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Method for preparing metal nano-particle modified polysaccharide wrapped carbon nano tube

A technology of metal nanoparticles and carbon nanotubes, which is applied in the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of cumbersome preparation of activated carbon nanotubes, difficult separation, low yield and unsuitable for promotion, and achieves the preparation method Simple and efficient, good water solubility and low price

Inactive Publication Date: 2010-08-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this prior art are: the preparation of activated carbon nanotubes is relatively cumbersome, the yield is low, it is not suitable for promotion, and the separation is difficult.

Method used

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  • Method for preparing metal nano-particle modified polysaccharide wrapped carbon nano tube
  • Method for preparing metal nano-particle modified polysaccharide wrapped carbon nano tube
  • Method for preparing metal nano-particle modified polysaccharide wrapped carbon nano tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Single-walled carbon nanotubes prepared by chemical vapor deposition method are used as the initial raw material, after purification and truncation pre-treatment, chitosan is functionalized on the surface of single-walled carbon nanotubes by non-covalent physical coating method to obtain chitosan Modified carbon nanotubes, and then comprehensively utilize the chemical reduction method commonly used in the preparation technology of metal nanoparticles and the "nucleation-growth" control method in crystallography, and finally prepare gold nanoparticles modified single-walled carbon nanotubes (cut -SWNT / CHI-Au). Specific steps are as follows:

[0043] Step 1: Add 120 mg of carbon nanotube raw material and 3 mol / L nitric acid to a single-necked round-bottomed flask equipped with a magnetic stirring rotor, heat it to 150 °C after 30 min with 40 kHz sonication, and react under reflux for 24 h with stirring. ф0.22μm polytetrafluoroethylene microporous filter membrane, washed ...

Embodiment 2

[0050] The single-walled carbon nanotubes prepared by chemical vapor deposition method are used as the initial raw material. After purification and truncation, the sodium alginate and chitosan with opposite charges are combined under the comprehensive drive of hydrophobic force and electrostatic force adsorption. Molecules were coated on the surface of single-walled carbon nanotubes successively, and then another kind of single-walled carbon nanotubes with denser surface modification of metal nanoparticles was prepared by using chemical reduction method and crystal growth method. Specific steps are as follows:

[0051] Step 1: In a single-necked round-bottomed flask equipped with a magnetic stirring rotor, add 120 mg of single-walled carbon nanotube raw material and 3 mol / L nitric acid, treat with 40 kHz sonication for 30 min, heat to 150 ° C, and react under reflux for 24 h. Suction filtration with ф0.22μm polytetrafluoroethylene microporous filter membrane, repeated washing ...

Embodiment 3

[0060] Single-walled carbon nanotubes prepared by catalytic pyrolysis are used as the initial raw material. After purification and truncation treatment, a solution of truncated carbon nanotubes with sufficient acidification and good dispersion is obtained, and then the shell is separated by non-covalent physical action. Polysaccharides are coated on the surface of carbon nanotubes, and finally carbon nanotubes with gold-silver alloy nanoparticles on the surface are prepared by chemical reduction method and crystal nucleation growth method. Specific steps are as follows:

[0061] Step 1: Add 120 mg of carbon nanotube raw material and 3 mol / L nitric acid to a single-neck round bottom flask equipped with a magnetic stirrer, heat it to 150 °C after 30 min with 40 kHz sonication, and react under reflux for 24 h with stirring. ф0.22μm polytetrafluoroethylene microporous filter membrane, washed repeatedly with a large amount of deionized water until neutral, vacuum dried at 40°C for ...

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Abstract

The invention discloses a method for preparing a metal nano-particle modified polysaccharide wrapped carbon nano tube in the technical field of nano composite materials. The method comprises the following steps: placing a carbon nano tube raw material in oxidizing acid and mixed acid in turn, performing ultrasonic truncation treatment on the solution, mixing the treated solution and polysaccharide solution to obtain polysaccharide wrapped carbon nano tube solution, then reducing a metal precursor to obtain a metal crystal seed modified carbon nano tube by using a strong reducing agent, and finally reducing a metal salt precursor to obtain a series of metal nano-particle modified polysaccharide wrapped carbon nano tubes with different growth degree by using a weak reducing agent. The method can improve the dispersion of the carbon nano tube in the water, effectively fix the metal nano-particles and control the modification density and grain size of the metal nano-particles, further cancontrol the plasma resonance absorption performance of the surface metal nano-particles, and is expected to be applied in the fields of targeted detection of cancer cells, photo-thermal treatment, biosensors and the like.

Description

technical field [0001] The invention relates to a method in the technical field of nanocomposite materials, in particular to a method for preparing metal nanoparticle-modified polysaccharide-coated carbon nanotubes. Background technique [0002] Carbon nanotube is a new type of carbon single substance structure discovered at the end of the 20th century. It can be regarded as a seamless tubular structure formed by winding single-layer or multi-layer graphite surfaces according to a certain crystallographic vector direction. It is terminated by half a fullerene molecule and is a one-dimensional quantum material with a high degree of π-electron delocalization on the tube wall. According to the different tube wall structures, CNTs can be divided into single-walled carbon nanotubes and multi-walled carbon nanotubes. The current commercial preparation methods mainly include catalytic pyrolysis, arc discharge, template method or chemical vapor deposition method. Because CNTs have ...

Claims

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Application Information

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IPC IPC(8): B82B3/00
Inventor 夏文健孟令杰路庆华
Owner SHANGHAI JIAO TONG UNIV
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