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Sunflower nano array structure for enhancing SERS activity and preparation method thereof

A nano-array and sunflower technology, applied in the field of SERS-enhanced sunflower nano-array structure and its preparation, can solve the problems of difficulty in controlling the gap between nanoparticles, poor periodicity of the array structure, and affecting the coupling of nanoparticles

Active Publication Date: 2020-07-17
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To prepare SERS substrates by this method, to increase the detection activity of gas SERS, it is necessary to reduce the diameter of polystyrene microspheres used in the preparation process, but when the diameter of microspheres is reduced, the Brownian motion of molecules will be intensified, making The microspheres become more and more uneven in the process of arrangement, and it is difficult to control the closeness of the polystyrene microspheres to each other during the self-assembly process, which will make it difficult to control the gap between the nanoparticles in the prepared array structure, which will affect the distance between the nanoparticles. The coupling between them will affect the activity of SERS detection; moreover, the different gaps between nanoparticles will also lead to poor periodicity of the array structure, and the signal intensity detected at different places on the SERS substrate will affect the accuracy of SERS detection. and repeatability

Method used

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  • Sunflower nano array structure for enhancing SERS activity and preparation method thereof
  • Sunflower nano array structure for enhancing SERS activity and preparation method thereof
  • Sunflower nano array structure for enhancing SERS activity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Prepare a sunflower nanoarray structure that enhances SERS activity by the following steps, and use the array structure as a substrate for SERS detection:

[0071] (1) Clean the silicon wafer, the specific process is as follows:

[0072] (1.1) Prepare a mixed solution of ammonia water, hydrogen peroxide and deionized water with a volume ratio of 1:2:6, and put a silicon wafer with a size of 2 cm×2 cm into the mixed solution;

[0073] (1.2) Heat the solution on a heating platform set at 300°C, keep the solution boiling for 5 minutes and then stop heating;

[0074] (1.3) After the solution is cooled to room temperature, take out the silicon wafer and put it into a clean beaker, add deionized water and alcohol to ultrasonically clean it for 3 times, put the cleaned silicon wafer into ultrapure water and save it for later use.

[0075] (2) By self-assembly method, an ordered monolayer array composed of polystyrene microspheres with two diameters is prepared on the surface ...

Embodiment 2

[0088] Prepare a sunflower nanoarray structure that enhances SERS activity by the following steps, and use the array structure as a substrate for SERS detection:

[0089] (1) Clean the silicon wafer, the specific process is as follows:

[0090] (1.1) Prepare a mixed solution of ammonia water, hydrogen peroxide and deionized water with a volume ratio of 1:2:6, and put a silicon wafer with a size of 2 cm×2 cm into the mixed solution;

[0091] (1.2) Heat the solution on a heating platform set at 300°C, keep the solution boiling for 5 minutes and then stop heating;

[0092] (1.3) After the solution is cooled to room temperature, take out the silicon wafer and put it into a clean beaker, add deionized water and alcohol to ultrasonically clean it for 3 times, put the cleaned silicon wafer into ultrapure water and save it for later use.

[0093] (2) By self-assembly method, an ordered monolayer array composed of polystyrene microspheres with two diameters is prepared on the surface ...

Embodiment 3

[0106] Prepare a sunflower nanoarray structure that enhances SERS activity by the following steps, and use the array structure as a substrate for SERS detection:

[0107] (1) Clean the silicon wafer, the specific process is as follows:

[0108] (1.1) Prepare a mixed solution of ammonia water, hydrogen peroxide and deionized water with a volume ratio of 1:2:6, and put a silicon wafer with a size of 2 cm×2 cm into the mixed solution;

[0109] (1.2) Heat the solution on a heating platform set at 300°C, keep the solution boiling for 5 minutes and then stop heating;

[0110] (1.3) After the solution is cooled to room temperature, take out the silicon wafer and put it into a clean beaker, add deionized water and alcohol to ultrasonically clean it for 3 times, put the cleaned silicon wafer into ultrapure water and save it for later use.

[0111] (2) By self-assembly method, an ordered monolayer array composed of polystyrene microspheres with two diameters is prepared on the surface ...

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Abstract

The invention relates to the technical field of nano materials, and discloses a sunflower nano array structure for enhancing SERS activity and a preparation method thereof. The preparation method comprises the following steps: cleaning a silicon wafer; preparing an ordered single-layer sunflower array consisting of polystyrene microspheres with two diameters on the surface of a silicon wafer through a self-assembly method, wherein the diameter ratio of the two polystyrene microspheres is 1: (2.5-10); etching the polystyrene microsphere array until the diameters of the polystyrene microsphereswith smaller diameters are reduced by 10%-40%; and sputtering silver on the etched array to obtain the sunflower nano array structure capable of enhancing the SERS activity. The sunflower nano array structure prepared by the preparation method disclosed by the invention is relatively high in SERS activity, and the sensitivity, accuracy and repeatability of SERS detection can be improved.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a sunflower nano-array structure for enhancing SERS activity and a preparation method thereof. Background technique [0002] Surface-Enhanced Raman Scattering (SERS) technology refers to the Raman scattering of the adsorbed molecules when a certain molecule is adsorbed on the rough surface or particle surface of a specially prepared metal sheet such as silver, gold or copper. A phenomenon in which signal strength is greatly increased. Due to the advantages of high sensitivity, good reproducibility and convenient operation, SERS detection has become a promising method in many fields such as adsorption and catalytic reaction test, single molecule detection, medical examination, complex protein research and multi-component immune reaction. application technology. [0003] Because the SERS enhancement of nanostructures depends on the optical resonance properties of metal nano...

Claims

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Application Information

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IPC IPC(8): G01N21/65B82Y30/00B82Y40/00C08F212/08C08F220/06
CPCG01N21/658B82Y30/00B82Y40/00C08F212/08C08F220/06
Inventor 王雅新温嘉红赵晓宇张永军
Owner HANGZHOU DIANZI UNIV
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