Terahertz wave band integrating sphere based on MXene two-dimensional material and preparation method thereof

Abstract

The invention belongs to the field of optical measurement, provides a Terahertz band integrating sphere based on an MXene two-dimensional material and a preparation method thereof, and aims to solve the problems of low reflectivity, poor uniformity, insufficient stability and the like in a Terahertz band of an existing integrating sphere. A diffuse reflection microstructure is arranged on the inner surface of an integrating sphere, the diffuse reflection microstructure is composed of a plurality of hemispherical structure units which are uniformly distributed, and any adjacent hemispherical structure units are adjacently arranged; meanwhile, a reflecting layer is arranged on the inner surface of the integrating sphere, the reflecting layer uniformly covers the surface of the diffuse reflection microstructure, and the reflecting layer is made of an MXene material. According to the terahertz wave band integrating sphere, the reflecting layer is formed on the inner surface of the integrating sphere by utilizing the high reflectivity characteristic and excellent stability of the MXene material in the terahertz wave band, and the reflecting layer and the regular rough surface formed by the diffuse reflection microstructure work cooperatively to form diffuse reflection on the terahertz wave, so that the terahertz wave band integrating sphere is obtained; wide application prospects are realized in the fields of terahertz communication, imaging, sensing and the like.

Description

Technical Field

[0001] The present invention belongs to the field of optical measurement, relates to an integrating sphere in the terahertz band, and specifically provides a terahertz-band integrating sphere based on MXene two-dimensional material and a preparation method thereof. Background Art

[0002] An integrating sphere is a device used for optical measurement and is widely applied in fields such as light intensity measurement and spectral analysis. The integrating sphere in the terahertz band has important application prospects in fields such as communication, imaging, and sensing. However, traditional integrating spheres are mainly applied in the visible light and near-infrared bands, and the research on integrating spheres in the terahertz band is relatively less. Moreover, the existing integrating spheres have deficiencies in aspects such as reflectivity, uniformity, and stability in the terahertz band, and there is an urgent need for a new type of integrating sphere to solve these problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a terahertz-band integrating sphere based on MXene two-dimensional material and a preparation method thereof, so as to solve the problems of low reflectivity, poor uniformity, and insufficient stability of the existing integrating spheres in the terahertz band.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A terahertz-band integrating sphere based on MXene two-dimensional material, characterized in that a pair of ports are opened at 90° along the central axis of the integrating sphere, serving as an incident port and an exit port respectively; an artificially designed diffuse reflection microstructure is arranged on the inner surface of the integrating sphere, and the diffuse reflection microstructure is composed of a plurality of uniformly distributed hemispherical structural units, and any adjacent hemispherical structural units are adjacently arranged; at the same time, a reflective layer is arranged on the inner surface of the integrating sphere, the reflective layer uniformly covers the surface of the diffuse reflection microstructure, and the reflective layer is made of MXene material.

[0006] Further, the radius of the integrating sphere is 20 mm to 80 mm.

[0007] Further, the opening ratio of the integrating sphere is 10% to 14%.

[0008] Further, the radius of the hemispherical structural unit is 0.5 mm to 2 mm.

[0009] Further, the thickness of the reflective layer is 2 μm to 15 μm.

[0010] Further, the MXene material is specifically Ti3C2.

[0011] Further, the ports of the integrating sphere are designed for focused light incidence.

[0012] Further, the terahertz band integrating sphere based on MXene two-dimensional material is prepared by the following steps:

[0013] Step 1. Prepare MXene material by chemical exfoliation method and disperse it to obtain Mxene suspension;

[0014] Perform selective etching on Ti3AlC2 powder in a mixed solution of hydrofluoric acid and hydrochloric acid, then exfoliate it after LiCl intercalation to obtain Mxene single-layer nanosheets, and finally disperse the Mxene single-layer nanosheets in deionized water to form a uniform Mxene suspension;

[0015] Step 2. Use stereolithography (SLA) technology to print the outer shell of the integrating sphere, and form the integrating sphere and the diffuse reflection microstructure on its inner surface;

[0016] Step 3. Spray the Mxene suspension on the inner surface of the integrating sphere by spraying process to form a uniform reflective layer.

[0017] Based on the above technical solutions, the beneficial effects of the present invention are as follows:

[0018] The present invention provides a terahertz band integrating sphere based on MXene two-dimensional material and its preparation method. Utilizing the high reflectivity characteristics and excellent stability of MXene material in the terahertz band, a reflective layer is formed on the inner surface of the integrating sphere, which works in cooperation with the regular rough surface formed by the diffuse reflection microstructure to form diffuse reflection of terahertz waves, effectively solving the problems of low reflectivity, poor uniformity, and insufficient stability of existing integrating spheres in the terahertz band. It can accurately provide the transmittance, absorbance, and reflectivity of surface rough samples, and has broad application prospects in the fields of terahertz communication, imaging, and sensing. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the four-part structure of the terahertz band integrating sphere based on MXene two-dimensional material in the present invention.

[0020] Figure 2 It is a schematic diagram of the physical object of the terahertz band integrating sphere based on MXene two-dimensional material in the present invention.

[0021] Figure 3 It is the electric field distribution diagram of the microstructure diffuse reflection surface in the present invention.

[0022] Figure 4 It is the comparison result diagram of the integrating sphere test and THz-TDS test reflectivity of the gold-plated thin film sample in the embodiment of the present invention. Detailed Embodiments

[0023] To make the objectives, technical solutions, and beneficial effects of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] This embodiment provides a terahertz band integrating sphere based on MXene two-dimensional material, and its structure is as Figure 1 shown. A pair of ports are opened at 90° along the central axis of the integrating sphere (that is, the radii where the two ports are located form a 90° angle), which are used as the incident port and the exit port respectively; an artificially designed diffuse reflection microstructure is arranged on the inner surface of the integrating sphere, and the diffuse reflection microstructure is composed of a plurality of uniformly distributed hemispherical structure units, and any adjacent hemispherical structure units are adjacently arranged; at the same time, a reflective layer is arranged on the inner surface of the integrating sphere, and the reflective layer uniformly covers the surface of the diffuse reflection microstructure, and the reflective layer uses MXene material.

