Renewable two-dimensional compound film and production method and application thereof

A composite film and reaction technology, applied in the direction of material electrochemical variables, etc., can solve problems such as difficulty in regulating the area of ​​two-dimensional nano-gold single-layer film, affecting the health of operators, environmental pollution, etc., and achieve good self-supporting performance and renewable performance, facilitate large-scale implementation, simple and controllable process

Active Publication Date: 2020-02-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the force between particles in the interfacially assembled nano-gold film is weak, and there are defects that it is easy to break and difficult to transfer, which affects its practical application.
The area of ​​the macroscopic two-dimensional gold nanometer monolayer film is difficult to control, resulting in poor reproducibility
In addition, the interface assembly method requires the use of volatile organic solvents (such as toluene, pentanol, hexane, etc.) as an oil phase that is immiscible with water, causing environmental pollution and affecting the health of operators

Method used

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  • Renewable two-dimensional compound film and production method and application thereof
  • Renewable two-dimensional compound film and production method and application thereof
  • Renewable two-dimensional compound film and production method and application thereof

Examples

Experimental program
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preparation example Construction

[0032] An aspect of the embodiments of the present invention provides a method for preparing a renewable two-dimensional composite membrane, which includes:

[0033] A first ligand, a second ligand and a gold source are provided, wherein the first ligand is reductive and has a reducing functional group capable of combining with the gold source, and the second ligand can be combined with the gold source Reducing functional groups undergo chemical cross-linking reactions and can undergo self-polymerization reactions;

[0034] Using the first ligand as a reducing agent and a stabilizer to reduce the gold source in situ to form gold nanoparticles with a surface rich in reducing functional groups; and, allowing the second ligand to self-polymerize at the water / air interface reaction, and the chemical cross-linking reaction between the second ligand and the reducing functional group on the surface of the gold nanoparticle at the water / air interface, thereby inducing the self-assembl...

Embodiment 1

[0084] Example 1: Nano-gold-dopamine renewable two-dimensional composite film humidity sensor, its preparation method and application

[0085] (1) Preparation of gold nanoparticles in situ reduced by PEI: PEI functionalized gold nanoparticles (PEI / AuNPs) were obtained by in situ reduction of chloroauric acid with amino groups in PEI. First, PEI (69.4 mg) was dissolved in deionized water (10 mL), and 153 μL (0.1M) HAuCl 4 As an aqueous solution, heat in an oil bath at 65°C and stir rapidly for 2h. The synthesized wine-red PEI / AuNPs were stored in a refrigerator at 4°C until use;

[0086] (2) Preparation of nano-gold-dopamine composite two-dimensional membrane: take a petri dish with a diameter of 75 mm, add 15 mL of deionized water, dissolve 40 mg of dopamine hydrochloride in deionized water, add 3 mL of the PEI / AuNPs original solution synthesized above and 2 mL of Tris buffer (tris, 100 mmol / L, pH=8.5). After standing for more than 12 hours, a thin film can be formed at the...

Embodiment 2

[0088] Example 2: Nano-gold-dopamine renewable two-dimensional composite film humidity sensor, its preparation method and application

[0089] This embodiment is basically the same as Embodiment 1, the difference is:

[0090] In step (1), polyacrylamide is used to replace PEI in Example 1, and HAuCl is reduced in situ 4 The temperature of the aqueous solution was 60°C.

[0091] Step (2) The self-polymerization reaction of dopamine and the chemical cross-linking reaction of dopamine and the reducing functional group on the surface of gold particles are all carried out at room temperature, wherein the concentration of gold nanoparticles is 0.1mmol / L, and the concentration of dopamine is 0.1mg / mL , the concentration of tris buffer is 0.1mmol / L.

[0092] Step (3) The construction and performance testing of the humidity sensor are basically the same as those in Embodiment 1.

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Abstract

The invention discloses a renewable two-dimensional compound film and a production method and application thereof. The production method comprises providing a first ligand, a second ligand and a goldsource, wherein the first ligand has reducing functional groups capable of being bound to the gold source, the second ligand and the reducing functional groups can be subjected to a chemical cross-linking reaction, and the second ligand can be subjected to a self-polymerization reaction; reducing the gold source in situ by means of the first ligand to form gold nanoparticles with surfaces rich inreducing functional groups; and subjecting the second ligand to the self-polymerization reaction on a water / air interface, and subjecting the second ligand and the reducing functional groups to the chemical cross-linking reaction on the water / air interface to form the renewable two-dimensional compound film. The renewable two-dimensional compound film is controllable in area, good in stability andeasy to transfer, has good self-supporting performance and renewable performance, and can be used for building a humidity sensor, and a lamp switch is driven by humidity-light / heat, so that the humidity sensor is used for monitoring human health indicators in real time.

Description

technical field [0001] The present invention relates to a nanoparticle / polymer composite material, in particular to a nano-gold-PEI-dopamine renewable two-dimensional composite film and its preparation method, and its application in humidity sensors for monitoring human health indicators. It belongs to the field of nanoparticle / polymer composite material technology and application. Background technique [0002] Two-dimensional single-layer gold nanofilms have potential applications in many fields, such as optoelectronic devices, sensing, catalysis, surface-enhanced Raman spectroscopy (SERS), etc. Therefore, the related research of two-dimensional single-layer gold nano-film is very important. So far, the methods for preparing two-dimensional single-layer gold nano-film mainly include Langmuir-Blodgett (LB) method (Chem.Res., 2007,40,393-401), solvent evaporation method (Nat.Mater.,2006,5,265-270) , Electrophoretic deposition method (Langmuir, 2013, 29, 4242-4251) and block...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08L79/04C08K3/08C08J5/18C08J3/24C08G73/06G01N27/26
CPCC08G73/0672C08J3/246C08J5/18C08J2379/04C08J2379/08C08J2479/04C08J2479/08C08K2003/0831C08K2201/011G01N27/26
Inventor 黄又举陈涛宋丽平陈黎明
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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