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Preparation method of Ag/mxene-Ti3C2 composite material with high SERS activity

A composite material and active technology, which can be used in material excitation analysis, Raman scattering, etc., and can solve the problems of rarely reported preparation methods, poor SERS performance, and uneven distribution.

Active Publication Date: 2021-09-21
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many methods for preparing silver / graphene composites, but the preparation of metal nanoparticles / MXene-Ti 3 C 2 However, there are few reports on the preparation methods of composite materials.
At present, only Satheeshkumar.E et al. prepared Ag, Au and Pd / MXene-Ti by one-step reduction method 3 C 2 Composite materials (see: Scientific Reports.2016,6,32049.), but the Ag nanoparticles in the structure of MXene-Ti 3 C 2 Uneven distribution on the sheet leads to poor SERS performance

Method used

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  • Preparation method of Ag/mxene-Ti3C2 composite material with high SERS activity
  • Preparation method of Ag/mxene-Ti3C2 composite material with high SERS activity
  • Preparation method of Ag/mxene-Ti3C2 composite material with high SERS activity

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. The MXene-Ti 3 C 2 The solution was sonicated for 1 h in an ultrasonic machine, centrifuged at 3500 rpm for 1 h, and 5 mL of the supernatant was taken for later use;

[0022] Dissolve 95.7mg of silver nitrate in 25mL of water to make a solution for later use;

[0023] Dissolve 295mg of sodium citrate dihydrate in 25mL of water to prepare a solution for later use;

[0024] Dissolve 500mg of polyvinylpyrrolidone in 50mL of water to prepare a solution for later use.

[0025] 2. Add the sodium citrate solution dropwise to the silver nitrate solution and stir for 5 minutes, then add the polyvinylpyrrolidone solution dropwise to the mixed solution of sodium citrate and silver nitrate, and stir until the solution is evenly mixed.

[0026] 3. The MXene-Ti 3 C 2 Add the solution dropwise to the mixed solution in step 2, stir evenly, wash and dry in a water bath at 70°C for 45 hours to obtain Ag / MXene-Ti 3 C 2 composite material. The XRD pattern of obtained sample is a...

Embodiment 2

[0028] 1. The MXene-Ti 3 C 2 The solution was sonicated for 1 h in an ultrasonic machine, centrifuged at 3500 rpm for 1 h, and 5 mL of the supernatant was taken for later use;

[0029] Dissolve 95.7mg of silver nitrate in 25mL of water to make a solution for later use;

[0030] Dissolve 295mg of sodium citrate dihydrate in 25mL of water to prepare a solution for later use;

[0031] Dissolve 300mg of polyvinylpyrrolidone in 30mL of water to prepare a solution for later use.

[0032] 2. Add the sodium citrate solution dropwise to the silver nitrate solution and stir for 5 minutes, then add the polyvinylpyrrolidone solution dropwise to the mixed solution of sodium citrate and silver nitrate, and stir until the solution is evenly mixed.

[0033] 3. Then the MXene-Ti 3 C 2 Add the solution dropwise into the mixed solution, stir evenly, wash and dry in a water bath at 70°C for 45 hours to obtain Ag / MXene-Ti 3 C 2 composite material.

Embodiment 3

[0035] 1. The MXene-Ti3 C 2 Sonicate the solution for 1h in an ultrasonicator, centrifuge at 3500rpm for 1h, take 2mL supernatant, and set aside;

[0036] Dissolve 49.7mg of silver nitrate in 25mL of water to make a solution for later use;

[0037] Dissolve 147mg of sodium citrate dihydrate in 25mL of water to prepare a solution for later use;

[0038] Dissolve 200mg of polyvinylpyrrolidone in 20mL of water to prepare a solution for later use.

[0039] 2. Add the sodium citrate solution dropwise into the silver nitrate solution and stir for 5 minutes, then add polyvinylpyrrolidone dropwise into the mixed solution of sodium citrate and silver nitrate, and stir until the solution is evenly mixed.

[0040] 3. Then the MXene-Ti 3 C 2 Add the solution dropwise into the mixed solution, stir evenly, wash and dry in a water bath at 70°C for 45 hours to obtain Ag / MXene-Ti 3 C 2 composite material. The SEM photograph of the product is as Figure 4 shown.

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Abstract

The invention discloses a Ag / MXene-Ti with high SERS activity 3 C 2 The preparation method of composite material is based on sodium citrate and MXene‑Ti 3 C 2 As a reducing agent, add sodium citrate and polyvinylpyrrolidone solution to silver nitrate solution in sequence at room temperature, and then add MXene‑Ti 3 C 2 The solution is added to the mixed solution, and Ag / MXene‑Ti is obtained after water bath 3 C 2 composite material. The method is simple to operate and low in cost, and the prepared Ag / MXene‑Ti 3 C 2 The composite material can be used as a substrate to enhance the Raman signal of probe molecules, and the enhancement effect is excellent, and the enhancement factor can reach 2.24×10 5 .

Description

technical field [0001] The invention relates to a metal nanoparticle / MXene-Ti 3 C 2 Preparation of composite materials, specifically an Ag / MXene-Ti with high SERS activity 3 C 2 Methods of preparation of composite materials. Background technique [0002] MXene-Ti 3 C 2 It is another two-dimensional material with excellent optical properties that has emerged after graphene in recent years. In addition to its extremely high optical transmittance, it has also been proved to have localized surface plasmon properties in the visible light region, which can enhance the local electromagnetic field. , so it can be applied in the field of surface-enhanced Raman (SERS) detection. Compared with nano-noble metal / graphene composites, nano-noble metal / MXene-Ti 3 C 2 Composite materials have better localized surface plasmon properties in the visible region (stronger near-field enhancement capability and lower surface plasmon transmission loss), so they have greater application poten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
Inventor 鲁颖炜杨英英仲洪海
Owner HEFEI UNIV OF TECH
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