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Gold-nanoparticle-modified carbon nanotube and preparation method and application thereof

A technology of gold nanoparticles and carbon nanotubes, which is applied in the direction of carbon nanotubes, single-walled carbon nanotubes, and nanocarbons, and can solve problems such as difficult control

Active Publication Date: 2018-07-31
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the prior art, most of the spherical particles of gold are first prepared, and then the carbon nanotubes are placed in the gold particles, or the carbon nanotubes are mixed with the gold solution to form a composite of CNT / gold particles. The Raman enhancement factor (Enhancement Factors, EF) of the obtained complex is relatively low
This is because the "hot spots" created between adjacent plasmas are not easy to control, and it is not possible to controllably place the carbon nanotubes on these "hot spots"

Method used

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  • Gold-nanoparticle-modified carbon nanotube and preparation method and application thereof

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Embodiment approach

[0047] According to a preferred embodiment of the present invention, the gold nanoparticles are in the shape of a polyhedron, and the edges of the polyhedron are attached to the carbon nanotube carrier.

[0048] In a further preferred embodiment, as Figure 6C and Figure 6D As shown, on the carbon nanotube support, there is at least one gold nanoparticle pair for in-situ reaction, and the gold nanoparticle pair is composed of two gold nanoparticles attached to the carbon nanotube support at the edges.

[0049] In a further preferred embodiment, such as Figure 6E As shown, the carbon nanotubes are located between a plurality of closely arranged polyhedral gold nanoparticles.

[0050] Wherein, a single gold nanoparticle can form a "hot spot" at its corners or edges, but the "hot spot" of a single gold nanoparticle is obviously weaker than the "hot spot" formed by a pair of gold nanoparticles. Therefore, in the present invention , preferably at least one pair of gold nanopar...

Embodiment 1

[0153] (1) Preparation of single-walled carbon nanotube carrier:

[0154] (1.1) prepare the ethanolic solution of cobalt acetate tetrahydrate of 0.1mmol / L, namely catalyst precursor solution;

[0155] (1.2) Put the grooved silicon wafer 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;

[0156] (1.3) Growth of single-walled carbon nanotubes

[0157] (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;

[0158] (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 ...

Embodiment 2

[0166] The preparation process of Example 1 was repeated, with the difference being step (2.1), wherein, chloroauric acid tetrahydrate was dissolved in water to prepare a chloroauric acid solution with a concentration of 40mmol / L.

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Abstract

The invention discloses a gold-nanoparticle-modified carbon nanotube and a preparation method and application thereof, wherein carbon nanotubes are used as a carrier, gold nanoparticles are loaded onthe surface of the carrier, and the gold nanoparticles are polyhedral structures. The method is carried out as follows: ontacting a gold compound solution in an atomized state with the heated carbon nanotube carrier for in-situ reduction to obtain the gold-nanoparticle-modified carbon nanotube. The gold-nanoparticle-modified carbon nanotube can be used for a detection substrate for surface enhanced Raman scattering. The gold nanoparticles supported on the gold-nanoparticle-modified carbon nanotube are the polyhedral structures having sharp edges and corners, have strong ''hot spots'', and thecarbon nanotubes are located in a ''hot spot'' region, so that the gold-nanoparticle-modified carbon nanotube has strong Raman enhancement effect. The method is simple, ingenious, and easy to implement, thereby obtaining the gold-nanoparticle-modified carbon nanotube.

Description

technical field [0001] The invention belongs to the field of carbon nanotubes, in particular to carbon nanotubes modified by gold nanoparticles, in particular to a carbon nanotube modified by gold nanoparticles and its preparation method and application. 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. Surface Enhanced Raman Scattering (SERS) is a surface-selective enhancement effect that can amplify the Raman signal of molecules adsorbed on the surface of a material to 10 6 to 10 14 times, it provides information at the molecular level for people to deeply characterize the structures and processes of various surfaces or interfaces (such as vario...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/159G01N21/65
CPCC01B2202/02C01P2002/82C01P2002/85C01P2004/03C01P2004/04G01N21/658
Inventor 杨娟张达奇李彦
Owner PEKING UNIV
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