Preparation method of silicon wafer/poly-2-vinylpyridine brush/polypyrrole-gold nanoparticle composite material

A technology of vinylpyridine brush and vinylpyridine, which is applied in the field of conductive polymer noble metal composite materials, can solve the problems of limited and enhanced Raman signal ability, and achieve the effect of strong SERS activity

Active Publication Date: 2017-03-08
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the small spherical noble metal nanostructures prepared by traditional methods using polymer brushes have limited ability to enhance Raman signals.

Method used

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  • Preparation method of silicon wafer/poly-2-vinylpyridine brush/polypyrrole-gold nanoparticle composite material
  • Preparation method of silicon wafer/poly-2-vinylpyridine brush/polypyrrole-gold nanoparticle composite material
  • Preparation method of silicon wafer/poly-2-vinylpyridine brush/polypyrrole-gold nanoparticle composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Dip the silicon wafer coated with silicon dioxide on the surface into a toluene solution (10 wt%) containing 3-aminopropyltriethoxysilane, and ultrasonicate for 30 minutes to form amino groups on the surface of the silicon wafer. Subsequently, the amino-modified silicon wafer was immersed in a sealed tube containing 2-vinylpyridine monomer, and irradiated with ultraviolet light (wavelength 350nm) for 1.5 hours at room temperature. P2VP polymers branched onto silicon wafers, yielding silicon wafer / P2VP brushes.

[0029] figure 2 It is the XPS diagram of the silicon wafer / P2VP brush. In the figure, 01s, Si2s, and Si2p belong to the silicon dioxide layer on the silicon wafer, and C1s and N1s belong to the P2VP; thus proving that the P2VP polymer brush has been successfully grafted to the silicon wafer surface .

[0030] Step 2: Soak the silicon wafer / P2VP brush obtained in step 1 in an aqueous solution of chloroauric acid (1% wt) for 12 hours, then take it out a...

Embodiment 2

[0034] Step 1: Use Step 1 of Embodiment 1 to obtain a silicon wafer / P2VP brush.

[0035]Step 2: Soak the silicon wafer / P2VP brush obtained in step 1 in an aqueous solution of chloroauric acid (1% wt) for 12 hours, then take it out and wash it with deionized water to remove unadsorbed chloroauric acid. Subsequently, the adsorbed AuCl 4 - The ionic P2VP brush is placed in a closed container containing pyrrole solution, and the poly 2-vinylpyridine brush is not in contact with pyrrole, and the pyrrole vapor formed by volatilization of the pyrrole solution is combined with the AuCl in the P2VP brush. 4 - Ion reaction, controlled reaction time 120min, pyrrole vapor was AuCl 4 Oxidative polymerization into polypyrrole, while AuCl 4 - The ions themselves are reduced to flower-like Au nanostructures.

[0036] image 3 (B) is the SEM image of the obtained silicon wafer / P2VP brush / PPy-Au composite material, and Au nanostructures with flower-like structure are obtained.

reference example 1

[0042] P2VP brush / PPy-Au composite as Raman substrate for detection of 4-aminothiophenol (4-ATP)

[0043] Previous theories have proved that noble metal nanostructures with complex structures can provide "hot spots" for Raman enhancement. We chose 4-aminothiophenol (4-ATP) as an example of small organic molecules to test its surface-enhanced Raman active. We chose the silicon wafer / P2VP brush / PPy-Au composite material prepared in Example 1 as the base material for the Raman test. First prepare a concentration of 1×10 -4 M in 4-ATP ethanol solution, then soak the silicon wafer / P2VP brush / PPy-Au composite into the 4-ATP solution, take it out after 6 hours, wash it with pure ethanol for 3 times, and finally dry it with a high-purity nitrogen stream , for Raman testing. Figure 5 It is the SERS spectrum of silicon wafer / P2VP brush / PPy-Au composite material and the Raman spectrum of pure solid 4-ATP, where the Raman spectrum of 4-ATP is amplified by 5 times.

[0044] From Fig...

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Abstract

The invention relates to the field of conductive macromolecular noble metal composite materials, and provides a preparation method of a silicon wafer / poly-2-vinylpyridine brush / polypyrrole-gold nanoparticle composite material. The invention aims to provide a novel method for preparing a nano gold structure of a flower-shaped structure on the surface of a polymer brush, and the prepared composite material is excellent in raman signal enhancement capacity.

Description

technical field [0001] The invention relates to the field of conductive polymer noble metal composite materials, and more specifically, relates to a method for forming a polypyrrole-gold nanocomposite material on the surface of a poly2-vinylpyrrole brush through vapor phase polymerization of pyrrole. Background technique [0002] A polymer brush is a high-density "brush" polymer formed by connecting one end of the polymer molecular chain to the surface or interface of different substrates and the other end being relatively free. In recent years, the use of polymer brushes to prepare noble metal (gold, silver, palladium) nanostructures has been extensively studied. The main preparation method is to use functional groups on the molecular chains of polymer brushes to adsorb noble metal precursor ions (such as Ag + , AuCl 4 - ), followed by a strong reducing agent (NaBH 4 ) to in situ reduce the noble metal precursor ions adsorbed on the polymer brush to the corresponding nob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/10C08L79/04C08F292/00C08F226/06C08G73/06C08K3/08
CPCC08F292/00C08G73/0611C08K3/08C08K2003/0806C08K2201/011C08L51/10C08L79/04C08F226/06
Inventor 邹晗芷王文钦商梦盈邢国科
Owner NINGBO UNIV
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