Method for simultaneously measuring laser absorptivity and thermal conductivity of single micro-nano wire rod

Abstract

The invention provides a method for simultaneously measuring the laser absorptivity and thermal conductivity of a single micro-nano wire rod, belonging to the technical field of characterization of property of nano-materials. The method disclosed herein is characterized by using contactless laser Raman measurement technology to position and carry out temperature calibration on the single micro-nano wire rod; then respectively using laser heating and electric heating methods in a vacuum environment to reach equal core temperature of samples to be measured and measure respective heating power; substituting the geometry size, core temperature and heating power of the micro-nano wire rod in a theoretical formula to simultaneously calculate the laser absorptivity and thermal conductivity of the samples to be measured. According to the invention, the method has the advantages of wide range of application, simple principle and convenient operation, is suitable for various micro-nano wire rods which have characteristic Raman spectrum and have different materials, diameters and lengths, fills the technical gap of measuring the laser absorptivity of the single micro-nano wire rod, and provides valuable basic physical property data for practical engineering application.

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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