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Silver nanoparticle modified carbon nanotube-egg membrane composite SERS substrate as well as preparation method and application thereof

A technology of silver nanoparticles and carbon nanotubes, which is applied in the direction of plating, coating, and metal material coating processes of superimposed layers, can solve the problems of complex preparation process, expensive equipment, time-consuming and energy-consuming, etc., and achieve simple process , simple equipment and wide range of sources

Inactive Publication Date: 2014-12-10
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

Although the various technical means mentioned in these articles can also obtain uniformly distributed nanostructured substrates in a large area, there are problems such as expensive equipment, complicated preparation process, high cost, and time-consuming and energy-consuming problems. Defects

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  • Silver nanoparticle modified carbon nanotube-egg membrane composite SERS substrate as well as preparation method and application thereof
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  • Silver nanoparticle modified carbon nanotube-egg membrane composite SERS substrate as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0038] The concrete steps of preparation are:

[0039] In step 1, the eggshell from which the egg white and yolk have been removed is ultrasonically cleaned twice with deionized water, and then placed in an 8wt% acetic acid solution to dissolve the boneless eggshell to obtain an egg membrane. After the egg membrane was ultrasonically cleaned with deionized water, it was placed in an ammonia solution with a concentration of 1 vol% for 3 minutes to obtain an approximate figure 1 The alkalized egg membrane shown in a.

[0040] In step 2, disperse the carboxylated carbon nanotubes in deionized water and sonicate for 30 minutes to obtain a uniformly dispersed carbon nanotube solution. After the alkalized egg membrane was ultrasonically cleaned with deionized water and dried, it was placed in a carbon nanotube solution with a concentration of 400g / L for 7min to obtain an approximate figure 1 The egg membrane with carbon nanotubes loaded on the surface shown in b; where, when sonic...

Embodiment 2

[0043] The concrete steps of preparation are:

[0044] In step 1, the eggshell from which the egg white and yolk have been removed is ultrasonically cleaned twice with deionized water, and then placed in an acetic acid solution with a concentration of 9 wt% to dissolve the eggshell to obtain an egg membrane. After the egg membrane was ultrasonically cleaned with deionized water, it was placed in an ammonia solution with a concentration of 1.5vol% for 4 minutes to obtain an approximate figure 1 The alkalized egg membrane shown in a.

[0045] Step 2, first disperse the carboxylated carbon nanotubes in deionized water and sonicate for 33 minutes to obtain a uniformly dispersed carbon nanotube solution. After the alkalized egg membrane was ultrasonically cleaned with deionized water and dried, it was placed in a carbon nanotube solution with a concentration of 450g / L for 6 minutes to obtain an approximate figure 1 The egg membrane with carbon nanotubes loaded on the surface show...

Embodiment 3

[0048] The concrete steps of preparation are:

[0049] In step 1, the eggshell from which the egg white and yolk have been removed is ultrasonically cleaned twice with deionized water, and then placed in an acetic acid solution with a concentration of 10 wt% to dissolve the eggshell to obtain an egg membrane. After the egg membrane was ultrasonically cleaned with deionized water, it was placed in an ammonia solution with a concentration of 2vol% for 5 minutes to obtain the following: figure 1 The alkalized egg membrane shown in a.

[0050] Step 2, first disperse the carboxylated carbon nanotubes in deionized water and sonicate for 35 minutes to obtain a uniformly dispersed carbon nanotube solution. Then use deionized water to ultrasonically clean and dry the egg membrane that has been alkalized, and place it in a carbon nanotube solution with a concentration of 500g / L for ultrasonication for 5min to obtain the following: figure 1 The egg membrane with carbon nanotubes loaded...

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Abstract

The invention discloses a silver nanoparticle modified carbon nanotube-egg membrane composite surface enhanced Raman scattering (SERS) substrate as well as a preparation method and application thereof. The SERS substrate is composed of a carbon nanotube loaded on an egg membrane and silver nanoparticles modified on the carbon nanotube, wherein the carbon nanotube is 0.5-2mu m long and is 30-50nm in diameter, and sizes of the silver nanoparticles are 5-10nm. The preparation method comprises the following steps: dissolving egg shell in an acetic acid solution to obtain an egg membrane, ultrasonically processing the egg membrane in an ammonium solution to obtain alkalified egg membrane, then dispersing a carbon nanotube processed by carboxylation in de-ionized water and ultrasonically processing to obtain a carbon nanotube solution, and ultrasonically processing the alkalified egg membrane in the carbon nanotube solution to obtain the egg membrane loaded with the carbon nanotube on the surface; and finally, sputtering silver on the egg membrane in a sputtering instrument to obtain a target product. The SERS substrate disclosed by the invention can serve as an active substrate for surface enhanced Raman scattering; and through a laser Raman spectrometer, content of rhodamine or parathion-methyl or polychlorinated biphenyl PCB-3 or bovine serum albumin attached on the substrate is measured.

Description

technical field [0001] The invention relates to a SERS substrate, its preparation method and application, in particular to a carbon nanotube-egg membrane composite SERS substrate modified by silver nanoparticles, its preparation method and application. Background technique [0002] Relevant theoretical calculations and experimental studies have shown that the surface-enhanced Raman scattering (SERS) substrate with noble metal nanomaterials such as gold, silver, and copper as the building unit has high SERS when the gap between the noble metal nanostructures is less than 10nm. At the same time, if the substrate material has a large specific surface area and has good adsorption properties for target molecules, it will facilitate the adsorption and enrichment of target molecules on the substrate surface and improve the sensitivity of detection. Furthermore, in order to ensure the signal uniformity of the substrate and the repeatability of the measurement results, it is required...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00G01N21/65
Inventor 王美玲孟国文
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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