Method for preparing silver nano particle modified titanium dioxide composite material

A technology of silver nanoparticles and titanium dioxide, applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve the problems of long preparation time, high cost, complicated process, etc., and achieve low cost, mild conditions and simple process Effect

Inactive Publication Date: 2019-10-18
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] These liquid-phase chemical reduction methods need to add reducing agents such as hydrazine hydrate, ascorbic acid, citric acid, etc., and often add polyvinylpyrrolidone, chitosan and other substances as stabilizers or protective agents, all of which have complex processes, long preparation time, The disadvantages are high cost and more waste water generated during the preparation process. At the same time, the particle size controllability of the prepared silver nanoparticles is poor, and the composite strength of the silver nanoparticles and the titanium dioxide substrate is often unsatisfactory.

Method used

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  • Method for preparing silver nano particle modified titanium dioxide composite material
  • Method for preparing silver nano particle modified titanium dioxide composite material
  • Method for preparing silver nano particle modified titanium dioxide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0023] (1) Weigh 0.05g of titanium dioxide (commercial grade P25) and add it to 10mL of silver nitrate solution with a concentration of 0.1mol / L, configure it into a suspension with a concentration (mass volume ratio concentration of titanium dioxide) of 5g / L, and stir at room temperature for 2h ;

[0024] (2) drop the suspension of gained on the carbon film support net for transmission electron microscopy, and dry naturally to prepare the sample support film;

[0025] (3) Put the prepared sample support film loaded with silver ion-impregnated titanium dioxide particles into the transmission electron microscope, carry out electron beam irradiation, and control the irradiation beam intensity to be 50 / 100 / 150pA / nm respectively 2 , and the irradiation time was 60s, respectively, and the silver nanoparticle-modified titanium dioxide composite material was obtained.

[0026] See attached picture, figure 1 It is a transmission electron microscope (TEM) and a high-angle annular dar...

Embodiment II

[0029] (1) Weigh 0.5g of titanium dioxide (commercial grade P25) and add it to 10mL of silver nitrate solution with a concentration of 0.5mol / L, configure it into a suspension with a concentration (mass volume ratio concentration of titanium dioxide) of 50g / L, and stir at room temperature for 3h ;

[0030] (2) drop the suspension of gained on the carbon film support net for transmission electron microscopy, and dry naturally to prepare the sample support film;

[0031] (3) Put the prepared sample support film loaded with silver ion-impregnated titanium dioxide particles into the transmission electron microscope, carry out electron beam irradiation, and control the irradiation beam intensity to be 50 / 100 / 150pA / nm respectively 2 , and the irradiation time was 60s, respectively, and the silver nanoparticle-modified titanium dioxide composite material was obtained.

[0032] See attached picture, image 3 It is a transmission electron microscope (TEM) and a high-angle annular dar...

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Abstract

The invention discloses a method for a preparing silver nano particle modified titanium dioxide composite material. The method comprises the steps that a, titanium dioxide is added to a silver nitratesolution to be prepared into suspension and uniformly stirred at room temperature; b, the suspension obtained in step a is added to a carbon membrane supporting net for a transmission electron microscope dropwisely and naturally dried to obtain a sample supporting membrane; c, electron beam irradiation is conducted on the sample supporting membrane which is obtained in step b, the intensity of the irradiation beam is 50-150 pA / nm2, and therefore the silver nano particle modified titanium dioxide composite membrane material is obtained. The method has the advantages that the technology is simple, the cost is low, no organic solvent is used, and the particular diameter of the silver nano particle is controllable.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, and in particular relates to a method for preparing a silver nanoparticle-modified titanium dioxide composite material. Background technique [0002] Titanium dioxide is an important wide-bandgap semiconductor material, which is widely used in optics, photocatalysis, electricity and other fields. In order to design titanium dioxide-based functional materials with specific properties, various modification measures are often used, among which noble metal modified titanium dioxide is an important One of the means, the related performance can be effectively regulated. Among these modified metals, silver has been widely studied as an important member. Its excellent surface plasmon resonance effect endows composite materials with excellent photocatalysis, surface plasmon gas sensing and other properties. At present, the preparation of such composite materials is the most A broad method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/14B82Y40/00B82Y30/00C01G23/047
CPCC23C18/14B82Y40/00B82Y30/00C01G23/047C01P2004/04
Inventor 胡鹏飞毛智慧谢忱
Owner SHANGHAI UNIV
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