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Preparation method of a colorimetric stress sensor based on ag nanoparticle assembly

A stress sensor and nanoparticle technology, applied in the field of colorimetric stress sensor preparation, can solve the problems of high price, low Au storage capacity, and high cost

Active Publication Date: 2020-11-24
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Firstly, the storage capacity of Au is low, the price is high, and the cost is high; secondly, due to the limitation of the plasmon resonance characteristics of Au nanoparticles, the Au nanoparticle assembly can only change from blue to red, and the color change range is narrow, which is not conducive to visualization. Applications

Method used

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  • Preparation method of a colorimetric stress sensor based on ag nanoparticle assembly
  • Preparation method of a colorimetric stress sensor based on ag nanoparticle assembly
  • Preparation method of a colorimetric stress sensor based on ag nanoparticle assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for preparing a colorimetric stress sensor based on an Ag nanoparticle assembly, comprising the following steps: dispersing an Ag nanoparticle assembly with an SPR absorption range of 400-490nm in deionized water, and preparing a concentration of 5 mg / mL for later use.

[0041] Heat and dissolve polyvinyl alcohol (PVA) (Mw=130000) at 90° C. to prepare a PVA aqueous solution with a concentration of 10 wt. % for later use.

[0042] Take 300uL of the above-mentioned Ag nanoparticle assembly solution (5mg / mL), 10g of polyvinyl alcohol (PVA) aqueous solution (10wt.%) and 0.1g of polyethylene glycol (PEG) (Mn=800) and mix them with mechanical stirring. .

[0043] Pour the uniformly mixed PVA / Ag nanoparticle assembly into a mold with a length*width*height of 6cm*4cm*2cm, and heat it at 40°C to form a film to obtain a colorimetric stress sensor.

[0044] The composite film prepared in this embodiment can change from blue-purple to red to orange and finally to yellow m...

Embodiment 2

[0046] Embodiment 2, change the SPR absorption range of Ag nanoparticle assembly

[0047] As described in Example 1, a method for preparing a colorimetric stress sensor based on an Ag nanoparticle assembly includes the following steps:

[0048] Disperse the Ag nanoparticle assembly with the SPR absorption range of 400-550nm in deionized water, and prepare the concentration at 5mg / mL for later use.

[0049] Heat and dissolve PVA (Mw=130000) at 90° C., and prepare a PVA aqueous solution with a concentration of 10 wt. % for later use.

[0050] Take 300uL of the above-mentioned Ag nanoparticle assembly (5mg / mL), 10g of polyvinyl alcohol (PVA) aqueous solution (10wt.%) and 0.1g of polyethylene glycol (PEG) (Mn=800) and mix them with mechanical stirring. Pour the uniformly mixed PVA / Ag nanoparticle assembly into a mold with a length*width*height of 6cm*4cm*2cm, and heat it at 40°C to form a film to obtain a colorimetric stress sensor.

[0051]The colorimetric stress sensor is dark...

Embodiment 3

[0052] Embodiment 3, PVA is changed into polyvinylpyrrolidone PVP

[0053] As described in Example 1, a method for preparing a colorimetric stress sensor based on an Ag nanoparticle assembly includes the following steps:

[0054] Disperse the Ag nanoparticle assembly with the SPR absorption range of 400-490nm in deionized water, and prepare the concentration of 5mg / mL for later use.

[0055] Heat and dissolve polyvinylpyrrolidone (PVP) (Mw=30000) at 90° C. to prepare an aqueous solution with a concentration of 12 wt. % for later use.

[0056] Take 300uL of the above-mentioned Ag nanoparticle assembly (5mg / mL), 10g of PVP aqueous solution (12wt.%) and 0.1g of polyethylene glycol (PEG) (Mn=800) and mix them with mechanical stirring.

[0057] Pour the evenly mixed PVA / Ag nanoparticle assembly into a mold with length*width*height 6cm*4cm*2cm, and heat it at 60°C to form a film to obtain a colorimetric stress sensor.

[0058] The colorimetric stress sensor is blue-purple macrosco...

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Abstract

The invention relates to a preparation method for a colorimetric stress sensor based on an Ag nanoparticle assembly, and the method comprises the steps: dispersing the Ag nanoparticle assembly in a polar solvent, mixing the Ag nanoparticle assembly with a film forming polymer solution, adding polyethylene dioxide, and performing uniform stirring and defoaming to obtain a mixed solution; drying themixed solution to form a film, and obtaining the colorimetric stress sensor. According to the invention, the Ag nanoparticle assembly is employed as a raw material to prepare a visualized stress color-changing film, which can realize a wider range of color change from blue to yellow. Compared with Au, Ag is lower in price, so the method is more practical.

Description

technical field [0001] The invention relates to a method for preparing a colorimetric stress sensor based on an Ag nanoparticle assembly, which can realize macroscopic color changes from blue to yellow under different tension and pressure, and belongs to the field of intelligent materials. Background technique [0002] Due to their strong plasmon resonance properties, noble metal nanomaterials have a strong absorption effect on visible light, and thus present different colors. The surface plasmon resonance (SPR) properties of noble metal nanomaterials mainly depend on the size, shape and dielectric constant of the material. In addition, in the noble metal nanoparticle assembly, the coupling between adjacent particles can also produce a strong plasmon resonance effect, and the regulation of the plasmon resonance effect can be realized by adjusting the distance between particles, thereby obtaining a macroscopically presented Assemblies of different colors. At present, the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L11/02G01L1/24C08J5/18C08L29/04C08L39/06C08L71/02C08K3/08
CPCC08J5/18C08J2329/04C08J2339/06C08J2371/02C08J2471/02C08K2003/0806C08K2201/011G01L1/24G01L11/02
Inventor 王文寿刘伦涛高宗朋姜宝来
Owner SHANDONG UNIV
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