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Preparation and application of nanorod array with adjustable resonance wavelength

A nanometer and array technology is applied in the field of preparation of silver nanorod arrays, which can solve the problems of low cost and short detection time, and achieve the effects of simple method, low cost and high sensitivity.

Active Publication Date: 2020-01-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since Raman scattering is applied to the trace detection of biological and chemical molecules, it has the advantages of short detection time, fingerprint recognition, short detection time, low cost, and non-destructive detection. However, this method requires high-sensitivity surface-enhanced Raman base as base

Method used

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  • Preparation and application of nanorod array with adjustable resonance wavelength
  • Preparation and application of nanorod array with adjustable resonance wavelength
  • Preparation and application of nanorod array with adjustable resonance wavelength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) After the silicon substrate or glass substrate is treated by the "piranha method", the substrate is covered with polystyrene (PS) microspheres of different diameters (50-1000nm);

[0039] (2) fixing the substrate prepared in (1) on the sample stage of the electron beam evaporation coating machine;

[0040] (3) Using metallic silver as the target material, pump the chamber of the electron beam evaporation coating machine to 3×10 －5 ~2×10 －4 Pa high vacuum;

[0041] (4) Adjust the incident angle of the electron beam to 75-85 degrees, and make the sample stage static, grow a silver nanostructure film with a rod length of 647nm on the base of the sample stage, and the top of the nanorod has a plurality of bifurcated structures.

[0042] (5) The plasmon resonance excitation wavelength of the nanorod array can be adjusted by adjusting the length of the silver nanorods, so as to obtain the best enhancement under a specific Raman laser source.

Embodiment 2

[0044] (1) After the silicon substrate or glass substrate is treated by the "piranha method", the substrate is covered with polystyrene (PS) microspheres with a diameter of 500 nm;

[0045] (2) fixing the substrate prepared in (1) on the sample stage of the electron beam evaporation coating machine;

[0046] (3) Using metallic silver as the target material, pump the chamber of the electron beam evaporation coating machine to 3×10 －5 ~2×10 －4 Pa high vacuum;

[0047] (4) Adjust the incident angle of the electron beam to 75-85 degrees, and make the sample stage static, grow a silver nanostructure thin film with a rod length of 771 nm on the base of the sample stage, and the top of the nanorod has a plurality of bifurcated structures.

[0048] (5) The plasmon resonance excitation wavelength of the nanorod array can be adjusted by adjusting the length of the silver nanorods, so as to obtain the best enhancement under a specific Raman laser source.

[0049] (6) Mix 200 μL of trace...

Embodiment 3

[0053] (1) After the silicon substrate or glass substrate is treated by the "piranha method", the substrate is covered with polystyrene (PS) microspheres with a diameter of 500 nm;

[0054] (2) fixing the substrate prepared in (1) on the sample stage of the electron beam evaporation coating machine;

[0055] (3) Using metallic silver as the target material, pump the chamber of the electron beam evaporation coating machine to 3×10 －5 ~2×10 －4 Pa high vacuum;

[0056] (4) Adjust the incident angle of the electron beam to 75-85 degrees, and make the sample stage static, grow a silver nanostructure film with a rod length of 892nm on the base of the sample stage, and the top of the nanorod has a plurality of bifurcated structures.

[0057] (5) The plasmon resonance excitation wavelength of the nanorod array can be adjusted by adjusting the length of the silver nanorods, so as to obtain the best enhancement under a specific Raman laser source.

[0058] (6) Mix 200 μL of trace hyd...

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Abstract

The invention belongs to the technical field of detection of trace organic pollutants, and particularly relates to preparation of a nanorod array with adjustable resonance wavelength and a method forquickly detecting trace hydrazine through utilization of the surface-enhanced Raman effect of a silver nanorod. A surface-enhanced Raman substrate comprises a substrate body, and metal silver is deposited on the substrate body, and forms the nanorod array with a forky top. By preparing an independent silver nanorod array thin film with the forky top, the substrate with an excellent surface-enhanced Raman effect is obtained, and then trace hydrazine is quickly detected through the utilization of the surface-enhanced Raman effect. The method is simple, quick, low in cost and high in sensitivity.

Description

technical field [0001] The invention belongs to the technical field of trace organic pollutant detection, and in particular relates to the preparation of a silver nanorod array with adjustable resonance wavelength and a method for rapidly detecting trace hydrazine by utilizing the surface-enhanced Raman effect of the silver nanorod. Background technique [0002] Hydrazine (N 2 h 4 ) is a commonly used main fuel for liquid propellants, and as the energy working medium of rocket engines, it is widely used in the fields of launching missiles, satellites and spacecraft. Hydrazine is highly toxic, can cause skin allergies and systemic poisoning, has great damage to the human liver, kidney and nervous system, and has a potential carcinogenic risk. During various operations of liquid propellants, hydrazine can easily pollute environmental media such as the atmosphere, water, soil, and vegetation due to running, leaking, dripping, leaking, and sudden accidents. In the latest envi...

Claims

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Application Information

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IPC IPC(8): C23C14/30C23C14/16C23C14/18C23C14/02C23C14/54G01N21/65B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C23C14/024C23C14/16C23C14/18C23C14/30C23C14/54G01N21/658
Inventor 张政军谢拯
Owner TSINGHUA UNIV
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