Preparation method of test paper type sample cell for liquid terahertz spectrum detection

Abstract

A preparation method of a test paper type sample cell for liquid terahertz spectrum detection comprises the following steps: step 1, carrying out surface microstructuring treatment on a substrate, generating a micron structure on the surface of the substrate, and carrying out chemical modification, natural airing or low-temperature thermal separation blow-drying on the substrate with the micron structure, so as to form a super-hydrophobic region and a region which is not soaked by a solution; the non-modified area has no super-hydrophobicity; step 2, setting an area for adsorbing liquid to be detected in the super-hydrophobic area, ablating to remove a chemical modification layer on the surface of the microstructure on the area by using a laser precision selective scanning method, and changing the area into a super-hydrophilic area to form a super-hydrophobic-super-hydrophilic patterned mixed surface, the test paper type sample cell is a test paper type sample cell with a super-hydrophilic surface and a super-hydrophobic-super-hydrophilic patterned mixed surface. The device is low in manufacturing cost and can be used as a disposable consumable; cleaning is not needed, and replacement can be carried out immediately after use; the operation is simple; and the signal loss is low.

Description

Technical Field

[0001] The invention belongs to the technical field of terahertz spectrum detection, and in particular relates to a method for preparing a test paper type sample pool for liquid terahertz spectrum detection. Background Art

[0002] Terahertz (THz) waves occupy a very special position in the electromagnetic spectrum. They refer to waves with a frequency between 0.1 and 10 THz (1 THz = 10 12 Hz) range of electromagnetic waves. Its long-wave band is connected to microwaves, and its short-wave band is connected to infrared rays. Due to its special position in the electromagnetic spectrum, terahertz waves have some unique properties that infrared and microwaves cannot have at the same time. For example, low energy: refers to the low energy of single photons, and there is no ionization damage to biological tissues; high penetration: terahertz waves have strong penetration ability for most non-polar substances, such as paper, plastic, etc. Fingerprint spectrum: terahertz sources can emit wide-spectrum signals ranging from GHz to tens of THz, and obtain fingerprint spectra after interacting with many substances, which can realize the inspection and identification of substances. In particular, the molecular motion frequencies of many biological macromolecules such as rotation and vibration are also in this range, so terahertz spectroscopy is also very suitable for the detection and dynamics research of biological molecules and organic matter. However, water, as a polar molecule, strongly absorbs terahertz waves. When detecting substances containing water or dissolved in water, it is often difficult to achieve effective detection due to too strong absorption. However, water is a necessary condition for most biological molecules to remain active. They lose their activity after dehydration, so the dehydration method is not suitable in some occasions. In addition, the spectral characteristics of polar liquids such as water have also attracted widespread attention. Therefore, it has been unremittingly pursued to propose a new method that can effectively detect polar liquids and solutions containing polar substances.

[0003] At present, people have developed a variety of schemes to achieve the detection of water-containing substances, but there are still some shortcomings, such as: the non-polar solution method, which is to place the water-containing substance in a non-polar solution with very low terahertz wave absorption, thereby eliminating the influence of strong absorption of the solvent.

[0004] However, substances originally in aqueous solution often undergo changes in the laws of molecular motion when placed in a non-polar solution, and some solvents are toxic to biological molecules, so this method is not suitable for most substances.

[0005] In addition, people have also proposed the metasurface method, which is to construct a special electromagnetic microstructure to generate local terahertz wave enhancement through resonance and other methods, thereby enhancing the interaction between the electromagnetic wave and the detection substance to improve the detection signal. However, the metasurface method can often only achieve one or several frequency points, rather than the enhancement of a wide spectrum. Therefore, a metasurface can usually only detect one substance, and often can only detect the presence of the substance, but cannot detect its spectral distribution characteristics.

[0006] In addition, people have also proposed the attenuated total reflection method, which uses a prism made of a material with a high refractive index, such as high-resistance silicon. Then the terahertz wave passing through the prism is totally reflected on one of the planes, and the evanescent wave that passes through the interface during total reflection enters the aqueous solution for detection. Due to the shallow penetration depth, excessive absorption of the signal can be avoided. However, the detection depth of this method is too shallow and cannot be adjusted, making it difficult to detect dilute solutions.

