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Silver nanosheet cluster array and preparation method and application thereof

A technology of silver nanosheets and arrays, which is applied in the field of silver nanomaterials and preparation, can solve the problems that it is difficult to realize the controllable adjustment of the LSPR absorption peak of the silver nanosheet structure, it is not conducive to the repeatability of SERS signals, and the preparation method cannot be overcome, etc., to achieve SERS High hotspot density, simple and easy method, and high reproducibility

Pending Publication Date: 2022-01-21
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the density of silver nanosheets prepared by this method needs to be further improved, because within a unit area, high-density silver nanosheets will generate more SERS hotspots and obtain higher SERS detection sensitivity.
In addition, the vertical silver nanosheet structure prepared by this method is not an ordered array, which is not conducive to obtaining good SERS signal repeatability
This method is also difficult to control the LSPR absorption peak of the prepared silver nanosheet structure.
In addition, the preparation method cannot overcome the above-mentioned shortcomings

Method used

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  • Silver nanosheet cluster array and preparation method and application thereof
  • Silver nanosheet cluster array and preparation method and application thereof
  • Silver nanosheet cluster array and preparation method and application thereof

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Embodiment 1

[0038] This embodiment provides a method for preparing a silver nanosheet cluster array, the specific steps are:

[0039] Step 1: Use the liquid surface self-assembly method to obtain a single-layer close-packed microsphere array template composed of polystyrene microspheres with a diameter of 2 microns, and then use the liquid surface floating method to transfer the single-layer polystyrene bead template to the surface by The ion sputtering method sputters the conductive substrate surface with gold nanoparticles;

[0040]Step 2: Put the conductive substrate sputtered with gold nanoparticles on the surface and laying a single layer of polystyrene beads in an oven with an internal temperature of 110°C for 10 minutes, so that the polystyrene beads are firmly attached to the conductive substrate surface, and the adjacent polystyrene balls are connected to each other; then the conductive substrate is taken out, and an aqueous solution of aluminum nitrate with a concentration of 0....

Embodiment 2

[0046] This embodiment provides a method for preparing a silver nanosheet cluster array, the specific steps are:

[0047] Step 1: Use the liquid surface self-assembly method to obtain a single-layer close-packed microsphere array template composed of polystyrene microspheres with a diameter of 2 microns, and then use the liquid surface floating method to transfer the single-layer polystyrene bead template to the surface by The ion sputtering method sputters the conductive substrate surface with gold nanoparticles;

[0048] Step 2: Put the conductive substrate sputtered with gold nanoparticles on the surface and laying a single layer of polystyrene beads in an oven with an internal temperature of 110°C for 10 minutes, so that the polystyrene beads are firmly attached to the conductive substrate surface, and adjacent polystyrene spheres are connected to each other; then the conductive substrate covered with polystyrene microsphere arrays is placed in a plasma etching machine, an...

Embodiment 3

[0053] This embodiment provides a method for preparing a silver nanosheet cluster array, the specific steps are:

[0054] Step 1: Use the liquid surface self-assembly method to obtain a single-layer close-packed microsphere array template composed of polystyrene microspheres with a diameter of 2.5 microns, and then use the liquid surface floating method to transfer the single-layer polystyrene bead template to the surface by The ion sputtering method sputters the conductive substrate surface with gold nanoparticles;

[0055] Step 2: Put the conductive substrate sputtered with gold nanoparticles on the surface and laying a single layer of polystyrene beads in an oven with an internal temperature of 110°C for 10 minutes, so that the polystyrene beads are firmly attached to the conductive substrate surface, and adjacent polystyrene spheres are connected to each other; then the conductive substrate covered with polystyrene microsphere arrays is placed in a plasma etching machine, ...

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Abstract

The invention discloses a silver nanosheet cluster array and a preparation method and application thereof. The array is composed of silver nanosheet cluster units which are located on the surface of a conductive substrate and located in holes of a porous aluminum oxide film, adjacent micron holes are communicated, and the hole walls of the adjacent micron holes are enclosed to form a spherical cavity; and silver nanosheet clusters are composed of silver nanosheets which vertically grow on the surface of the conductive substrate and are located in aluminum oxide holes. The preparation method comprises the following steps: sputtering gold particles on the conductive substrate, then laying single-layer orderly densely-arranged polystyrene microspheres on the gold particles, filling gaps of the polystyrene microspheres with a high-concentration aluminum nitrate solution, heating and decomposing aluminum nitrate to form the aluminum oxide porous film, removing a polystyrene microsphere array and electrically depositing the silver nanosheet cluster array in the aluminum oxide holes. The array can be used as an active substrate of SERS to measure trace organic matters attached to the active substrate, rhodamine 6G with the concentration as low as 10 <-15 > mol / L can be detected, and the signal uniformity and the detection sensitivity are high.

Description

technical field [0001] The invention relates to a silver nano material and its preparation method and use, in particular to a silver nano sheet cluster array and its preparation method and use. Background technique [0002] Surface-enhanced Raman scattering (SERS) spectroscopy has broad application prospects in the detection of organic molecules and ions. The local surface plasmon resonances (LSPR) light absorption peak of silver nanosheets can be adjusted in the range of 400-1000nm, which can be suitable for a variety of excitation wavelengths, and the edges of silver nanosheets can generate local electromagnetic field hotspots (hot spots), the gap between sheets can also generate hot spots, so it has a significant advantage in the construction of SERS substrates. For example, published in 2010 in "Journal of Materials Chemistry" Vol. 10, pp. 767–772 (J. Mater. Chem., 2010, 20, 767–772), entitled "Vertically cross-linking silver nanoplate arrays with controllable density b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/18C23C14/34C23C14/35C25D3/46C25D5/02C25D5/54G01N21/65B82Y40/00
CPCC23C14/35C23C14/34C23C14/185C25D5/02C25D5/54C25D3/46G01N21/658B82Y40/00
Inventor 杜海威翟海超刘丹严满清徐更生李村袁玉鹏朱储红
Owner ANHUI UNIVERSITY
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