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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., can solve the problems of poor SERS performance, uneven distribution, and rarely reported preparation methods, avoiding the use of strong reducing agents, and achieving low cost. , Enhance the effect of excellent effect

Active Publication Date: 2019-05-31
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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
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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 preparation method of Ag / MXene-Ti3C2 composite material with high SERS activity. The sodium citrate and MXene-Ti3C2 are used as reducing agents, and the sodium citrate and the polyvinylpyrrolidone solution are sequentially added to silver nitrate solution at a room temperature, then the MXene-Ti3C2 solution is added into the mixed solution after uniform mixing, and the Ag / MXene-Ti3C2 composite material is obtained after water bath. The method is simple in operation and low in cost, the prepared Ag / MXene-Ti3C2 composite material can be taken as a substrate to enhance the probe molecule Raman signal, the enhancement effect is excellent, and the enhancement factor can reach 2.24*105.

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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IPC IPC(8): G01N21/65
Inventor 鲁颖炜杨英英仲洪海
Owner HEFEI UNIV OF TECH
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