Simultaneous measurement of laser absorptivity and thermal conductivity of a single micro-nano wire

Abstract

The invention provides a method for simultaneously measuring the laser absorptivity and thermal conductivity of a single micro-nano wire, and belongs to the technical field of physical property characterization of nano-materials. The main feature is to use non-contact laser Raman measurement technology to locate and calibrate the temperature of a single micro-nano wire, and then use laser heating and electric heating methods to achieve equal center temperatures of the samples to be tested in a vacuum environment and measure their respective heating power. The laser absorptivity and thermal conductivity of the sample to be tested can be obtained simultaneously by substituting the geometric size, central temperature and heating power of the micro-nano wire into the theoretical formula for calculation. This method has a wide range of applications, simple principle, and convenient operation. It is suitable for micro-nano wires of various materials, diameters, and lengths with characteristic Raman spectra. It fills the technical gap in measuring the laser absorption rate of a single carbon nanotube, and is practical. Engineering applications provide valuable basic physical property data.

Description

technical field [0001] The invention relates to the technical field of thermal characteristic testing of micro-nano wires, in particular to a method for simultaneously measuring the laser absorptivity and thermal conductivity of a single micro-nano wire. Background technique [0002] Micro-nano wires include carbon fibers, silicon / germanium nanowires, carbon nanotubes, etc., and have a wide range of engineering application backgrounds in the heat dissipation of microelectronic devices, the development of new thermoelectric materials, and aerospace engineering. Among them, carbon nanotubes are known as the most promising nanomaterials in the 21st century. In 1991, Professor Iijima of the Basic Research Laboratory of NEC Corporation in Japan discovered carbon nanotubes for the first time. It is formed by curling a single layer (or several layers) of carbon atoms. A one-dimensional material with extremely high mechanical strength, thermal conductivity and excellent field emissi...

AI Technical Summary

Problems solved by technology

However, this method uses a microelectrode as a temperature sensor (characteristic length ~10 μm) and can only measure the endpoint temperature of the micro-nano wire, and cannot obtain the temperature distribution along the length direction of the micro-nano wire; in addition, there will inevitably be contact between the micro-electrode and the sample to be tested Resistance and thermal contact resistance, adding to the uncertainty of temperature measurement

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