Thermal diffusivity measurement method for two-dimensional anisotropy nanometer material

Abstract

The invention discloses a thermal diffusivity measurement method for a two-dimensional anisotropy nanometer material. The method comprises the following steps that: using continuous heating laser to heat the surface of a sample, using continuous detection laser of which the light spot center position is adjustable to detect the steady state plane temperature distribution of the surface of the sample, and obtaining two characteristic directions of the thermal diffusivity of the sample; using heating pulse laser to heat the surface temperature of the sample, enabling the temperature to periodically change, and using detection pulse laser of which the light spot center position is adjustable to obtain the temperature rise and reduction curves of different position points in two characteristicdirections; and according to the temperature rise and reduction curves of different position points, establishing a non-steady-state heat conduction equation set to fit, or utilizing a phase lock principle to carry out data processing to obtain the thermal diffusivity of the sample. The method is a non-contact nondestructive measurement method, the thermal diffusivities of two characteristic directions can be simultaneously obtained, and the direct measurement of the thermal diffusivities of nonmetal two-dimensional anisotropy nanometer materials of which the thickness is from a single atom to hundreds of nm is realized.

Description

technical field [0001] The invention relates to the technical field of micro-nano-scale thermal physical property testing, in particular to a method for measuring thermal diffusivity of two-dimensional anisotropic nanomaterials. Background technique [0002] Anisotropic nano-film materials have important application prospects in various aspects such as optics, lattice vibration, electronics and electrical transport, heat and mechanics, and the accurate determination of the properties of anisotropic nano-film materials is prerequisites for its application. [0003] Traditional thermal diffusivity measurement methods are mainly used to measure isotropic materials. As a new type of material, anisotropic nanomaterials have little experimental data on their thermal properties. Taking the typical two-dimensional anisotropic nanomaterial black phosphorus as an example, the experimental results of its thermal diffusivity were not reported by scholars for the first time until 2015. ...

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Problems solved by technology

[0006] In summary, the existing experimental measurement methods cannot accurately measure the thermal diffusivity of two-dimensional anisotropic nanomaterials, especially for the direct measurement of the thermal diffusivity of non-metallic two-dimensional anisotropic nanomaterials with a thickness of <100nm. There is still a gap in the world. Therefore, it is urgent to develop a more convenient, higher-precision, and more widely used direct non-destructive measurement method for the thermal diffusivity of two-dimensional anisotropic nanomaterials.

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