[0025] Furthermore, the radius of the integrating sphere is 20 mm to 80 mm, and this embodiment preferably uses 40 mm.

[0026] Furthermore, the opening ratio of the integrating sphere is 10% to 14%, and this embodiment preferably uses 12.5% to achieve the best electric field distribution and energy uniformity. The opening ratio refers to the ratio of the total port spherical area to the inner surface area of the integrating sphere.

[0027] Furthermore, the radius of the hemispherical structure unit is 0.5 mm to 2 mm, and this embodiment preferably uses 1 mm.

[0028] Furthermore, the thickness of the reflective layer is 2 μm to 15 μm, and this embodiment preferably uses 10 μm.

[0029] Furthermore, the MXene material is specifically Ti3C2.

[0030] Furthermore, the ports of the integrating sphere are designed for focused light incidence to prevent input quantity loss.

[0031] Furthermore, the terahertz band integrating sphere based on MXene two-dimensional material is prepared by the following steps:

[0032] Step 1. Prepare MXene material by chemical exfoliation method and disperse to obtain Mxene suspension;

[0033] Perform selective etching on Ti3AlC2 powder in a mixed solution of hydrofluoric acid and hydrochloric acid, then exfoliate through LiCl intercalation to obtain Mxene single-layer nanosheets, and finally disperse the Mxene single-layer nanosheets in deionized water to form a uniform Mxene suspension;

[0034] Step 2. Print the shell of the integrating sphere using stereolithography (SLA) technology to form the integrating sphere and the diffuse reflection microstructure on its inner surface; the SLA printing technology can ensure the structural accuracy and surface smoothness of the integrating sphere.

[0035] Step 3. Spray the Mxene suspension on the inner surface of the integrating sphere using a spraying process to form a uniform reflective layer.

[0036] Next, the measurement effectiveness of the integrating sphere provided by the present invention is verified by testing multiple gold-plated film samples, and the output value of the integrating sphere is tested using a 97 GHz source and an oscilloscope. As Figure 2 shown is a physical schematic diagram of the terahertz-band integrating sphere based on MXene two-dimensional material in this embodiment. As Figure 3 shown is the distribution diagram of the surface electric field of the microstructure diffuse reflection in this embodiment. As Figure 4 is the comparison result diagram of the integrating sphere test and the THz-TDS test reflectivity of the gold-plated film sample in this embodiment. It can be seen from the figure that the absorption rate of the gold-plated film sample based on the integrating sphere of the present invention is consistent with the TDS test result, demonstrating the effectiveness of the present invention.

[0037] The above is only the specific implementation manner of the present invention. Any feature disclosed in this specification, unless specifically described, can be replaced by other equivalent or similar-purpose alternative features; all the features disclosed, or all the steps in any method or process, except for mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A terahertz band integrating sphere based on MXene two-dimensional material, characterized in that, The integrating sphere has a pair of ports opened at 90° along the central axis, serving as the incident port and the exit port respectively; the inner surface of the integrating sphere is provided with an artificially designed diffuse reflection microstructure, which is composed of a number of uniformly distributed hemispherical structural units, and any adjacent hemispherical structural units are adjacently arranged; at the same time, a reflective layer is provided on the inner surface of the integrating sphere, the reflective layer uniformly covers the surface of the diffuse reflection microstructure, and the reflective layer is made of MXene material.

2. The integrating sphere in the terahertz band based on the MXene two-dimensional material according to claim 1, wherein The radius of the integrating sphere is from 20 mm to 80 mm.

3. The integrating sphere in the terahertz band based on MXene two-dimensional material according to claim 1, characterized in that, The opening ratio of the integrating sphere is 10% - 14%.

4. The integrating sphere in the terahertz band based on MXene two-dimensional material according to claim 1, characterized in that, The radius of the hemispherical structural unit is from 0.5 mm to 2 mm.

5. The integrating sphere in the terahertz band based on MXene two-dimensional material according to claim 1, wherein The thickness of the reflective layer is from 2 μm to 15 μm.

6. The integrating sphere in the terahertz band based on MXene two-dimensional materials according to claim 1, characterized in that, The MXene material is specifically Ti3C2.

7. The integrating sphere in the terahertz band based on MXene two-dimensional material according to claim 1, characterized in that The ports of the integrating sphere are designed for focused light incidence.

8. The preparation method of the terahertz band integrating sphere based on MXene two-dimensional material according to claim 1, wherein, It includes the following steps: Step 1. Prepare the MXene material by chemical exfoliation method and disperse it to obtain a Mxene suspension; Step 2. Use stereolithography (SLA) technology to print the outer shell of the integrating sphere, and form the integrating sphere and the diffuse reflection microstructure on its inner surface; Step 3. Use the spraying process to spray the Mxene suspension on the inner surface of the integrating sphere to form a uniform reflective layer.

9. The preparation method of the terahertz band integrating sphere based on MXene two-dimensional material according to claim 8, wherein, The specific process of Step 1 is: Selectively etch the Ti3AlC2 powder in a mixed solution of hydrofluoric acid and hydrochloric acid, then intercalate with LiCl and exfoliate to obtain Mxene single-layer nanosheets, and finally disperse the Mxene single-layer nanosheets in deionized water to form a uniform Mxene suspension.

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