[0007] In addition, the cavity-type sample pool method is a more commonly used method. It constructs a tiny cavity as a liquid sample pool. The front and rear ends of the cavity are equipped with windows made of terahertz wave high transmittance materials, and a cavity is left in the middle to fill the liquid. The depth of the sample pool cavity can be adjusted by gaskets of different thicknesses, so the depth of the solution can be adjusted to produce a suitable transmission signal intensity to achieve detection. This method can also meet the detection needs of different solutions. However, the solution pool needs to be strictly cleaned after changing the liquid, the operation is more troublesome, and its preparation cost is high, which is not conducive to large-scale promotion and use. Summary of the invention

[0008] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a method for preparing a test paper type sample pool for liquid terahertz spectroscopy detection, which has low production cost and the obtained test paper type sample pool can be used as a disposable consumable; it does not require cleaning and can be replaced immediately after use; it is simple to operate and has low signal loss.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is:

[0010] A method for preparing a test paper type sample cell for liquid terahertz spectrum detection comprises the following steps:

[0011] Step 1, select a paper sheet as a substrate 1, perform surface microstructuring treatment on a part of the substrate 1, generate a micron structure on the surface of the substrate 1, chemically modify the substrate 1 with the generated micron structure, uniformly adhere stearic acid to the microstructure of the substrate 1, build a layer of hydrophobic base molecules, then take it out, dry it naturally or blow it with low-temperature heat, and after drying, form a surface with super-hydrophobic properties, that is, a super-hydrophobic area 4, and the untreated area is still an ordinary surface, that is, an unmodified area 5, which does not have super-hydrophobicity, and this part is used as a handheld terminal;

[0012] Step 2, setting an area for adsorbing the liquid to be tested in the super-hydrophobic area 4, using the laser precision selected area scanning method, scanning line by line through the laser spot, ablating and removing the hydrophobic base molecular layer on the microstructure surface of the area, and converting the area into a super-hydrophilic area 7, but without destroying the paper-based material, forming a super-hydrophobic-super-hydrophilic patterned mixed surface 8, that is, a test paper type sample pool 9 with a super-hydrophilic surface and a super-hydrophobic-super-hydrophilic patterned mixed surface.

[0013] In the step 1, the substrate 1 is an ordinary paper sheet with a thickness of 0.1-5 mm.

[0014] In the step 1, the surface is microstructured by sandpaper polishing to generate a microstructure with a scale of 10 μm-1 mm on the surface of the substrate 1 .

[0015] In the step 1, the specific method of chemical modification is to immerse in a stearic acid alcohol solution 2 with a concentration of 0.01-0.5 mol / L for 30 minutes, and the components of the hydrophobic base molecular layer are methyl (-CH3) and ethyl (-CH2).

[0016] To make the substrate (1) have a surface with super-hydrophobic properties, one of the following methods can be used: vapor deposition, spin coating, spray coating, imprinting or magnetron sputtering.

[0017] The substrate (1) may also be chemically modified using a chemical material such as fluorosilane or carbon tetrafluoride;

[0018] The laser precision selective scanning is replaced by a method using mechanical friction or precision heating removal.

[0019] The super hydrophobic-super hydrophilic patterned hybrid surface is circular, elliptical, triangular, square, rectangular or pentagonal.

[0020] In the step 2, the laser precision selected area scanning is specifically as follows:

[0021] The laser spot controlled by the galvanometer is scanned line by line, and the position accuracy during scanning is less than 5 microns, ensuring the selection accuracy of the scanning area; the spot overlap rate during scanning is not less than 20%, ensuring that all areas in the selected area are fully irradiated.

[0022] The method for using a test paper type sample cell for liquid terahertz spectrum detection comprises the following steps:

[0023] Step 1: Adsorb the liquid 10 to be tested, by dipping the test paper sample pool 9 into the solution directly, or using a pipette to accurately absorb a certain volume of the liquid to be tested, and drop it on the super-hydrophilic area 7 of the test paper sample pool 9, the liquid automatically spreads and adheres to the super-hydrophilic area 7, and does not wet the super-hydrophobic area 8. After absorbing the liquid to be tested, the test paper sample pool 9 can be placed horizontally or vertically, and the liquid can adhere firmly;

[0024] Step 2: Install the test paper type sample pool 9 for spectrum detection, fix the test paper type sample pool 9 adsorbing the liquid to be tested at the detection position of the terahertz spectrum detection device, and perform terahertz spectrum detection.

