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SERS substrate based on Au @ Ag nanoparticle ordered array as well as preparation method and application thereof

An ordered array and nanoparticle technology, applied in the field of SERS substrate materials, can solve the problems of difficulty in obtaining large-area regular and ordered array morphology, limiting the application of nanomaterials, and poor SERS enhancement effects, etc., to achieve increased uniformity and The effect of stability, firm combination, and high stability detection

Inactive Publication Date: 2019-11-08
JIANGXI SCI & TECH NORMAL UNIV
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Problems solved by technology

However, these methods either require special electrochemical equipment, or it is difficult to obtain a large-area regular and ordered array morphology, or the surface of the prepared Ag nanosheets is relatively smooth, resulting in poor SERS enhancement effect. There are great limitations in the process and morphology of sheet arrays, which largely limit the application of this nanomaterial in SERS substrates.

Method used

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  • SERS substrate based on Au @ Ag nanoparticle ordered array as well as preparation method and application thereof
  • SERS substrate based on Au @ Ag nanoparticle ordered array as well as preparation method and application thereof
  • SERS substrate based on Au @ Ag nanoparticle ordered array as well as preparation method and application thereof

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preparation example Construction

[0027] A method for preparing a SERS substrate based on an ordered array of Au@Ag nanoparticles may include the following steps:

[0028] Step A, preparing a silicon wafer-based single-layer polymer colloidal crystal array, and using the silicon wafer-based single-layer polymer colloidal crystal array as a template, depositing a layer with a thickness of 20 to 40 nm on the surface of the template by using a physical deposition method Au film.

[0029] Step B. Thermally decompose and anneal the template deposited with the Au film to remove the single-layer polymer colloidal crystal array, and at the same time melt, fuse and solidify the Au film in situ, thereby preparing silicon wafer-based two-dimensional Au nanoparticles array.

[0030] Step C, placing the silicon chip-based two-dimensional Au nanoparticle array face up in a citrate buffer solution, then adding 0.1 mol / L silver nitrate solution, and reacting at room temperature for 20 to 30 minutes under dark conditions, Th...

Embodiment 1

[0046] like Image 6 As shown, a SERS substrate based on an ordered array of Au@Ag nanoparticles, its preparation method may include the following steps:

[0047] Step a, using the gas-liquid interface self-assembly method to prepare a silicon wafer-based single-layer polystyrene colloidal sphere array, and using the silicon wafer-based single-layer polystyrene colloidal sphere array as a template, using a magnetron sputtering deposition method (the processing electric current of magnetron sputtering deposition is 20mA, and processing time is 3~5min, and the gold content of the gold target material used in magnetron sputtering deposition is 99.99%) Deposit a layer thickness on the surface of described template to be 20~5min. 40nm Au film.

[0048] Step b. Put the template deposited with the Au film into a tube furnace, and anneal it in an air atmosphere at 900-1000°C for 2 hours, so that the single-layer polymer colloidal crystal array is thermally decomposed, and at the same...

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Abstract

The invention discloses an SERS substrate based on an Au @ Ag nanoparticle ordered array as well as a preparation method and application thereof. The preparation method comprises the following steps that firstly, a two-dimensional Au nanoparticle array is prepared; then the two-dimensional Au nanoparticle array is put into a citrate buffer solution, and then a silver nitrate solution with the concentration being 0.1mol / L is added, reaction is carried out for 20-30 minutes under a room-temperature dark condition, and then cleaning is carried out to prepare the Au @ Ag nanoparticle ordered array; and finally, the Au @ Ag nanoparticle ordered array is placed into a potassium iodide solution with the concentration being 1 mmol / L to prepare the SERS substrate based on the Au @ Ag nanoparticle ordered array. According to the SERS substrate, the preparation method and the application, a Ag nanosheet is not only enable to have a sharp corner and a rough surface, but also an SERS signal can beremarkably enhanced, the large-area morphology of the nanoparticle array has the orderliness and regularity, and the uniformity and stability of the SERS signal are improved.

Description

technical field [0001] The present invention relates to the field of SERS (Surface-Enhanced Raman Scattering, Surface-Enhanced Raman Scattering) substrate materials, in particular to a SERS substrate based on an ordered array of Au@Ag nanoparticles and its preparation method and application. Background technique [0002] The use of various biochemical reagents such as pesticides and food additives, while providing convenience to human production and life, has also brought a series of environmental problems and even threatened human health; for example: thiram as a widely used pesticide molecule , can be used to prevent crop diseases and insect pests and preservatives in the process of transportation and storage of fruits and vegetables, but excessive use of thiram will pollute soil and water sources. If people eat fruits and vegetables containing thiram, it will cause various serious physical diseases, such as dyspnea, cerebellar ataxia, fetal malformation and convulsions. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/04C23C14/16C23C14/58C23C18/44G01N21/65B82Y40/00
CPCB82Y40/00C23C14/042C23C14/16C23C14/5806C23C18/44G01N21/658
Inventor 门丹丹向军淮张洪华黄隆
Owner JIANGXI SCI & TECH NORMAL UNIV
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