Application of gold nanoparticle modified carbon nanotube

A gold nanoparticle and carbon nanotube technology, applied in the field of carbon nanotubes, can solve the problems of difficult adsorption of gas molecules, complicated process, and poor detection effect

Active Publication Date: 2018-12-18
PEKING UNIV
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  • Abstract
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Problems solved by technology

[0005] However, in the prior art, surface-enhanced Raman detection is mostly suitable for the detection of liquids or solids, and less for the detection of gases. The main reason is that gas molecules are not easily adsorbed on the detection substrate. The interaction (combination) generally needs to modify the substrate or the substance to be detected, resulting in a complicated process, and the detection effect is not very good.

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  • Application of gold nanoparticle modified carbon nanotube
  • Application of gold nanoparticle modified carbon nanotube
  • Application of gold nanoparticle modified carbon nanotube

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Embodiment approach

[0058] According to a preferred embodiment of the present invention, the gold nanoparticle-modified carbon nanotubes are used for surface-enhanced Raman detection of small molecular substances with conjugated structures.

[0059] Among them, on the one hand, carbon nanotubes play the role of templates in the preparation of gold nanoparticles, which shortens the distance between gold nanoparticles and improves the SERS enhancement factor; on the other hand, the large π-conjugated system of carbon nanotubes can Effectively adsorb small molecules with conjugated structures, making them close to "hot spots" to obtain effective Raman enhancement and effectively reduce the detection limit.

[0060] Another aspect of the present invention provides a method for surface-enhanced Raman detection using gold nanoparticle-modified carbon nanotubes.

[0061] Wherein, the gold nanoparticle-modified carbon nanotubes use carbon nanotubes as a carrier, and gold nanoparticles react in situ on th...

Embodiment 1

[0118] (1) Preparation of carbon nanotube carrier:

[0119] (1.1) prepare the ethanolic solution of cobalt acetate tetrahydrate of 0.1mmol / L, namely catalyst precursor solution;

[0120] (1.2) Put the hollow groove into the Piranha solution, heat it at about 120°C for 20 minutes, then clean it with ultrapure water, ethanol, and ultrapure water in an ultrasonic cleaner, and finally dry it with nitrogen;

[0121] (1.3) Growth of single-walled carbon nanotubes

[0122] (1.3.1) Smear the catalyst precursor solution on the silicon substrate parallel to the direction of the groove with a pipette tip, and put it into a 2.5cm diameter quartz tube with a tube furnace jacket after natural drying;

[0123] (1.3.2) Heat the tube furnace to 500°C, push the silicon chip into it, and oxidize it in the air atmosphere for 5 minutes. After the oxidation is completed, push the silicon chip out of the high-temperature zone, and inject 300 sccm of argon gas for 3 minutes to discharge the quartz t...

Embodiment 2

[0136] Repeat the process of embodiment 1, difference is: carry out step (3) after step (2):

[0137] (3) Transferring the suspended part of the gold nanoparticle-modified carbon nanotube support to the silicon wafer.

[0138] Among them, the silicon wafer used is a silicon wafer containing a 300nm thick silicon dioxide layer, and the silicon wafer is heated at about 120°C for 20 minutes using piranha solution (Piranha solution is a mixed solution of concentrated sulfuric acid and hydrogen peroxide with a volume ratio of 7:3), and then Clean with ultrapure water, ethanol, and ultrapure water in an ultrasonic cleaner in sequence, and finally blow dry with nitrogen.

[0139] (3.1) Use a microsampler to drop 2 microliters of isopropanol (purity: MOS grade) onto the surface of the silicon wafer, and the isopropanol will spread naturally on the surface;

[0140] (3.2) Invert the gold nanoparticle-modified carbon nanotube carrier prepared in step (2), and fasten it on the silicon w...

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Abstract

The invention discloses an application of gold nanoparticle modified carbon nanotube, which is used for surface enhanced Raman detection, preferably surface enhanced Raman detection of a small molecule, wherein the gold nanoparticle modified carbon nanotube are used to produce a surface enhanced Raman detection substrate. The production method comprises step 1, growing or placing a carbon nanotube(2) on a hollow groove (1) to obtain a carbon nanotube carrier (3); step 2, performing in situ reaction on the carbon nanotube carrier (3) to form a gold nanoparticle, thereby obtaining a gold nanoparticle modified carbon nanotube carrier (4) which comprises a suspended portion (41); step 3, optionally, transferring the suspended portion (41) in the gold nanoparticle modified carbon nanotube carrier (4) to a silicon wafer (5) to obtain the surface enhanced Raman detection substrate (6). When used for surface enhanced Raman detection, the gold nanoparticle modified carbon nanotube can not onlydetect gas or liquid/solid vapor, but also detect a solution, and even realize single molecule detection.

Description

technical field [0001] The invention belongs to the field of carbon nanotubes, in particular to carbon nanotubes modified by gold nanoparticles, and in particular to the application of carbon nanotubes modified by gold nanoparticles. Background technique [0002] Raman spectroscopy belongs to molecular vibration spectroscopy, which can reflect the characteristic structure of molecules, but the light intensity due to the Raman scattering effect is only about 10 of the incident light intensity. -10 , so some kind of enhancement effect must be used in the Raman spectroscopy study of surface adsorbed substances. In the existing technology, in order to enhance the Raman detection effect, the single-molecule science team of the Microscale Laboratory of the Chinese Academy of Sciences combined high-resolution scanning tunneling microscopy technology with high-sensitivity optical detection technology into a combined system, which significantly improved the resolution. , and even si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65B82Y40/00
CPCB82Y40/00C01P2004/02G01N21/65G01N21/658G01N2021/655
Inventor 杨娟张达奇吕敏李贺楠李彦
Owner PEKING UNIV
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