[0025] The test paper type sample pool 9 is fixed vertically or horizontally in the test light path 13 during testing.

[0026] Beneficial effects of the present invention:

[0027] 1. The test paper sample pool is easy to use. When taking a large amount of solution, you only need to dip the test paper into the solution and take it. There is no need to set the solution inlet and outlet like the container-type sample pool. When a small amount of liquid needs to be adsorbed, you only need to use a precision pipette to drop a certain volume of solution into the super-hydrophilic area, and the solution will automatically spread into a water film in the area. When fixed, it can be directly fixed on the test stand of the solid sample without replacing the test stand and other accessories.

[0028] 2. The test paper sample pool has high solution volume control accuracy. When detecting a very thin aqueous solution, the sample pool can precisely control the thickness of the aqueous solution to tens to hundreds of microns. Due to the strong hydrophilicity of the super-hydrophilic area to the aqueous solution, a very small amount of liquid dropped into the area can also automatically spread to the entire hydrophilic area, thus forming a liquid film with a thickness of tens of microns, realizing the precise detection of trace amounts of liquid to be tested.

[0029] 3. The signal loss of the test paper type sample pool is low. Since the substrate is made of terahertz high transmittance materials such as paper and is used in the shape of a thin sheet, it does not require a window piece compared to a container type sample pool, and its signal loss is low.

[0030] 4. The production cost of the test paper type sample pool is extremely low, and it can be further made into a disposable test paper. Since the production process of super-hydrophobic and super-hydrophilic surfaces is relatively simple, and the substrate uses paper sheets, etc., the cost is extremely low and the production is simple and quick. It can be further mass-produced into standardized disposable sample pools, which can greatly reduce the threshold for use and promote related research on liquid terahertz spectroscopy detection. In addition, due to the extremely low production cost, a new sample pool can be directly replaced when testing different solutions, which can eliminate the laborious cleaning process and do not have to worry about measurement interference caused by residual solutions that are not thoroughly cleaned. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The invention relates to a method for preparing a test paper type sample pool based on a super-hydrophobic-super-hydrophilic surface.

[0032] Figure 2 The invention discloses a method for using a test paper type sample pool based on a super-hydrophobic-super-hydrophilic surface.

[0033] Figure 3 Schematic diagram of the sample pool holding liquid at different angles and thicknesses.

[0034] Figure 4 This is an example of detecting the terahertz absorption spectrum of water in the sample cell. Description of the drawings:

[0036] Figure 1 Middle: 1-paper; 2-stearic acid alcohol solution; 3-paper after surface chemical treatment; 4-superhydrophobic area; 5-unmodified area; 6-laser scanning system; 7-superhydrophilic area; 8-superhydrophobic area; 9-test paper type sample pool based on superhydrophobic-superhydrophilic patterned hybrid surface.

[0037] Figure 2 Middle: 10-liquid to be tested (water); 11-test paper type sample pool containing the liquid to be tested; 12-sample pool fixing bracket; 13-detection light path. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] like Figure 1 As shown, a method for preparing a test paper type sample cell for liquid terahertz spectroscopy detection comprises the following steps;

[0040] Step 1, select a paper sheet as a substrate 1, perform surface microstructuring treatment on the substrate 1, generate a micron structure on the surface of the substrate 1, chemically modify the substrate 1 with the generated micron structure, uniformly adhere stearic acid to the microstructure of the substrate 1, build a layer of hydrophobic base molecules of methyl (-CH3) and ethyl (-CH2), then take it out, dry it naturally or blow it dry with low temperature heat, so as to form a surface with super hydrophobic performance, that is, super hydrophobic area 4, while the area not soaked in the solution is still an ordinary surface, that is, an unmodified area 5, which does not have super hydrophobicity, and this part of the paper sheet can be used as a handheld terminal;

[0041] In step 1, the substrate 1 is a common paper sheet with a thickness of 0.2-5 mm, such as printing paper, writing paper, etc. made from plant fibers such as wood and grass through pulping and papermaking processes.

[0042] In the step 1, a surface microstructuring treatment is performed by sandpaper polishing or the like, so as to generate a micron structure with a scale between 10 μm and 1 mm on the surface of the substrate 1 .

