Raman spectrum detection method for reducing noise interference

Abstract

The invention discloses a Raman spectrum detection method capable of reducing noise interference, which comprises the following steps: tabletting a powder sample by using a tablet press, and detecting the obtained tablet in water by using a Raman spectrum detector. According to the method provided by the invention, the Raman test sample is subjected to tabletting treatment, so that a scattering surface is smooth, the repeatability of the test is enhanced, the signal intensity is improved to a small extent, and then the signal intensity of the Raman test is greatly improved and the interference of a fluorescence background is reduced by adding water into the tableted sample.

Description

Technical Field

[0001] The invention relates to a spectrum detection method, in particular to a Raman spectrum detection method, a Raman spectrum detection method which reduces noise interference and enhances surface Raman scattering signals. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] Raman spectroscopy testing technology is currently in a stage of rapid development. The introduction of portable devices and surface-enhanced Raman scattering (SERS) technology has significantly improved its sensitivity and application range, making it widely used in pharmaceuticals, environmental monitoring, life sciences, and materials science. The increasing market demand for high-performance and customized Raman spectrometers has driven continuous technological innovation and sustained market growth. The importance of Raman spectroscopy technology in scientific research and industrial applications is becoming increasingly prominent, but it still faces challenges such as low signal intensity and fluorescence background interference. Summary of the invention

[0004] Purpose of the invention: The technical problem to be solved by the present invention is to provide a method for Raman spectrum detection that reduces noise interference and enhances surface Raman scattering signals in view of the deficiencies in the prior art.

[0005] In order to solve the above technical problems, the present invention discloses the following technical solutions:

[0006] A Raman spectrum detection method comprises the following steps: pressing a powder sample into tablets by a tablet press, placing the obtained tablets in water and detecting them by a Raman spectrum detector.

[0007] Wherein, the sample is a sample insoluble in water.

[0008] Wherein, the sample includes carbon material, oxide, and perovskite; further, the sample includes carbon nanotubes, metal oxide and perovskite; further, the metal oxide includes trimanganese tetroxide.

[0009] Furthermore, the present invention also discloses a method for Raman spectrum detection of carbon nanotubes, wherein the carbon nanotube powder is pressed into tablets by a tablet press, and the obtained tablets are placed in water and detected by a Raman spectrum detector. The method can reduce noise interference and enhance the signal strength of the carbon nanotubes.

[0010] The present invention also discloses a method for Raman spectrum detection of metal oxides, wherein metal oxide powder is pressed into tablets by a tablet press, and the obtained tablets are placed in water and detected by a Raman spectrum detector, wherein the metal oxide includes trimanganese tetroxide. The method can increase the signal intensity of the metal oxide.

[0011] Among them, 0.005-0.01g of sample was taken and compressed into tablets using a tablet press.

[0012] The tableting pressure is 0.5 MPa, and the tableting time is 0.5-3 min. In some embodiments, a ZTMJ series cylindrical common mold with a diameter of 5 mm and a 769YP-40C powder tablet press are used to tablet the test sample.

[0013] Wherein, the thickness of the sheet is 1-2 mm.

[0014] Wherein, the laser intensity detected by the Raman spectrometer is 100%.

[0015] Wherein, the lens used by the Raman spectrometer is a 50x lens.

[0016] The present invention has no specific requirements on the quality and particle size of the sample powder, and the powder only needs to be pressed into a compact and flat sheet.

[0017] There is no specific requirement for the amount of water used in the present invention, as long as the water can cover the sheet. In some embodiments, a glass slide with a groove is used, the sheet is placed in the groove, and water is added so that the water covers the sheet.

[0018] The method provided by the present invention does not require pretreatment or the addition of metal active bases. The Raman test sample is directly pressed into a tablet to make the scattering surface smooth, thereby enhancing the repeatability of the test and slightly improving the signal intensity. Thereafter, the pressed sample is treated with water to greatly improve the signal intensity of the Raman test and reduce the interference of the fluorescence background.

[0019] Beneficial effects:

[0020] The present invention greatly enhances the repeatability of Raman testing by tableting, and greatly improves the signal intensity of Raman testing and reduces the interference of fluorescence background by adding water to the tableted samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the above and / or other advantages of the present invention will become more clear.

[0022] Figure 1 Raman comparison of carbon nanotube material powder sample and pressed tablet sample.

[0023] Figure 2 This is the Raman comparison of metal oxide (manganese tetroxide) material powder sample and pressed tablet sample.

[0024] Figure 3 Raman comparison of perovskite material powder sample and pressed tablet sample.

[0025] Figure 4 This is the Raman comparison of powder sample and pressed tablet sample of carbon nanotube material in water.

[0026] Figure 5 Raman comparison of perovskite powder sample and pressed tablet sample in water.

[0027] Figure 6 Raman comparison of metal oxide powder samples and pressed tablet samples in water.

[0028] Figure 7 This is the Raman test image of the carbon nanotube material pressed sample in ethanol and ethylene glycol.

