A recyclable flexible surface-enhanced Raman scattering substrate and its preparation and application

A technology that enhances Raman scattering and flexible surfaces. It is used in Raman scattering, textiles and papermaking, physical processing, etc. It can solve the problems of only one use and cannot be recycled, and achieve the effect of expanding the light response range.

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

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a reusable flexible surface-enhanced Raman scattering substrate and its preparation and application, which overcomes the prior art that causes the SERS substrate to be used only once during Raman testing and cannot be recycled defects, the invention uses TiO 2 As a photocatalyst, it was finished on cotton fabric to prepare a Cotton-TiO 2 Cotton fabrics were then in situ reduced on Cotton-TiO 2 Depositing Ag NPs on the surface of cotton fabrics to prepare highly sensitive and recyclable flexible SERS-cotton fabrics

Method used

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  • A recyclable flexible surface-enhanced Raman scattering substrate and its preparation and application
  • A recyclable flexible surface-enhanced Raman scattering substrate and its preparation and application
  • A recyclable flexible surface-enhanced Raman scattering substrate and its preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Prepare a mixed solution of tetrabutyl titanate, glacial acetic acid and ethanol, with a total volume of 36.6 mL and a molar ratio of 1:5:2. Prepare 180mL of glacial acetic acid solution with a pH of 2, add the mixture of tetrabutyl titanate, glacial acetic acid and ethanol dropwise to the glacial acetic acid solution at a rate of 1 drop / Sec, and control the reaction temperature at 30°C during the dropping process , the speed is 1200r / min. After the dropwise addition, the reaction was continued for 2 hours, and the sol obtained in the experiment was aged for 7 days, and finally placed in an autoclave at 120° C. for 2 hours for thermal crystallization treatment to obtain anatase titanium dioxide hydrosol.

[0041] The cotton fabric was soaked in NaOH solution (1M, liquor ratio 1:30), and shaken for 30min at a water bath temperature of 90°C. Take out the treated cotton fabric, wash it well and then dry it. according to figure 1 Schematic diagram of the preparation of ...

Embodiment 2

[0047] In this embodiment, the recyclable SERS-cotton fabric prepared in Example 1 is selected, and it is respectively placed in a concentration of 10 -5 M, 10 -6 M, 10 -7 M, 10 -8 M and 10 -9 In the R6G solution of M, the volume of the solution is 20ml, let stand for 20min, and dry at 60°C. The recyclable SERS-cotton fabrics loaded with different concentrations of R6G molecules were tested using a laser micro-Raman spectrometer (Invia-reflex) from Renishaw, UK. A 633nm He-Ne gas laser was used as the excitation light source, the grating was 1200line / mm, and its Raman spectrum in the range of 500-2000nm was measured at room temperature.

[0048] Figure 4 Shows the detection sensitivity of recyclable SERS-cotton fabrics to R6G. It can be seen from the figure that the recyclable SERS-cotton fabric has good sensitivity, and its detection limit for R6G can reach 10 -9 M.

Embodiment 3

[0050] In this embodiment, the recyclable SERS-cotton fabric prepared in Example 1 is selected, and it is placed in a concentration of 10 -5 In the R6G solution of M, the volume of the solution is 20ml, let stand for 20min, and dry at 60°C. It was irradiated under ultraviolet light for different time, respectively 30min, 60min, 90min, 120min and 180min. Using the laser micro-Raman spectrometer (Invia-reflex) of Renishaw Company in the United Kingdom, the recyclable SERS-cotton fabric irradiated with ultraviolet light for different times was tested. A 633nm He-Ne gas laser was used as the excitation light source, the grating was 1200line / mm, and its Raman spectrum in the range of 500-2000nm was measured at room temperature.

[0051] Figure 5 (a) is the surface-enhanced Raman spectrum of R6G under the irradiation of ultraviolet light at different times. (b) It is a recyclable fabric at 1595cm after being irradiated with ultraviolet light for different times -1 The R6G Raman...

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Abstract

The invention relates to a recyclable flexible surface-enhanced Raman scattering substrate and its preparation and application. Titanium dioxide particles are deposited on the surface of cotton fabrics by ultrasonic impregnation to prepare Cotton-TiO 2 fabric, and by in situ reduction method in Cotton‑TiO 2 Ag NPs were grown on the surface of the fabric to obtain a recyclable surface-enhanced Raman-cotton fabric substrate. TiO 2 Combined with Ag NPs, a recyclable SERS‑cotton fabric was prepared to realize the recycling of the substrate.

Description

technical field [0001] The invention belongs to the field of Raman scattering substrate material and its preparation and application, in particular to a recyclable flexible surface enhanced Raman scattering substrate and its preparation and application. Background technique [0002] With the development of nanotechnology and the improvement of the performance of instruments and equipment, the application of SERS technology has attracted more and more attention of researchers. The surface structure of a SERS substrate determines its SERS performance, such as sensitivity, repeatability, and stability. Therefore, research on the preparation of SERS substrates is a hot spot in the field of SERS. [0003] At present, metal nanoparticles are a kind of SERS active substrate that has been studied more. Due to the special localized plasmon resonance characteristics of Ag NPs, Ag NPs are one of the most commonly used SERS active substrate materials. Ag NPs as SERS active substrates m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/46D06M11/83D06M10/06C23C18/44G01N21/65D06M101/06
CPCC23C18/1641C23C18/44D06M10/06D06M11/46D06M11/83D06M2101/06G01N21/658
Inventor 葛凤燕陈艳敏
Owner DONGHUA UNIV
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