[0043] In the step 1, the specific method of chemical modification is to immerse the substrate 1 in a stearic acid alcohol solution 2 with a concentration of 0.01-0.5 mol / L for about 30 minutes. The super-hydrophobic property of the substrate 1 can also be prepared by vapor deposition, spin coating, spraying, imprinting, magnetron sputtering, etc. to prepare a super-hydrophobic surface.

[0044] The chemical modification material of the substrate 1 may also be fluorosilane, carbon tetrafluoride and other chemical materials.

[0045] Step 2, setting an area for adsorbing the liquid to be tested in the super-hydrophobic area 4, using the laser precision selected area scanning method, by scanning the laser spot line by line, ablating and removing a layer of chemical modification layer on the microstructure surface of the area, thereby converting the area into a super-hydrophilic area 7, forming a test paper type sample pool with a super-hydrophobic-super-hydrophilic patterned mixed surface, that is, a super-hydrophilic surface with a super-hydrophobic-super-hydrophilic patterned mixed surface.

[0046] In the step 2, the laser precision selected area scanning is specifically as follows:

[0047] The laser spot controlled by the galvanometer is scanned line by line, and the position accuracy during scanning is less than 5 microns, ensuring the selection accuracy of the scanning area; the spot overlap rate during scanning is not less than 20%, ensuring that all areas in the selected area are fully irradiated.

[0048] Here, please note that a lower power should be used during laser scanning to prevent the thin film from being over-ablated. Only a slight ablation is needed to remove a layer of stearic acid modification on the surface. After this step, a test paper sample pool with a super-hydrophobic surface and a super-hydrophilic surface in the middle with a super-hydrophobic-super-hydrophilic patterned mixed surface is completed. The sample pool is a flat plate type, and the different adhesion forces of the super-hydrophobic and super-hydrophilic surfaces to polar liquids such as water are used to adsorb and control the liquid to be tested without the need to construct a containing cavity. It is a very convenient test paper sample pool for liquid terahertz spectroscopy detection.

[0049] The laser precision selective scanning can also be replaced by using mechanical friction removal or precision heating removal.

[0050] The super-hydrophobic-super-hydrophilic patterned hybrid surface is a polygon such as a circle, an ellipse, a triangle, a square, a rectangle, a pentagon, or other complex shapes.

[0051] The method for using a test paper type sample cell for liquid terahertz spectrum detection comprises the following steps:

[0052] Step 1: Adsorb the liquid 10 to be tested, by dipping the test paper sample pool 9 into the solution directly, or using a pipette to accurately absorb a certain volume of the liquid to be tested, and drop it on the super-hydrophilic area 7 of the test paper sample pool 9, the liquid automatically spreads and adheres to the super-hydrophilic area 7, and does not wet the super-hydrophobic area 8. After the test paper sample pool 9 adsorbs the liquid to be tested, the liquid can be firmly adhered when it is placed horizontally or vertically;

[0053] Step 2: Install the test paper type sample pool 9 for spectrum detection, fix the test paper type sample pool 9 adsorbing the liquid to be tested at the detection position of the terahertz spectrum detection device to realize terahertz spectrum detection.

[0054] The test paper type sample pool 9 is fixed vertically or horizontally in the test light path during testing.

[0055] The sample pool is very convenient to fix during testing, and can be fixed vertically or horizontally in the test light path like a solid sheet. The sample pool holds the solution based on the interface characteristics of the super-hydrophobic and super-hydrophilic surfaces, and does not require the construction of a holding cavity, so it has advantages that traditional container-type sample pools do not have.

[0056] In addition, in order to show the specific performance of the new test paper when dipped in liquid, example photos are used to show the adhesion state of the test paper sample pool at different fixed angles after dipping in liquid, as shown in the attached figure. Figure 3 It can firmly absorb liquid at different angles and different volumes and spread into water films of different thicknesses, which fully demonstrates the good performance and practicality of the test paper.

[0057] Finally, if Figure 4 As shown, an example of using the test paper to perform terahertz spectroscopy detection on water is shown, so as to fully demonstrate the convenience and practicality of using the test paper type sample cell to detect the terahertz spectrum of liquid.

