Fluorescent enhancement nano thin film and preparation method thereof

A technology of fluorescence enhancement and nano-film, applied in the field of fluorescence-enhanced nano-film and its preparation, can solve the problems of unsuitability for large-scale production, uncontrollable shape, distance, complicated equipment, etc. The effect of limited and short process time

Inactive Publication Date: 2016-06-15
DONGHUA UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The invention overcomes the defects of the prior art in the preparation method of the metal nanoparticle film on the substrate. For example, in the method of vacuum evaporation, the equipment is complicated, the work efficiency is low, and the disadvantages such as limited substrate size are not suitable for large-scale production. The technical method is complex in process and is not suitable for preparing surfaces with a distance of only a few nanometers. The self-assembly technology takes a long time to process, and the nanoparticles deposited on the treated substrate have the disadvantages of uncontrollable shape and distance. Fluorescence enhanced nano film and preparation method thereof

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  • Fluorescent enhancement nano thin film and preparation method thereof
  • Fluorescent enhancement nano thin film and preparation method thereof
  • Fluorescent enhancement nano thin film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] (1) Preparation of gold nanoparticles

[0045] Gold nanoparticles with a diameter of about 13nm are obtained by reducing chloroauric acid with sodium citrate. The specific method is as follows: 200mL of 1mM HAuCl 4 Heat 3H2O to boiling under vigorous stirring, quickly add 20mL of 38.8mM sodium citrate solution, continue stirring, keep boiling for half an hour, take out the solution and stir to cool to room temperature, and store the synthesized gold nanoparticles in the dark in a refrigerator at around 4°C.

[0046] (2) Pretreatment of quartz substrate

[0047] Sonicate with toluene, acetone, chloroform, ethanol and deionized water for 10 minutes respectively to remove various impurities attached to the surface of the substrate, and then in a mixed solution of 98% sulfuric acid and 30% hydrogen peroxide (v:v=7:3) Heat and boil for 20 minutes until no bubbles overflow. Rinse with a large amount of distilled water after cooling, then blow dry with nitrogen, and set as...

Embodiment 2

[0053] In this embodiment, the spraying pressure is 10 psi, and the other control conditions of the experiment are the same as in Embodiment 1, and a gold nano film is prepared.

Embodiment 3

[0055] In this embodiment, the spraying pressure is 50 psi, and the other control conditions of the experiment are the same as in Embodiment 1, and a gold nano film is prepared.

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Abstract

The invention discloses a fluorescent enhancement nano thin film and a preparation method thereof. The preparation method includes the steps of: 1) pre-treating a substrate to enable the surface of the substrate to be charged, and then forming a single-layer or a multi-layer film, of which the surface has positive charges, on the substrate; and 2) spray-coating the surface of the single-layer or a multi-layer film with metal nano particles, removing physical adsorption, and blow-drying the material. The spray-coating pressure is 5-60 psi, the spraying time is 2-30 s, and the distance between a nozzle of a spray gun for spray coating and the substrate is 10-30 cm. The preparation method is simple, is short in time consumption, is free of limit on substrate size and is suitable for large-scale production. The nano particles are sprayed onto the pre-treated substrate through spray coating to form the thin film with appearance and distance of metal nano particles being adjustable.

Description

technical field [0001] The invention relates to a fluorescence enhancing nano film and a preparation method thereof. Background technique [0002] Metal nanoparticles have a unique surface plasmon resonance effect, which is the result of the interaction between incident light and free electrons of gold nanoparticles. When the wavelength of incident light resonantly couples with the vibration frequency of free electrons, free electrons will be induced Collective oscillations, resulting in the surface plasmon resonance effect. This resonance effect makes the local electromagnetic field around metal particles significantly enhanced. This near-field enhanced effect is widely used in the amplification of near-field signals, such as surface-enhanced fluorescence, surface-enhanced Raman scattering, surface-enhanced absorption, transmission, etc. [0003] At present, fluorescence analysis has the advantages of high sensitivity, strong selectivity, less sample amount required, and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/36C04B41/52
Inventor 马莹刘盼盼周颖邱夷平
Owner DONGHUA UNIV
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