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Three-dimensional arrangement nanoparticle film array structure and preparation method and application thereof

A nanoparticle and array structure technology, applied in the field of nanophotonics, can solve the problems of unable to excite surface lattice resonance, unable to generate coupling, affecting the improvement of surface lattice resonance quality factor, etc.

Active Publication Date: 2021-07-30
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The existing "bottom-up" interfacial self-assembly method has been able to prepare planar close-packed nanoparticle films. However, the period of this system is on the same order as the size of the nanoparticles, and the local resonance of the nanoparticles cannot be coupled with the Rayleigh anomaly of the array. , so the surface lattice resonance cannot be excited
Combined with physical etching of planar periodic hole templates, two-dimensional nanoparticle array structures can be self-assembled. By adjusting the hole template period, the local resonance of nanoparticles can be coupled with the Rayleigh anomaly of the array, thereby exciting the surface lattice resonance. However, in this method, the template hole size is generally larger than the nanoparticle size, which causes certain uncertainty in the position of the nanoparticle, and it is difficult to form an array structure with a consistent period, which affects the improvement of the quality factor of the formed surface lattice resonance.

Method used

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  • Three-dimensional arrangement nanoparticle film array structure and preparation method and application thereof
  • Three-dimensional arrangement nanoparticle film array structure and preparation method and application thereof
  • Three-dimensional arrangement nanoparticle film array structure and preparation method and application thereof

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preparation example Construction

[0037] The invention provides a method for preparing a three-dimensionally arranged nanoparticle film array structure, comprising the following steps:

[0038] (1) The nanoparticles are coated with hydrophobic molecules and then dispersed in an organic solvent to obtain a modified nanoparticle dispersion;

[0039] (2) surface-treating the three-dimensional template to obtain a hydrophilic three-dimensional template;

[0040] (3) adding water to the surface of the hydrophilic three-dimensional template to form a water film, adding the modified nanoparticle dispersion dropwise to the surface of the water film for self-assembly, and then removing the water film to obtain A three-dimensional nanoparticle film array structure arranged along a three-dimensional template;

[0041] Step (1) and step (2) are not in chronological order.

[0042] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those ski...

Embodiment 1

[0073] (1) Place gold nanosphere particles with a diameter of 35nm in water to obtain a dispersion of gold nanosphere particles with a concentration of 0.5 mg / mL; under a nitrogen environment, add 4 mg of thiolated polystyrene to 4 mL with stirring In tetrahydrofuran, a thiolated polystyrene solution was obtained; at room temperature and at a stirring speed of 500 r / min, 100 μL of gold nanosphere particle dispersion was added dropwise to the thiolated polystyrene solution, and left to stand for 12 hours. The obtained solid product was centrifuged and washed twice with chloroform at a speed of 4000 r / min to obtain modified nanoparticles;

[0074] (2) Dispersing the coated nanoparticles in chloroform to obtain a modified nanoparticle dispersion with a concentration of 30 mg / mL;

[0075] (3) Mix the PDMS prepolymer and the curing agent according to the mass ratio of 10:1, stir well and pour it into the glass fixture template, and then cure it in an oven at 80°C for 5 hours, and t...

Embodiment 2

[0084] According to the method of Example 1, a three-dimensionally arranged nanoparticle film array structure is prepared. The difference from Example 1 is that the three-dimensional template is a polystyrene wrinkled template;

[0085] The preparation of the polystyrene wrinkled template is as follows: ultrasonically treat the PS nanosphere water suspension with a particle size of 800 μm and a concentration of 2.5% w.t for 10 minutes, and mix the PS nanosphere water suspension with ethanol at a volume ratio of 1:1 Mix to obtain the PS nanosphere mixture; place the substrate on the bottom of the culture dish filled with deionized water, and then use the syringe pump to slowly inject the PS nanosphere mixture into the surface of the deionized water in the culture dish at a rate of 8 μL / min, so that The PS nanospheres are spread on the air / water interface, and then the deionized water is pumped out using a syringe pump, and the PS nanosphere monolayer film slowly falls on the sur...

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Abstract

The invention provides a three-dimensional arrangement nanoparticle film array structure and a preparation method and an application thereof and belongs to the technical field of nano photonics. The preparation method comprises the following steps of coating nano-particles with hydrophobic molecules, and dispersing the coated nano-particles in an organic solvent to obtain a modified nano-particle dispersion liquid; carrying out surface treatment on the three-dimensional template to obtain a hydrophilic three-dimensional template; and adding the water to the surface of the hydrophilic three-dimensional template to form a water film, dropwise adding the modified nanoparticle dispersion liquid to the surface of the water film for self-assembly, and then removing the water film to obtain the three-dimensionally arranged nanoparticle film array structure. The three-dimensional array structure prepared by a self-assembly-template auxiliary method can generate vertical and parallel multi-surface lattice resonance, effectively inhibit radiation loss, enhance interaction between nanoscale light and substances, and have good application prospects in enhancement of nonlinear effect, biosensing, nano laser or enhancement of fluorescence; and the preparation method is good in universality, simple to operate and low in cost.

Description

technical field [0001] The invention relates to the technical field of nanophotonics, in particular to a three-dimensionally arranged nanoparticle film array structure and a preparation method and application thereof. Background technique [0002] The surface lattice resonance based on nanoparticle arrays can effectively suppress the radiation loss at the resonance mode, thereby enhancing the interaction between light and matter at the nanoscale, and is widely used in the fields of enhancing nonlinear effects, biosensing, nanolaser or enhanced fluorescence. In order to generate surface lattice resonance, a planar two-dimensional nanoparticle array structure is generally used, and its preparation methods are mainly divided into two methods: "top-down" and "bottom-up". "Top-down" technology is to use electron beam etching, ion beam etching, photolithography and other physical etching techniques to prepare nanostructures. The nanostructures obtained by this method are accurate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00G02F1/355
CPCG02B1/002G02F1/355B05D1/185B05D1/20B05D2201/00B05D3/101B05D3/144B05D5/06B05D5/08
Inventor 刘绍鼎耿伟岳鹏廉岚淇虞应
Owner TAIYUAN UNIV OF TECH
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