[0058] The basic process of terahertz spectroscopy detection is as follows: first, a terahertz time-domain spectrometer is used to detect the sample to be tested to obtain its time domain signal E(t); then, the time domain signal is converted into a frequency domain signal E(ω) through a fast Fourier transform (FFT), and the transmission spectrum signal of the sample to be tested is obtained by extracting the amplitude value of the frequency domain signal. Finally, the transmission spectrum signal is compared with the reference signal to obtain the absorption spectrum signal of the sample to be tested.

[0059] like Figure 4As shown, firstly, a terahertz time-domain spectrometer is used to perform time-domain spectral detection on three situations: a cavity filled with nitrogen, a test paper sample pool with only one sample pool, and a sample pool filled with water, and the time-domain signals are obtained. Then, the transmission characteristics in the frequency domain are obtained after a fast Fourier transform. Finally, the terahertz spectrum absorption characteristics of water are obtained after comparison with the reference signal. It can be seen from this example that the test paper sample pool can smoothly realize the detection of the terahertz spectrum characteristics of samples such as water. Figure 4 The transmission signal intensity further confirmed that the test paper type sample cell has an extremely high terahertz transmittance of not less than 98% and no characteristic absorption.

[0060] The sample cell can realize more convenient terahertz spectroscopy detection of liquids such as water and aqueous solutions. The sample cell is based on the technical method of super-hydrophobic-super-hydrophilic surface and is prepared with solid thin sheets such as paper as substrate.

[0061] Firstly, solid sheets such as paper and silicon wafers with high transmittance in the terahertz band are selected as substrates, and their surface is microstructured.

[0062] The substrate 1 includes but is not limited to silicon wafers, rubber sheets, PE, PP, PTFE, TPX and other terahertz wave transmissive materials.

[0063] The solid sheet is then chemically modified to reduce its surface free energy, making its surface a superhydrophobic surface;

[0064] Next, the surface chemical modification layer of the set area on the surface is removed by laser precision selective etching or other methods, so that the set area has super hydrophilicity. In this way, a test paper type sample pool with a super hydrophobic-super hydrophilic patterned hybrid surface is obtained.

[0065] When in use, you only need to immerse the sample cell in an aqueous solution and then take it out. The sample cell will automatically dip into a certain volume of aqueous solution and firmly adsorb it on its super-hydrophilic area, while its super-hydrophobic area will not be wetted at all. The sample cell is also very convenient to fix when used for testing. It can be fixed vertically or horizontally in the test light path like a solid sheet. The sample cell holds and controls liquids based on the interface characteristics of super-hydrophobic and super-hydrophilic surfaces, thereby achieving precise terahertz spectroscopy detection. It is different from the mechanism of traditional container-type sample cells and therefore has unique advantages.

[0066] First of all, the test paper type sample pool is easy to use. When taking liquid, you only need to dip the test paper into the solution and take it. There is no need to set up the solution inlet and outlet like the container type sample pool. When you need to take a small amount of liquid, you only need to use a precision pipette to drop a certain volume of solution into the super-hydrophilic area, and the solution will automatically spread into a water film in the area. When fixing, it can be directly fixed on the test stand of the solid sample without replacing the test stand and other accessories.

[0067] The test paper sample pool has high detection accuracy. When detecting a small amount of liquid, the sample pool can precisely control the thickness of the aqueous solution to tens to hundreds of microns. Due to the strong hydrophilicity of the super-hydrophilic area to the aqueous solution, a very small amount of liquid dropped into the area can also automatically spread to the entire hydrophilic area, thus forming a liquid film with a minimum thickness of ten microns, realizing the precise detection of trace amounts of liquid to be tested.

[0068] The test paper type sample pool has low signal loss. Since the base material is made of terahertz high-transmittance materials such as paper and is used in the shape of a thin sheet, it does not require the use of a window piece compared to a container type sample pool, and has lower signal loss and a higher signal-to-noise ratio.

[0069] Most importantly, the production cost of the test paper sample pool is extremely low, and it can be further made into a disposable test paper. Since the production process of super-hydrophobic and super-hydrophilic surfaces is relatively simple, and the substrate uses paper, etc., its cost is extremely low and the production is simple and quick. It can be further mass-produced into standardized disposable sample pools, which can greatly reduce the threshold for use and promote related research on solution terahertz spectroscopy detection.

