Carbon nanotube-thionine/gold nanoparticle composite material and preparation method and application thereof

A technology of gold nanoparticles and carbon nanotubes, applied in the direction of nanotechnology, nanotechnology, analytical materials, etc., can solve the problem of auxiliary reducing agent and support matrix without any literature and patent reports, weak surface adhesion of carbon nanotubes, gold The problem of large particle size of nanoparticles can achieve the effect of simple method, strong adhesion ability and large specific surface area

Active Publication Date: 2019-04-12
HUNAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The carbon nanotube / gold nanoparticle composite system that has been studied is mostly completed in steps, and the particle size of the gold nanoparticles in the prepared composite material is relatively large (>10nm).
However, gold particles with large diameters are not evenly distributed on the carbon nanotubes, and the adhesion on the surface of the carbon nanotubes is weak, so that the gold nanoparticles are easy to fall off from the surface of the carbon nanotubes.
At present, there are no literature and patent reports on the use of carbon nanotube-thionine (especially multi-walled carbon nanotube-thionine) as an auxiliary reducing agent and support matrix for gold nanoparticles.

Method used

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  • Carbon nanotube-thionine/gold nanoparticle composite material and preparation method and application thereof
  • Carbon nanotube-thionine/gold nanoparticle composite material and preparation method and application thereof
  • Carbon nanotube-thionine/gold nanoparticle composite material and preparation method and application thereof

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Embodiment 1

[0069] A preparation method of carbon nanotube-thionine / gold nanoparticle composite material, the method comprises the following steps:

[0070] (1) Acidification and cutting of carbon nanotubes: disperse 50mg of multi-walled carbon nanotubes in 50mL concentrated HNO at 1:3 3 (68%) and H 2 SO 4 (98%) mixture, sonicated in a 90°C water bath for 2 hours, after which, diluted with ice water to prevent further reaction; then the mixture was centrifuged, washed thoroughly with distilled water and repeated cycles until the pH value was about 7, centrifuged, and then at 70 Dry in an oven at ℃ for 18 hours;

[0071] (2) Preparation of carbon nanotube-thionine: dissolve 50mg of thionine in 20mL of 50°C hot water; then, add it to 20mL of the 2mg / mL carbon nanotube aqueous dispersion prepared in (1), And react at 30°C for 60 minutes; then, centrifuge at 12000rmp, wash the obtained sediment, centrifuge again, and finally dry in an oven at 70°C for 18 hours;

[0072] (3) Preparation of...

Embodiment 2

[0075] (1) Acidification and cutting of multi-walled carbon nanotubes: disperse 40 mg of multi-walled carbon nanotubes in 50 mL of concentrated HNO at 1:3 3 (68%) and H 2 SO 4 (98%) mixture, sonicate for 4 hours in a water bath at 80°C, after which, dilute with ice water to prevent further reaction; then centrifuge the mixture, wash thoroughly with distilled water and repeat the cycle until the pH value is about 7 (greater than 6), centrifuge Separating, and then drying the solid in an oven at 60°C for 24 hours to obtain pretreated carbon nanotubes;

[0076] (2) Preparation of carbon nanotube-thionine: dissolve 30mg of thionine in 20mL of 60°C hot water to obtain a thionine aqueous solution; subsequently, add the thionine aqueous solution to 20mL of the 2mg / mL prepared in step (1). carbon nanotube water dispersion, and reacted at 40°C for 30 minutes; then, centrifuged at 10,000rmp, washed the obtained sediment, centrifuged again, and finally dried in an oven at 60°C for 24 h...

Embodiment 3

[0080] Repeat embodiment 2, just stabilizer adopts citric acid, and reducing agent adopts the aqueous solution of sodium borohydride.

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Abstract

The invention discloses a carbon nanotube-thionine / gold nanoparticle composite material and a preparation method thereof. According to the carbon nanotube-thionine / gold nanoparticle composite material, acidified cut short carbon nanotubes and thionine are used as raw materials, and a carbon nanotube-thionine composite with high loading of thionine electrical signal molecules is prepared; and a ternary nanocomposite is prepared by using the carbon nanotube-thionine composite as a support matrix and micro-gold nanoparticles reduced by Au-N and Au-S bonding. The composite material has high conductivity, small gold particle size, uniform dispersion, large specific surface area and high adhesion ability on a substrate. The preparation method of the carbon nanotube-thionine / gold nanoparticle composite material is simple, convenient and easy to operate. The composite material can be used as sensitive electrical signal probes for immunosensors and DNA sensors.

Description

technical field [0001] The invention specifically relates to a nanoparticle composite material, in particular to a carbon nanotube-thionine / gold nanoparticle composite (CNTs-Thi / AuNPs) and its preparation method and use, belonging to the technical field of material engineering. Background technique [0002] Carbon nanotubes (CNTs) have been widely used in the field of material research due to their ideal electronic properties, large specific surface area, good biocompatibility, easy preparation and ability to form a three-dimensional conductive matrix. Although carbon nanotubes have two terminals, due to poor ion permeability, it is difficult to enter the inner hole and reach the inner surface, so the utilization of their surface is still mainly limited to their outer surface, while the utilization of the inner surface is low. In recent years, researchers have believed that the catalytic ability of carbon nanotubes is affected by their surface defects, which can not only cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00G01N27/327B82Y30/00B82Y40/00
CPCG01N27/3275G01N27/3278B82Y30/00B82Y40/00B22F9/24B22F1/0547B22F1/07
Inventor 邓克勤刘新艳李春香
Owner HUNAN UNIV OF SCI & TECH
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