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A kind of porous gold-silver alloy nanomaterial and its preparation method and application

A nanomaterial and silver alloy technology, applied in metal material coating process, nanotechnology, nanotechnology and other directions, can solve the problems of high preparation cost, hinder the adsorption of target molecules, complex preparation method, etc., and achieve low preparation cost and excellent surface. The effect of enhancing Raman scattering performance and simple preparation method

Active Publication Date: 2019-05-31
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In order to solve the technical problems such as the complex preparation method of the existing porous gold-silver alloy nanomaterials, the high preparation cost and the need to use end-capping agents or stabilizers in the preparation process, which hinder the adsorption of target molecules, the present invention provides a porous Gold-silver alloy nanomaterial and its preparation method and application

Method used

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  • A kind of porous gold-silver alloy nanomaterial and its preparation method and application
  • A kind of porous gold-silver alloy nanomaterial and its preparation method and application
  • A kind of porous gold-silver alloy nanomaterial and its preparation method and application

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preparation example Construction

[0033] Specifically, the preparation method of the porous gold-silver alloy nanomaterial may include the following steps:

[0034]Step A, using a single-layer colloidal microsphere array with a colloidal microsphere diameter of 350-750 nm as a template, and using a physical deposition method to deposit a layer of gold film on the surface of the template, and then removing the single-layer colloidal microsphere array by heat treatment, Thereby, an ordered array of gold nanospheres is prepared.

[0035] Further: the specific implementation process of step A can include the following steps:

[0036] (1) Step A1, put the substrate into ethanol and deionized water successively for ultrasonic cleaning, ultrasonic cleaning is carried out in each liquid for 20 to 60 min, and then the cleaned substrate is dried (for example: can be placed in an oven to Drying at 60°C for 20min), and then placed in a UV-ozone cleaner for 20-60min irradiation to obtain a substrate with a hydrophilic sur...

Embodiment 1

[0054] like Figure 10 As shown, a porous gold-silver alloy nanomaterial, the preparation method of which comprises the following steps:

[0055] Step a. Put the two substrates, the glass slide and the silicon wafer, into acetone, ethanol, and deionized water for ultrasonic cleaning in turn. Ultrasonic cleaning is carried out in each liquid for 20-60 minutes, and then the cleaned glass slide and silicon wafer are cleaned. Put them in an oven to dry at 60°C for 20 minutes, and then place the dried glass slides and silicon wafers in an ultraviolet-ozone cleaning machine for 20-60 minutes to obtain a glass slide substrate and a silicon wafer substrate with hydrophilic surfaces.

[0056] Step b. Take 40 mL of polystyrene colloidal microsphere suspension (2.5 wt.%) with a diameter of 350-750 nm of colloidal microspheres, mix it with an equal volume of ethanol, and then perform ultrasonic dispersion for 10-30 minutes to obtain a dispersion Uniform colloidal microsphere diameter is ...

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Abstract

The invention discloses a porous gold-silver alloy nanomaterial and its preparation method and application. The material is an ordered array of hexagonal non-close-packed porous gold-silver alloy nanospheres with a period of 350-750nm. The preparation method of the material includes: using a single-layer colloidal microsphere array as a template, depositing a layer of gold film on the surface of the template by a physical deposition method, and then performing heat treatment to obtain an ordered array of gold nanospheres; A layer of silver film is deposited on the surface of the ordered array of gold nanospheres, and then heated and annealed to obtain an ordered array of gold-silver alloy nanospheres; the ordered array of gold-silver alloy nanospheres is chemically etched, thereby That is, the porous gold-silver alloy nanomaterial is obtained. The invention not only can prepare a large-area hexagonal non-close-packed porous gold-silver alloy nanosphere ordered array with controllable period and size, but also requires no capping agent and stabilizer, is easy to adsorb target molecules, and is convenient for repeated use.

Description

technical field [0001] The invention relates to the field of gold-silver alloy nanomaterials, in particular to a porous gold-silver alloy nanomaterial and its preparation method and application. Background technique [0002] Gold-silver alloy nanomaterials have localized surface plasmon resonance characteristics, which can produce a strong electromagnetic field enhancement effect, and can be widely used in analysis and detection based on surface-enhanced Raman scattering. Since the sensitivity of surface-enhanced Raman scattering mainly depends on the "hot spots" where the electromagnetic field is greatly enhanced in nanomaterials, people have prepared gold-silver alloy nanomaterials with structures such as rough surfaces, tips, and corners, but these have The sensitivity of surface-enhanced Raman scattering of high-density "hot spot" gold-silver alloy nanomaterials is not ideal in practical applications. Compared with gold-silver alloy nanomaterials with other structures, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/12C23C14/22G01N21/65B82Y30/00B82Y40/00
CPCG01N21/65C23C14/223B82Y30/00B82Y40/00B22F9/12B22F1/07B22F1/145B22F1/054
Inventor 李越张涛孙一强杭立峰门丹丹
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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