[0070] The test paper type sample pool does not need to be cleaned. Due to its extremely low production cost, a new sample pool can be directly replaced when testing different solutions. This can avoid laborious sample pool cleaning and there is no need to worry about measurement interference caused by solution residue.

Claims

1. A method for preparing a test paper type sample cell for liquid terahertz spectroscopy detection, characterized in that: The steps include: Step 1: Select a paper sheet as a substrate (1), perform surface microstructuring and chemical modification on a part of the substrate (1), build a layer of hydrophobic base molecules on the microstructure of the substrate (1), and form a surface with super-hydrophobic properties after drying, i.e., a super-hydrophobic area (4), and the untreated area is still an ordinary surface, i.e., an unmodified area (5), which does not have super-hydrophobicity and serves as a handheld terminal; Step 2: setting an area for adsorbing the liquid to be tested in the super-hydrophobic area (4), using a laser precision selected area scanning method, scanning line by line with a laser spot, ablating and removing the hydrophobic base molecular layer on the microstructure surface of the area, and converting the area into a super-hydrophilic area (7), but without destroying the paper-based material, to form a super-hydrophobic-super-hydrophilic patterned mixed surface (8), that is, a test paper-type sample pool (9) having a super-hydrophilic surface and a super-hydrophobic-super-hydrophilic patterned mixed surface.

2. The method for preparing a test paper type sample cell for liquid terahertz spectrum detection according to claim 1, characterized in that: In the step 1, the substrate (1) is an ordinary paper sheet with a thickness of 0.2-5 mm.

3. The method for preparing a test paper type sample cell for liquid terahertz spectrum detection according to claim 1, characterized in that: In the step 1, a surface microstructuring treatment is performed by sandpaper polishing to generate a microstructure with a scale between 10 μm and 1 mm on the surface of the substrate (1).

4. The method for preparing a test paper type sample cell for liquid terahertz spectrum detection according to claim 1, characterized in that: In the step 1, the specific method of chemical modification is to immerse in a stearic acid alcohol solution (2) with a concentration of 0.01-0.5 mol / L for about 30 minutes, wherein the components of the hydrophobic base molecular layer are methyl (-CH3) and ethyl (-CH2).

5. The method for preparing a test paper type sample cell for liquid terahertz spectrum detection according to claim 1, characterized in that: To make the substrate (1) have a surface with super-hydrophobic properties, one of the following methods can be used: vapor deposition, spin coating, spray coating, imprinting or magnetron sputtering.

6. The method for preparing a test paper type sample cell for liquid terahertz spectrum detection according to claim 1, characterized in that: The substrate (1) may also be chemically modified using a chemical material such as fluorosilane or carbon tetrafluoride; The laser precision selective scanning is replaced by a method using mechanical friction or precision heating removal.

7. The method for preparing a test paper type sample cell for liquid terahertz spectrum detection according to claim 1, characterized in that: The super hydrophobic-super hydrophilic patterned hybrid surface is circular, elliptical, triangular, square, rectangular or pentagonal.

8. The method for preparing a test paper type sample cell for liquid terahertz spectrum detection according to claim 1, characterized in that: In the step 2, the laser precision selected area scanning is specifically as follows: The laser spot controlled by the galvanometer is scanned line by line, and the position accuracy during scanning is less than 5 microns, ensuring the selection accuracy of the scanning area; the spot overlap rate during scanning is not less than 20%, ensuring that all areas in the selected area are fully irradiated.

9. A method for using a test paper type sample cell for liquid terahertz spectrum detection prepared by the method according to any one of claims 1 to 8, characterized in that: The steps include: The first step is to immerse the test paper sample pool (9) in the liquid to be tested (10) and directly dip it, or use a pipette to accurately absorb a certain volume of the liquid to be tested (10), and drop it on the super-hydrophilic area (7) of the test paper sample pool (9), and the liquid automatically spreads and adheres to the super-hydrophilic area (7) without wetting the super-hydrophobic area (8); Step 2: installing the test paper type sample pool (9) for spectrum detection, fixing the test paper type sample pool (9) adsorbing the liquid to be tested at the detection position of the terahertz spectrum detection device, and performing terahertz spectrum detection.

10. The method for using the test paper type sample cell for liquid terahertz spectrum detection according to claim 9, characterized in that: During testing, the test paper type sample pool (9) is fixed vertically or horizontally in the test light path (13).

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