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Surface-enhanced Raman scattering device and its preparation method and application

A technology of surface-enhanced Raman and scattering devices, applied in Raman scattering, material excitation analysis, etc., can solve the problems of limited SERS effect enhancement, non-adjustable distance between gold nanoparticles in active substrates, and inability to obtain active substrates with detection sensitivity. , to achieve the effect of simple preparation method and wide application prospect

Inactive Publication Date: 2015-09-30
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, both the colloid and its preparation method have shortcomings. First, the spacing of gold nanoparticles in the active substrate cannot be adjusted, especially the spacing can not be adjusted to an optimal value of about 10 nanometers, so that it cannot fully Play the role of "hot spots" between gold nanoparticles, so that the enhancement effect of the SERS effect is limited; secondly, the preparation method cannot obtain active substrates with high detection sensitivity

Method used

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  • Surface-enhanced Raman scattering device and its preparation method and application
  • Surface-enhanced Raman scattering device and its preparation method and application
  • Surface-enhanced Raman scattering device and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0043] The concrete steps of preparation are:

[0044] Step 1: Mix poly(N-isopropylacrylamide), gold nanorods and water in a weight ratio of 1.8:0.003:100 to obtain a mixed colloid.

[0045] Step 2, slowly add ammonia water with a concentration of 25wt% to the aqueous solution of zinc nitrate hexahydrate with a concentration of 1.5wt%, until the white precipitate of zinc hydroxide is completely dissolved to obtain an electrodeposition solution. Then, the electric heating wire is used as the cathode, and the graphite is used as the anode, and they are placed in the electrodeposition solution together, and the electrodeposition is carried out at a constant current of 45 μA for 2 hours; among them, the electric heating wire is constantan wire, and the approximate figure 2 a and figure 2 A heating wire with ZnO nanotapered rods standing on its surface shown in b.

[0046] Step 3, first immerse the heating wire with zinc oxide nano-tapered rods standing on its surface in a silv...

Embodiment 2

[0048] The concrete steps of preparation are:

[0049] Step 1: Mix poly(N-isopropylacrylamide), gold nanorods and water in a weight ratio of 1.9:0.0025:100 to obtain a mixed colloid.

[0050] In step 2, slowly add ammonia water with a concentration of 27 wt% to the zinc nitrate hexahydrate aqueous solution with a concentration of 1.8 wt%, until the white precipitate of zinc hydroxide is completely dissolved to obtain an electrodeposition solution. Then, the heating wire is used as the cathode and the graphite is used as the anode, and they are placed in the electrodeposition solution together, and the electrodeposition is carried out at a constant current of 48μA for 1.8h; among them, the heating wire is constantan wire, and an approximate figure 2 a and figure 2 A heating wire with ZnO nanotapered rods standing on its surface shown in b.

[0051] Step 3, first immerse the heating wire with zinc oxide nano-tapered rods standing on its surface in a silver nitrate solution w...

Embodiment 3

[0053] The concrete steps of preparation are:

[0054] Step 1: Mix poly(N-isopropylacrylamide), gold nanorods and water in a weight ratio of 2.0:0.002:100 to obtain a mixed colloid.

[0055] In step 2, slowly add ammonia water with a concentration of 28 wt% to the zinc nitrate hexahydrate aqueous solution with a concentration of 2.0 wt%, until the white precipitate of zinc hydroxide is completely dissolved to obtain an electrodeposition solution. Then, the heating wire is used as the cathode and the graphite is used as the anode, and they are placed in the electrodeposition solution together, and are electrodeposited at a constant current of 50 μA for 1.5 h; wherein, the heating wire is constantan wire, and the following is obtained: figure 2 a and figure 2 A heating wire with ZnO nanotapered rods standing on its surface shown in b.

[0056] Step 3, first immerse the heating wire with zinc oxide nano-tapered rods standing on its surface in a silver nitrate solution with a ...

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Abstract

The invention discloses an SERS (surface enhanced Raman scattering) device, as well as a preparing method and application thereof. The device comprises a capillary tube with a mixing colloid and an active substrate both arranged therein, wherein the mixing colloid consists of poly-(N-isopropyl acrylamide), gold nanorods and water with the weight ratio of (1.8-2.2):(0.001-0.003):(100); the active substrate adopts the structure that tapered zinc oxide nanorods with silver nanoparticles modified surfaces are stood on the surface of a heating wire. The method includes the following steps: adding ammonia water in a zinc nitrate hexahydrate solution, and obtaining an electric precipitating solution after the ammonia water is completely dissolved; using the heating wire as a cathode and placing the heating wire in the solution for electric precipitation, so as to obtain the heating wire with tapered nanorods stood on the surface; then immersing the heating wire with the tapered nanorods stood on the surface in a silver nitrate solution and irradiating the heating wire by ultraviolet light, so as to obtain an active substrate; then placing the active substrate and the mixing colloid in the capillary tube, so as to prepare the target product. According to the invention, the SERS device can be widely applied in real-time detection of pollutants in water solutions in environmental, chemical, biological fields and the like.

Description

technical field [0001] The invention relates to a device, a preparation method and use thereof, in particular to a surface-enhanced Raman scattering device and a preparation method and use thereof. Background technique [0002] Surface-enhanced Raman scattering (SERS) technology has been developed into an effective analytical method since its discovery more than three decades ago. Recently, in order to detect organic matter in aqueous solution in real time, people have attempted to measure the content of organic matter directly from the SERS active substrate in contact with the aqueous solution to be tested, such as the title "AupNIPAM Colloids as Molecular Traps for Surface-Enhanced," Spectroscopic, Ultra- Sensitive Analysis, 2009, 48(1): 138-143 (gold poly(N-isopropylacrylamide) colloid as molecular capture for surface enhancement, spectroscopy, ultrasensitive detection, "German Applied Chemistry" 2009 Vol. 48 No. 1, pp. 138-143). The gold poly(N-isopropylacrylamide) col...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
Inventor 周琪涛孟国文朱储红张卓周飞汪志伟
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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