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Application of two-dimensional titanium carbide nanosheet in Raman test, Raman test substrate and preparation method of Raman testing substrate

A nanosheet and substrate technology, applied in the direction of titanium carbide, carbide, Raman scattering, etc., can solve the problems of performance degradation and interaction weakening, and achieve the effect of high sensitivity

Active Publication Date: 2020-05-12
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is well known that the SERS effect is very sensitive to distance, and sometimes the interaction between the analyte and the reinforcing matrix is ​​weakened to some extent, leading to a decrease in performance.
Therefore, it is desirable to design a reinforced substrate with molecules on the surface of the substrate and maintain the intrinsic structure and orientation of the molecules, but it is extremely challenging.

Method used

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  • Application of two-dimensional titanium carbide nanosheet in Raman test, Raman test substrate and preparation method of Raman testing substrate
  • Application of two-dimensional titanium carbide nanosheet in Raman test, Raman test substrate and preparation method of Raman testing substrate
  • Application of two-dimensional titanium carbide nanosheet in Raman test, Raman test substrate and preparation method of Raman testing substrate

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preparation example Construction

[0031] Ti of the present invention 3 C 2 The preparation method of nanosheets is as follows. 3 AlC 2 The powder is added to the organic alkali aqueous solution, and centrifuged after stirring to obtain Ti 3 C 2 Nanosheets.

[0032] The preparation method of the Raman test substrate of the present invention is as follows: 3 AlC 2 The powder is added to the organic alkali aqueous solution, and centrifuged after stirring to obtain Ti 3 C 2 nanosheets; then Ti 3 C 2 The nanosheets are dispersed in water to form a colloidal solution; then the colloidal solution is drop-coated on a non-metallic carrier to obtain a Raman test substrate. Especially surface-enhanced Raman substrates.

[0033] In the present invention, the surface-enhanced Raman test method is as follows: put the Raman substrate loaded with the analyte on the stage, (1) set the instrument parameters, and set the filter (laser attenuation) to D 0.3 (50%) , the confocal aperture and slit are set to 400 and 100...

Embodiment 1

[0035] At room temperature, 1 g Ti 3 AlC 2 The powder (Beijing Forsman Company) was stirred in 10 ml aqueous tetramethylammonium hydroxide (TMAOH, 25 wt%) at 350 rpm for 24 hours, then washed by centrifugation, and dispersed in H 2 Centrifugation at 3500 rpm after shaking in O can yield Ti at a concentration of 1.3 mg / ml 3 C 2 -Al(OH) 4 The colloidal solution of nanosheets was used in Example 2.

[0036] For Ti with a passivation layer on the surface 3 AlC 2 The powder, was treated with very dilute HF (10 wt% HF) for 5 min before addition of aqueous tetramethylammonium hydroxide to remove the surface passivating oxide layer.

Embodiment 2

[0043] The Ti of Example 1 3 C 2 -Al(OH) 4 The colloidal solution of the sheet was dropped on a silicon substrate (Zhongjing Keyi Co., Ltd.), and then it was naturally flattened and dried in the air to obtain a SERS active substrate. Preparation of monolayers of Ti on silicon substrates 3 C 2 -Al(OH) 4 sheet; in-plane X-ray diffraction characterization was performed, and the pattern can be assigned to a hexagonal unit cell, which is in good agreement with the parent structure in the ab plane ( Figure 4 d), which proves that the main structure is well maintained.

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Abstract

The invention discloses an application of a two-dimensional titanium carbide nanosheet in a Raman test, a Raman test substrate and a preparation method of the Raman test substrate. The preparation method comprises the following steps: adding Ti3AlC2 powder into an organic alkali aqueous solution, stirring and centrifuging to obtain a Ti3C2 nanosheet; then the Ti3C2 nanosheet is dispersed in waterto form a colloidal solution; and dropwise adding the colloidal solution on a non-metal carrier to obtain the Raman test substrate. The in-situ modified titanium carbide nanosheet containing the aluminum oxyanions is used as an active carrier for Raman testing, so that the abnormal sensitivity but non-selectivity enhancement is realized. In addition, the SERS effect of the modified titanium carbide is suitable for various different analyte molecules which comprise molecules of organic dyes and trace harmful compounds.The detection limit of a Raman detection substrate prepared from the Ti3C2 nanosheet is 8 * 10 <-12> and is lower than that of a blank substrate, a Ti3C2-OH / F sheet and even a noble metal substrate which generate the same signal intensity.

Description

technical field [0001] The invention belongs to Raman testing technology, in particular to an application of a two-dimensional titanium carbide nanosheet in Raman testing, a Raman testing substrate and a preparation method thereof. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS) is a powerful non-invasive vibrational spectroscopy technique that provides orders of magnitude enhancement of Raman intensity, which combines the specificity of Raman features with high sensitivity, allowing even orders of magnitude smaller molecules to be determined. Chemical properties and structural information. The success of SERS largely depends on the selection of a suitable reinforcement matrix. Existing SERS-active substrates are mainly composed of two main types of materials, including Au, Ag, and Cu metals with rough surfaces, or nanostructured semiconductors with non-stoichiometric or amorphous features. A key contribution of metal substrates is electromagnetic ...

Claims

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Application Information

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IPC IPC(8): G01N21/65C01B32/921B82Y40/00
CPCG01N21/658C01B32/921B82Y40/00C01P2004/64
Inventor 耿凤霞李国辉邱天伦
Owner SUZHOU UNIV
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