[0029] Figure 8 Schematic diagram of perovskite powder sample.

[0030] Fig. 9 Schematic diagram of perovskite pressed sample.

[0031] Fig.10 Schematic diagram of the perovskite pressed sample placed in water. DETAILED DESCRIPTION

[0032] The present invention can be better understood according to the following examples. However, it is easy for those skilled in the art to understand that the contents described in the examples are only used to illustrate the present invention, and should not and will not limit the present invention described in detail in the claims.

[0033] The experimental methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials described are commercially available unless otherwise specified.

[0034] The following embodiments are all shot with a 50x lens.

[0035] Example 1

[0036] Weigh 0.005-0.01 g of carbon nanotube powder, manganese tetraoxide powder and perovskite powder respectively, and use a ZTMJ series cylindrical ordinary mold with a diameter of 5 mm and a Y769YP-40C powder tablet press at 0.5 MPa for about 1 minute to press the test sample into a disc with a thickness of 1-2 mm and a diameter of 5 mm.

[0037] The results are as follows Figure 8 , Fig. 9 As shown, Figure 8 Schematic diagram of powder sample. Fig. 9 Schematic diagram of the tablet sample.

[0038] Example 2

[0039] Raman tests were performed on the carbon nanotube powder, manganese tetraoxide powder, perovskite powder sample and the three pressed tablet samples obtained in Example 1 at a wavelength of 532 nm using a laser intensity of 5%, and each sample was tested once at three different positions.

[0040] The results are as follows Figure 1-Figure 3 As shown,

[0041] Figure 1 The Raman comparison diagrams of the carbon nanotube powder sample and the pressed tablet sample at three different positions are given. It can be found that pressing the tablet makes the Raman test results at different positions close to unity and slightly enhances the peak intensity.

[0042] Figure 2 The Raman comparison diagrams of the manganese tetroxide powder sample and the pressed tablet sample at three different positions are given. It can be found that the pressed tablet makes the Raman test results at different positions close to unity and slightly enhances the peak intensity.

[0043] Figure 3 Comparison diagrams of Raman spectra at three different positions of the perovskite powder sample and the pressed tablet sample are given. It can be found that pressing the tablet makes the Raman test results at different positions close to unity and slightly enhances the peak intensity.

[0044] Example 3

[0045] like Fig.10 As shown, a glass slide containing grooves is used, and the carbon nanotube powder sample and the pressed samples of carbon nanotubes, metal oxides and perovskites obtained in Example 1 are placed in the grooves respectively. Water is added to the grooves so that each sample is placed in water and completely covered with the sample. Raman testing is performed at a wavelength of 532nm using 100% laser intensity.

[0046] The results are as follows Figure 4-Figure 6 shown.

[0047] Figure 4 The Raman comparison diagrams of carbon nanotube powder sample and pressed tablet sample at three different positions in water are given. It can be found that placing the pressed tablet in water reduces noise interference and increases the peak intensity by about 25 times.

[0048] Figure 5 The Raman comparison diagrams of the perovskite powder sample and the pressed tablet sample at three different positions in water are given. It can be found that placing the pressed tablet in water reduces noise interference and increases the peak intensity.

[0049] Figure 6 The Raman comparison diagrams of metal oxide (trimanganese tetroxide) powder sample and pressed tablet sample at three different positions in water are given. It can be found that placing the pressed tablet in water reduces noise interference and increases the peak intensity by about 25 times.

[0050] Comparative Example 1

[0051] The carbon nanotube pellet samples obtained in Example 1 were placed in ethanol and ethylene glycol respectively and Raman tests were performed at a wavelength of 532 nm using a laser intensity of 100%.

[0052] The results are as follows Figure 7 As shown, Figure 7 The Raman test images of carbon nanotube pellets in water in ethanol and ethylene glycol are given, and it is found that the Raman peaks of ethanol and ethylene glycol themselves seriously affect the test of the samples themselves.

[0053] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for Raman spectroscopy detection, characterized in that: The powder sample was compressed into tablets using a tablet press, and the obtained tablets were placed in water and detected by a Raman spectrometer.

2. The method according to claim 1, characterized in that The sample is a water-insoluble sample.

3. The method according to claim 1, characterized in that The samples include carbon materials, oxides, and perovskites.

4. The method according to claim 1 or 3, characterized in that: The samples included carbon nanotubes, metal oxides and perovskites.

5. The method according to claim 4, characterized in that The metal oxide includes trimanganese tetroxide.

6. The method according to claim 1, characterized in that Take 0.005-0.01g of sample and compress it into tablets using a tablet press.

7. The method according to claim 1, characterized in that The tabletting pressure is 0.5 MPa, and the tabletting time is 0.5-3 min.

8. The method according to claim 1, characterized in that The thickness of the sheet is 1-2 mm.

9. The method according to claim 1, characterized in that: The laser intensity detected by the Raman spectrometer is 100%.

10. The method according to claim 1, characterized in that The lens used by the Raman spectrometer is a 50x lens.

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