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Double-pulse flash Raman method and system for characterizing thermal properties of two-dimensional nanomaterials

A two-dimensional nanomaterial, double-pulse technology, applied in the direction of thermal conductivity of materials, thermal development of materials, analysis of materials, etc. question

Active Publication Date: 2021-05-11
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to change the spot size by adjusting the distance between the focal plane and the sample, which will introduce certain errors in the measurement; Measurement error; the heating laser is used as the probe light at the same time. If the heating power is too high, it will cause thermal drift of the laser. If the heating power is too small, the temperature rise of the sample will be too small, which will affect the measurement accuracy.
[0005] In summary, the existing experimental research is still unable to accurately measure the thermal conductivity of two-dimensional nanomaterials with a substrate, and it is urgent to develop a simpler and more accurate method for determining the thermal conductivity of two-dimensional nanomaterials with a substrate

Method used

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  • Double-pulse flash Raman method and system for characterizing thermal properties of two-dimensional nanomaterials
  • Double-pulse flash Raman method and system for characterizing thermal properties of two-dimensional nanomaterials
  • Double-pulse flash Raman method and system for characterizing thermal properties of two-dimensional nanomaterials

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Embodiment 1

[0184] In this embodiment, the thermophysical parameters of the two-dimensional nanomaterials are determined.

[0185] The physical model of two-dimensional nanomaterials with substrates such as Figure 7 shown. In a vacuum environment, use a Gaussian distribution beam with a spot radius of r h The continuous heating laser heats the two-dimensional nanomaterial sample and the substrate. Since the heating laser conforms to the Gaussian distribution and the center is symmetrical, the sample conforms to the one-dimensional cylindrical coordinate heat conduction equation, and the substrate conforms to the two-dimensional cylindrical coordinate heat conduction equation. When the steady state is reached, the power used is less than 3mW and the spot radius is r p The continuous detection laser measures the Raman spectrum of the sample and the substrate, and the steady-state Gaussian average temperature rise of the sample and the substrate surface can be determined by the shift of t...

Embodiment 2

[0200] In this embodiment, the thermal physical parameters of the two-dimensional nanomaterials are determined according to the same method and steps as those in Embodiment 1. The difference is that for the two-dimensional nanomaterials set on the suspension, the unsteady-state heat conduction equations of the sample during the cooling stage are formulas (9-12):

[0201]

[0202]

[0203] θ s (∞,t)=0 (11)

[0204] θ s (r,0)=θ s0 (r) (12)

[0205] In this embodiment, the equation is dimensionless, and it can be known by derivation that the variation curve of the Gaussian average temperature rise of the dimensionless sample with time Only with the sample thermal diffusivity α s Related, the thermal diffusivity α s the impact of Figure 15 shown.

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Abstract

The invention proposes a double-pulse flash Raman method and system for characterizing the thermophysical properties of two-dimensional nanomaterials. The dual-pulse flash Raman method for characterizing the thermal properties of two-dimensional nanomaterials includes: (1) obtaining the temperature rise data of the sample through heating pulse laser and detection pulse laser with different wavelengths and the same pulse period; (2) based on the temperature rise data , to determine the thermophysical parameters of the sample. In the method proposed by the present invention, the heating pulse laser is used to heat the sample and the detection pulse laser is used to detect the sample at different time periods. In this way, the method does not need to focus and avoids measurement errors, and the heating pulse laser and the detection pulse laser can avoid heating power. The impact on the measurement accuracy, so that the accuracy and sensitivity of the thermal physical parameters of the sample characterized by this method are better.

Description

technical field [0001] The present invention relates to the field of micro-nano-scale thermophysical property testing. Specifically, the present invention relates to a double-pulse flash Raman method and system for characterizing the thermophysical properties of two-dimensional nanomaterials. More specifically, the present invention relates to a dual-pulse flash Raman method for characterizing thermal properties of two-dimensional nanomaterials, and a dual-pulse flash Raman system for characterizing thermal physical properties of two-dimensional nanomaterials. Background technique [0002] Nano-thin film materials have important application prospects in the fields of optoelectronic components, mechanical components and storage media, and the accurate determination of the properties of nano-thin film materials is a prerequisite for its application. [0003] The contact method, as a traditional measurement method for thermal conductivity properties, is widely used in the measu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20G01N21/65
CPCG01N21/65G01N25/20G01N25/18G01N21/1717G01N2021/1725G01N2021/1731G01N2201/067G01K11/125
Inventor 张兴樊傲然胡玉东马维刚
Owner TSINGHUA UNIV
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