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Silver nanoparticles-assembled monolayer inverse opal structure, and preparation method and use thereof

An inverse opal structure, silver nanoparticle technology, applied in nanotechnology, coatings, measurement devices, etc., can solve the problem that the uniformity and reproducibility of SERS signals are difficult to guarantee, difficult to achieve quantitative or semi-quantitative detection, and difficult to detect. To solve problems such as trace residues of pesticides in vegetables, it can achieve the effects of easy industrial preparation, avoiding interference of background signals and stabilizing the structure.

Active Publication Date: 2017-12-15
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this detection method has realized the qualitative detection of a variety of pesticides, it also has shortcomings. First, the uniformity of the distribution of silver nanoparticles on the surface of vegetable leaves as the SERS active substrate is difficult to control, and the uniformity of the SERS signal and reproducibility are also difficult to be guaranteed, so it is difficult to achieve quantitative or semi-quantitative detection; secondly, the detected SERS spectrum has obvious background interference signals, which is not conducive to the qualitative detection of low-concentration pesticide residues; thirdly, the detection process is too It is cumbersome and difficult to quickly detect pesticide trace residues in vegetables

Method used

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  • Silver nanoparticles-assembled monolayer inverse opal structure, and preparation method and use thereof
  • Silver nanoparticles-assembled monolayer inverse opal structure, and preparation method and use thereof
  • Silver nanoparticles-assembled monolayer inverse opal structure, and preparation method and use thereof

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Embodiment 1

[0042] The concrete steps of preparation are:

[0043] Step 1, first synthesize a single layer of colloidal crystals with colloidal spheres with a particle size of 100nm on the substrate, and then place them at 105°C for 10 minutes; wherein, the colloidal spheres are polystyrene colloidal spheres, and the conductive substrate is indium tin oxide A glass substrate was obtained on which a single-layer colloidal crystal template was placed. Then, after filling 0.1mol / L aluminum nitrate aqueous solution between the colloidal spheres forming the single-layer colloidal crystal template, place it at 105°C for 70 minutes; wherein, the filling is dropwise, and the single-layer colloidal crystal template is sequentially placed on it. and aluminum nitrate substrate.

[0044] Step 2, first use chemical or physical methods to remove the single-layer colloidal crystal template on the substrate on which the single-layer colloidal crystal template and aluminum nitrate are placed sequentially, ...

Embodiment 2

[0047] The concrete steps of preparation are:

[0048] Step 1, first synthesize a single layer of colloidal crystals with colloidal spheres with a particle size of 500nm on the substrate, and then place them at 110°C for 9 minutes; wherein, the colloidal spheres are polystyrene colloidal spheres, and the conductive substrate is indium tin oxide A glass substrate was obtained on which a single-layer colloidal crystal template was placed. After filling the colloidal spheres forming the single-layer colloidal crystal template with 0.15mol / L aluminum nitrate aqueous solution, place it at 110°C for 65 minutes; wherein, the filling is dropwise, and the single-layer colloidal crystal template is sequentially placed on it. and aluminum nitrate substrate.

[0049] Step 2, first use chemical or physical methods to remove the single-layer colloidal crystal template on the substrate on which the single-layer colloidal crystal template and aluminum nitrate are placed sequentially, and the...

Embodiment 3

[0052] The concrete steps of preparation are:

[0053] Step 1, first synthesize a single layer of colloidal crystals with colloidal spheres with a particle size of 2 μm on the substrate, and then place them at 115°C for 8 minutes; wherein, the colloidal spheres are polystyrene colloidal spheres, and the conductive substrate is indium tin oxide A glass substrate was obtained on which a single-layer colloidal crystal template was placed. Then, after filling 0.2mol / L aluminum nitrate aqueous solution between the colloidal spheres forming the single-layer colloidal crystal template, place it at 115°C for 60 minutes; among them, the filling is dropwise, and the single-layer colloidal crystal template is sequentially placed on it. and aluminum nitrate substrate.

[0054] Step 2, first use chemical or physical methods to remove the single-layer colloidal crystal template on the substrate on which the single-layer colloidal crystal template and aluminum nitrate are placed sequentiall...

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Abstract

The invention discloses a silver nanoparticles-assembled monolayer inverse opal structure, and a preparation method and a use thereof. The structure is a rod-shaped substance composed of an alumina hemispherical shell, a gold film and silver nanoparticls which are sequentially coated on a substrate, wherein the substrate is a conductive substrate, the diameter of the alumina hemispherical shell is 100 nm to 10 [mu]m, the thickness of the spherical shell is 50-500 nm, the thickness of the gold film is more than or equal to 5 nm, the thickness of the gold nanoparticles is 10-30 nm, and the rod-shaped substance is a hemispherical-bottomed strip formed by serially connecting the silver nanoparticles and a hemispherical-shelled rod formed by accumulating the silver nanoparticles and having two tapered ends. The method comprises the following steps: synthesizing a single layer of colloidal crystals on the substrate, filling gaps among the colloidal spheres with an aqueous solution of aluminum nitrate, using a chemical or physical technology to remove the monolayer colloidal crystal template, annealing the obtained material, coating the annealed material with the gold film, and carrying out electrodeposition in a silver electrolyte by using the coated material as a cathode and a graphite sheet as an anode to prepare the target product. The product has a stable structure, and can be easily and commercially widely applied to the rapid detection of a tiny amount of pesticide residues in vegetables.

Description

technical field [0001] The invention relates to an inverse opal structure, its preparation method and application, in particular to a single-layer inverse opal structure assembled with silver nanoparticles and its preparation method and application. Background technique [0002] Surface-enhanced Raman scattering (SERS) spectroscopy has the advantages of high sensitivity and providing molecular spectral fingerprint information, and has a wide range of applications in chemical analysis, environmental monitoring, and food safety testing. Recently, people have made some useful attempts in order to detect pesticide residues on vegetable leaves, such as entitled "Engineering Natural Materials as Surface-Enhanced Raman Spectroscopy Substrates for In situ Molecular Sensing", ACSAppl.Mater.Interfaces, 2012, 4, 6599 -Article 6608 ("Designing natural materials as SERS substrates for in situ molecular detection", American Chemical Society Applied Materials and Interfaces, Vol. 4, 2012, ...

Claims

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Application Information

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IPC IPC(8): G01N21/65C25D15/00C25D3/46C25D5/54B82Y40/00
CPCB82Y40/00C25D3/46C25D5/54C25D15/00G01N21/65G01N21/658G01N2021/655
Inventor 朱储红孟国文
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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