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Preparation method and application of SERS film substrate based on MXene

A substrate and thin film technology, applied in chemical instruments and methods, nanotechnology for sensing, inorganic chemistry, etc., can solve problems such as unsatisfactory Raman enhancement effect, achieve excellent SERS enhancement effect, large monolithic area, Simple preparation process

Pending Publication Date: 2021-11-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Typical Ti 3 C 2 MXene self-supporting layered material as a SERS substrate, but its Raman enhancement effect is not ideal

Method used

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  • Preparation method and application of SERS film substrate based on MXene
  • Preparation method and application of SERS film substrate based on MXene
  • Preparation method and application of SERS film substrate based on MXene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The preparation method of self-supporting layered material TiVC is as follows:

[0066] (1) Take 30mL of hydrochloric acid with a concentration of 9M and put it in a polytetrafluoroethylene beaker, weigh 2.8g of LiF powder and dissolve it in the hydrochloric acid solution, and stir magnetically at 20-30°C for 10min to completely dissolve the LiF powder. Weigh 2g of TiAlVC powder and slowly add it to the mixed solution of lithium fluoride-dilute hydrochloric acid at a rate of 1g / 10min, cover with a layer of plastic wrap, and stir magnetically at 20-30°C for 10min. The beaker was transferred to a water bath at a constant temperature of 35°C, and the reaction was carried out for 72 hours under magnetic stirring. After the reaction is over, transfer the resulting sol-like liquid to a centrifuge tube, add deionized water, and centrifuge at 3500rpm / min to wash thoroughly, take the precipitate, repeat several times, each time for 5min, until the supernatant after centrifugatio...

Embodiment 2

[0070] In this embodiment, compared with embodiment 1, the difference is:

[0071] In step (1), the reaction system was placed in a water bath at a constant temperature of 40° C. to react, and finally a self-supporting TiVC film SERS substrate was obtained.

[0072] Take 5 μL of the ethanol solution of R6G with a concentration of 1 mM and drop it on the surface of the SERS substrate prepared in Example 2. After it dries naturally, put it under a micro Raman spectrometer for detection.

[0073] Such as figure 2 As shown in a, the SEM photo of the two-dimensional TiVC nanosheets prepared in Example 2 on porous alumina, the TiVC nanosheets are highly transparent under electron beam irradiation; figure 2 b is the TEM photo of the prepared few-layer TiVC nanosheets. It can be seen that the obtained two-dimensional TiVC nanosheets have two layers, indicating that the prepared two-dimensional material TiVC is a thin-layer nanosheet.

[0074] Such as image 3 Shown is the SEM pho...

Embodiment 3

[0082] In this embodiment, compared with embodiment 1, the difference is:

[0083] In step (1), the reaction time is set to 84h, and finally a self-supporting film TiVC is obtained.

[0084] Such as Figure 10 Shown is the SEM photo of the self-supporting film TiVC described in Example 3.

[0085] Such as Figure 11 Shown is the Raman spectrum of the self-supporting film TiVC prepared in Example 3 used as the SERS substrate to detect different concentrations of R6G.

[0086] Such as Figure 12 As shown, we calculated the energy band and electronic density of states (DOS) of TiVC. The results show that: TiVC has obvious metal characteristics, and the conduction band is mainly composed of Ti 3d orbital and V 3d orbital, and V 3d orbital is in The contribution at the Fermi level is greater than that of Ti 3d orbitals, which further explains the excellent electronic conductivity of TiVC, which is conducive to the generation of strong surface plasmon resonance, which plays a ro...

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Abstract

The invention discloses a preparation method and application of an SERS film substrate based on MXene, and relates to the technical field of SERS spectrums. The method comprises the steps of selectively etching away an Al atomic layer in a precursor MAX material by using lithium fluoride-hydrochloric acid as an etching layering agent; repeatedly cleaning the obtained double-transition metal carbide two-dimensional layered material with deionized water, and centrifuging; dispersing in deionized water, shaking, and carrying out centrifugal suction filtration; and obtaining the novel self-supporting SERS film substrate. The preparation method disclosed by the invention is simple to operate and low in cost, has the advantages of high sensitivity, good Raman enhancement effect, high reproducibility and the like, can be applied to trace detection in the fields of environment, food safety, biomarkers and the like, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of surface-enhanced Raman scattering spectroscopy, in particular to a preparation method and application of an MXene-based SERS film substrate. [0002] technical background [0003] Raman scattering spectroscopy is based on the Raman scattering effect discovered by Indian scientist Chandrasekhara Venkata Raman in 1928. It analyzes the scattering spectrum different from the frequency of incident light to study molecular vibration and rotation information, and obtains a detection and analysis technology of molecular structure. . However, the Raman scattering cross-section is small and in the process of detecting materials with strong fluorescent background, the generated Raman signal is easily overwhelmed by fluorescence; in addition, the low sensitivity defect in trace detection restricts the application of Raman scattering . [0004] Until the mid-1970s, three research groups led by Fleischmann, VanDuyne a...

Claims

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Application Information

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IPC IPC(8): C01B32/90G01N21/65B82Y40/00B82Y15/00
Inventor 王凤平何志权李岩马骏杰何康
Owner UNIV OF SCI & TECH BEIJING
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