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Preparation method of hollow Ag-Au alloy complex structure micro-nano array

A composite structure and alloy technology, applied in nanotechnology, nanotechnology, metal material coating technology and other directions, can solve the problems of easy aggregation of nanoparticles, affecting the detection effect, difficult to control the gap, etc., to achieve simple and feasible operation, uniform array arrangement , the effect of structural stability

Active Publication Date: 2018-07-13
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The Ag / Au composite structure in the prior art is mostly obtained by using Ag sol through replacement reaction. Due to the random distribution of nanoparticles, the gap is difficult to control, and the consistency of detection is poor.
At the same time, because the nanoparticles are easy to aggregate, which affects the detection effect

Method used

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  • Preparation method of hollow Ag-Au alloy complex structure micro-nano array
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  • Preparation method of hollow Ag-Au alloy complex structure micro-nano array

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A method for preparing a hollow Ag-Au alloy composite structure micro-nano array, comprising the following steps:

[0047] S1: Prepare an ordered PS single-layer colloidal sphere template based on Au / ITO to obtain a PS / Au / ITO substrate;

[0048] S1-1: Coating a 10nm-thick Au film on ITO glass with an ion sputtering coater; sputtering current 20mA, time 90s;

[0049] S1-2: Obtain a periodic and ordered PS single-layer colloidal sphere template with a centimeter-scale large area on a glass sheet through the gas-liquid interface self-assembly method, and the diameter of the PS is 1000nm;

[0050] S1-3: Transfer the prepared PS monolayer colloidal spheres onto the Au / ITO substrate as a whole by the suspension method, and after drying naturally, heat them in an oven at 110°C for 5 minutes to make the PSs spheres firmly adhere to the Au / ITO on the base;

[0051] S1-4: PS / Au / ITO substrate cut into 1cm×3cm.

[0052] S2: Composite Ag film on the PS / Au / ITO substrate obtained i...

Embodiment 2

[0066] The hollow Ag-Au alloy composite structure micro-nano array sample obtained in Example 1 was used as the SERS substrate, and its detection performance for melamine solution was tested.

[0067] Raman spectra were collected by a confocal Raman spectrometer (Renishaw inVia Reflex). Acquisition conditions: 785nm wavelength, power 2mW, 50x microscope to focus the laser beam on the sample to form a spot with a diameter of about 2μm. The spectrum acquisition time is 10s. Before Raman spectrum detection, the prepared SERS substrate samples were soaked in melamine solution for 2 h to ensure that melamine was fully adsorbed on the samples. Then it was washed with deionized water to remove excess melamine molecules, and measured after air drying.

[0068] Firstly, BPHAN arrays with different etching times (i.e. different Ag-Au ratios) were tested against concentrations of 10 -5 The SERS spectral signal of M concentration, such as Figure 4 (a) shown. It can be seen from the ...

Embodiment 3

[0071] In order to clearly understand the physical mechanism of SERS enhancement of hollow Ag-Au alloy composite structure micro-nano arrays, the present invention analyzes the local electric field characteristics of three kinds of bowl-like structure arrays. Parameter setting: The maximum diameter of the mouth of the bowl is 976nm, the period is 1000nm, and it has a hexagonal close-packed structure. The parameters come from image 3 The observation results of the SEM image in the middle; three bowl-shaped structures using three different materials, namely gold, silver, and Ag 0.5 Au 0.5 alloy, wherein the dielectric constant of the Ag-Au alloy material is obtained by using the equivalent dielectric constant. The light source whose polarization direction of the electric field is along the x-axis is incident vertically on the surface, and the wavelength of the light source is 785nm of the pump light of the Raman spectrum.

[0072] Figure 6 They are Au, Ag, and Ag 0.5 Au 0...

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Abstract

The invention discloses a preparation method of a hollow Ag-Au alloy complex structure micro-nano array. A silver bowl array prepared on the basis of a PS monolayer crystal colloid temperature and theelectro-deposition technology serves as a secondary template; a bowl hole type array composed of Ag-Au alloy nano-particles is obtained through the chloroauric acid corrosion process, and high-sensitivity detection of 10-9M melamine is achieved. Through electric field distribution of a FDTD software simulating calaculation structure, the simulation result is basically matched with the experimental result. As a result, an Ag-Au BPAN array at the proper Ag-Au ratio has good SERS properties indeed, and the sensitivity and the peak response intensity of the hollow Ag-Au alloy complex structure micro-nano array are much better than those of an existing structure.

Description

technical field [0001] The invention relates to a method for preparing a hollow Ag-Au alloy composite structure micro-nano array. Background technique [0002] Surface-enhanced Raman scattering (Surface-enhanced Raman scattering, SERS) has been widely used in ultrasensitive detection in the fields of chemistry and biology because it can provide molecular-level information of detection substances on SERS active substrates. Noble metal nanostructures, especially Ag and Au nanostructures, have shown excellent SERS activity due to unique localized surface plasmon resonance (LSPR) properties. However, Ag nanostructures are easily oxidized and have poor stability. In contrast, Au nanostructures are stable but at least an order of magnitude lower in sensitivity than Ag nanostructures. Therefore, using the Ag-Au composite structure as a SERS substrate will not only take advantage of the stability of Au but also maintain the sensitivity of Ag, which is suitable for the detection of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/44C25D3/46B82Y30/00B82Y40/00G01N21/65
CPCB82Y30/00B82Y40/00C23C18/44C25D3/46G01N21/658
Inventor 石辰熙聂彬彬段兰茜申国庆陈孟磊李亚茹石建平
Owner ANHUI NORMAL UNIV
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