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Al/Ag layered nanostructured large-area SERS substrate, preparation method and application

A layered nanotechnology, large-area technology, applied in measurement devices, instruments, material analysis by optical means, etc., can solve the problems of long preparation period, complex process, small size, etc., achieve direct detection, overcome the complex preparation process , Overcome the effect of small size

Inactive Publication Date: 2019-08-16
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems existing in the prior art, the present invention provides a method for preparing a large-area SERS substrate with an Al / Ag layered nanostructure, which overcomes the problems of complex process, long preparation period and small size of the existing SERS substrate preparation method , and the substrate prepared by this method is applied to the detection of melamine, realizing the direct detection of melamine

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  • Al/Ag layered nanostructured large-area SERS substrate, preparation method and application
  • Al/Ag layered nanostructured large-area SERS substrate, preparation method and application
  • Al/Ag layered nanostructured large-area SERS substrate, preparation method and application

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Embodiment 1

[0031] The present invention will be further described in conjunction with the accompanying drawings.

[0032] A kind of preparation method of the SERS substrate of Al / Ag layered nanostructure, comprises the following steps:

[0033] (1) Put the monocrystalline silicon wafer (5cm×5cm) into acetone, absolute ethanol, and deionized water for 5 minutes to ultrasonically clean it, and use N 2 Blow off the moisture on the surface of the silicon wafer, let it dry naturally, put the silicon wafer on the heating plate, heat at 90°C for 30 minutes, and dry the moisture. The tungsten wire used in the evaporation process and the Al wire with a purity of 99.99% were placed in absolute ethanol and ultrasonically cleaned for 10 min.

[0034](2) Stick the above-mentioned monocrystalline silicon wafer after drying on the substrate table of the vacuum evaporation equipment with vacuum tape, put it into the vacuum chamber, and evacuate to 1.0×10 -4 Pa, slowly apply current to the tungsten wir...

Embodiment 2

[0039] Application of a SERS substrate with Al / Ag layered nanostructure

[0040] The application of the SERS substrate of the described a kind of Al / Ag layered nanostructure is to the detection of melamine, when carrying out the analog sample SERS detection, comprises the following steps:

[0041] Use a pipette gun to draw a mass concentration of 10 -3 M-10 -7 5 ul of each melamine solution of M was dropped on the surface of the substrate prepared in Example 1.

[0042] After the droplets on the surface of the substrate are naturally dried, use a Raman spectrometer to directly perform Raman detection on the area with the droplets. The parameters of the Raman spectrometer are the same as in Example 1, and the detection results are as follows: Figure 7 As shown, it can be seen from the figure that at the characteristic peak position 681cm -1 , the Raman signal of melamine increases with the increase of melamine concentration, even when the concentration of melamine drops to ...

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Abstract

The invention provides an Al / Ag layered nanostructured large-area SERS substrate, a preparation method and application. The method can prepare a large-area SERS substrate with high density of hot spots. A monocrystalline silicon wafer, as a substrate, undergoes ultrasonic washing and then is stoved, a uniform cloud-shaped aluminum nanostructure is built on the surface of the monocrystalline silicon wafer by using a vacuum evaporation technology, so as to provide a large quantity of sites for deposition of precious metal nanoparticles, then Ag nanoparticles are deposited on the surface of the aluminum nano layer by using a laser molecular beam epitaxy technology. Measurements prove that detection limit of the SERS substrate prepared by the method for the R6G reaches 10<-9>M. The substrate has high sensitivity and good reproducibility, is easy to manufacture, can be used for directly detecting tripolycyanamide, has lowest detection limit of 10<-7>M, detects rapidly, delivers accurate detection results, and overcomes defects of long detection period and complex detection process of traditional tripolycyanamide detection method, thereby having a bright application prospect.

Description

technical field [0001] The invention relates to a large-area SERS substrate with an Al / Ag layered nanostructure, a preparation method and the detection application of melamine by using the substrate. Background technique [0002] The surface plasmon resonance of plasmonic nanomaterials will generate a strong electromagnetic field under the excitation of incident light, which greatly enhances the Raman signal of the probe molecules attached to the surface of plasmonic nanomaterials. There has been widespread concern in the field of Surface-Enhanced Raman Scattering (SERS) sensors. The SERS phenomenon is that when certain molecules are attached to the surface of plasmonic nanostructures, the Raman spectrum signals of these molecules can be significantly enhanced. It can be detected by vibration fingerprint recognition for trace detection, and it also has high detection sensitivity for single molecules. Because of its fingerprint identification characteristics and high detecti...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 李和福赵楠于会山王文军
Owner LIAOCHENG UNIV