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Graphene oxide film/poly-4-vinyl pyridine/porous three-dimensional flower-shaped micron silver composite material preparation method

A vinylpyridine, graphene film technology, applied in chemical instruments and methods, analytical materials, material excitation analysis, etc., can solve problems such as morphology and structure control, and achieve the effect of trace detection.

Inactive Publication Date: 2019-07-26
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The flower-like silver microstructures obtained by wet chemical methods are usually composed of many small silver nanosheet structural units. However, the existing synthesis techniques and methods cannot further analyze the morphology and structure of these small silver nanosheet structural units. regulation, such as the formation of nanopores on its surface

Method used

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  • Graphene oxide film/poly-4-vinyl pyridine/porous three-dimensional flower-shaped micron silver composite material preparation method
  • Graphene oxide film/poly-4-vinyl pyridine/porous three-dimensional flower-shaped micron silver composite material preparation method
  • Graphene oxide film/poly-4-vinyl pyridine/porous three-dimensional flower-shaped micron silver composite material preparation method

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preparation example Construction

[0015] The present invention relates to a preparation method of graphene oxide film / poly4-vinylpyridine / porous three-dimensional flower-like micron silver composite material, which includes step 1, step 2, and step 3.

[0016] Step 1: Drop the ethanol solution of graphene oxide (GO) on the silica gel stamp, transfer the GO to the substrate using the stamp imprint transfer method, and obtain the GO film after the ethanol is volatilized;

[0017] Step 2: Immerse the obtained GO film into a sealed tube containing 4-vinylpyridine (4VP) monomer, fill it with nitrogen, and irradiate it with ultraviolet light for 30 to 180 minutes. After the reaction, the GO film is taken out and rinsed to obtain the GO film / P4VP;

[0018] Step 3: Soak the obtained GO membrane / P4VP directly into the silver ammonia solution for 10min~12h, then take out the GO membrane / P4VP and directly soak into NaBH 4 In the aqueous solution for 30 minutes to 2 hours, take it out for cleaning to obtain a graphene oxide fil...

Embodiment 1

[0028] The schematic diagram of the preparation of graphene oxide film / poly4-vinylpyridine / porous three-dimensional flower-like micron silver composite material is as follows figure 1 Shown.

[0029] Step 1: Disperse graphene oxide in an ethanol solution ultrasonically, and prepare an ethanol solution of 0.05 mg / mL graphene oxide. Drop the ethanol solution of graphene oxide on the silica gel stamp, transfer GO to the silicon wafer using the stamp imprint transfer method, and naturally dry to remove the ethanol to obtain the GO film.

[0030] Step 2: Immerse the obtained GO film into a sealed tube containing 4-vinylpyridine (4VP) monomer, fill it with nitrogen, and irradiate it with ultraviolet light with a wavelength of 350nm for 4 hours at room temperature. After the reaction, the GO film is taken out and used Chloroform rinses to remove the P4VP polymer that has not been grafted onto the GO surface to obtain GO membrane / P4VP.

[0031] Step 3: Soak the obtained GO membrane / P4VP dir...

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Abstract

The invention relates to the field of graphene-based composite materials, in particular to a preparation method of a graphene oxide film / poly-4-vinyl pyridine / porous three-dimensional flower-shaped micron silver composite material by utilizing hydrogen generated by sodium borohydride during reduction of silver ammonia ions to generate silver nano holes. The preparation method includes the following steps: step 1. preparing a graphene oxide film; step 2. preparing graphene oxide film / poly-4-vinyl pyridine; and step 3. soaking the graphene oxide film / poly-4-vinyl pyridine in a silver ammonia solution for 10 minutes to 12 hours, then taking out and directly soaking in a NaBH4 aqueous solution for 30 minutes to 2 hours, taking out and cleaning to obtain the graphene oxide film / poly-4-vinyl pyridine / porous three-dimensional flower-shaped micron silver composite material. The composite material can be used as a SERS active substrate with high sensitivity for trace detection of small molecular compounds.

Description

Technical field [0001] The present invention relates to the field of graphene-based composite materials, and more to a method that uses hydrogen generated by self-decomposition of sodium borohydride to reduce silver ammonia ions to produce nano-holes on the surface of a three-dimensional flower-shaped micron silver structure, thereby obtaining graphene oxide film / poly Preparation method of 4-vinylpyridine / porous three-dimensional flower-like micron silver composite material. Background technique [0002] The silver microstructure with three-dimensional flower-like morphology and its unique hierarchical structure make it highly valued in the field of surface-enhanced Raman scattering (SERS) detection. The flower-like silver microstructures obtained by wet chemical methods are usually composed of many small silver nano-sheet-like structural units. However, the existing synthesis technology and methods cannot further morphology and structure of these small silver nano-sheet-like str...

Claims

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Application Information

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IPC IPC(8): B01J20/281B01J20/286G01N21/65
CPCB01J20/281B01J20/286G01N21/658
Inventor 冯丽华李萍王文钦
Owner NINGBO UNIV
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