hybrid material, Thermoreflectance
There is an increasing need for the high thermal conductive materials in the field of consumer electronics, communication devices and automotive equipments. Historically metal and metal compounds have provided thermal paths as heat spreader. However, the high electrical conductivity limits its application in most of the devices because it requires an electrical insulator or gap to isolate it from the heat sources. Recently, the hybrid organic materials with high thermal conductivity and high electrical resistivity get attention as heat spreader. To develop hybrid organic materials with thermal conductivity of above 40 Wm-1K-1 a research project has been initiated in Japan. Filler materials with very high thermal conductivity like BN is now using in epoxy matrix to achieve the goal. However, to find the mechanism of such high thermal conduction of hybrid polymers, a complete thermal characterization, especially, the thermophysical properties of local areas throughout the hybrid matrix is indispensable in terms of synthesis condition as well wide variety of filler geometry, orientation and dispersion. To conduct such thermal characterization, an experimental set up based on sinusoidal heating thermoreflectance has been used. In this technique, the modulated pump beam is focused on the metal coated specimen as heat source and the temperature response is determined by another laser as probe laser focused by a microscopic lens in an area of several micrometers. As a result, thermophysical properties in a point area throughout the specimen can be measured. To protect the damage of the organic specimen form the laser heating, the power density is optimized to be several mW at a beam spot having beam diameter 70 Em. The highly-sensitive experimental setup is capable of measuring the thermoreflectance signal at less than 1 mW of probe power. The thermophysical properties of samples are derived from the phase lag of temperature response from the sinusoidal heating. To decide the thermophysical properties of the unknown materials, a calibration curve of phase lag as a function of thermal effusivity has been made from materials with known thermophysical properties. Materials from low thermal conductivity such as Pyrex to very high conductivity such as Mo metal including organic materials have been used for the above purpose.
S. H. Firoz, Researcher
National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology, AIST
Tsukuba, Ibaraki 305-8563,
Japan


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