Method for preparing precious metal gold particle catalytically-grown stannic oxide nanowire

A noble metal and tin oxide technology, applied in the field of catalysis, can solve problems such as unsatisfactory performance, and achieve the effects of no need for post-processing, high product purity, and simple equipment and technology

Active Publication Date: 2013-04-17
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there have been many reports in the literature on the preparation of nanomaterials with tin oxide nanowire structure, but their performance in gas sensors, solar cells, etc. is not ideal, and it is necessary to improve the preparation method to improve the performance of tin oxide

Method used

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  • Method for preparing precious metal gold particle catalytically-grown stannic oxide nanowire
  • Method for preparing precious metal gold particle catalytically-grown stannic oxide nanowire
  • Method for preparing precious metal gold particle catalytically-grown stannic oxide nanowire

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Embodiment 1

[0022] The precursor solution was formed by ultrasonically dissolving tin tetrachloride pentahydrate and chloroauric acid in absolute ethanol, in which the concentration of tin tetrachloride was 0.2 mol / l, and the molar ratio of Sn to Au was 100:1. The above-mentioned precursor solution is fed into the flame reaction zone with hydrogen / air as the auxiliary flame through a syringe pump and an atomizer at a feed rate of 4ml / min, and the hydrolysis reaction is carried out at a reaction temperature of 1800-2000°C. The total gas flow of hydrogen / air in the reaction flame is 1.8m 3 / h, the volume ratio of hydrogen / air is 1:5. The gaseous tin oxide generated by the hydrolysis reaction in the flame condenses and nucleates and grows along a certain direction under the induction and catalysis of the catalyst Au (VLS mechanism), and finally forms a tin oxide nanowire structure with noble metal gold particles at the tip. The nanowire has a diameter of 10-20 nm and a length of 0.2-0.5 μm....

Embodiment 2

[0024] The precursor solution was formed by ultrasonically dissolving tin tetrachloride pentahydrate and chloroauric acid in absolute ethanol, in which the concentration of tin tetrachloride was 0.1 mol / l, and the molar ratio of Sn to Au was 50:1. The above-mentioned precursor solution is fed into the flame reaction zone with hydrogen / air as the auxiliary flame through a syringe pump and an atomizer at a feed rate of 4ml / min, and the hydrolysis reaction is carried out at a reaction temperature of 1600-1800°C. The total gas flow of hydrogen / air in the reaction flame is 1.2m 3 / h, the volume ratio of hydrogen / air is 1:3. The gaseous tin oxide produced by the hydrolysis reaction in the flame is induced and catalyzed by the catalyst Au, condenses and grows along a certain direction, and finally forms a tin oxide nanowire structure with noble metal gold particles at the tip. The diameter of the nanowire is 10-20nm, length 0.1-1μm. The TEM photograph of the product is as figure ...

Embodiment 3

[0026] The precursor solution was formed by ultrasonically dissolving tin tetrachloride pentahydrate and chloroauric acid in absolute ethanol, in which the concentration of tin tetrachloride was 0.2 mol / l, and the molar ratio of Sn to Au was 250:1. The above-mentioned precursor solution is fed into the flame reaction zone with hydrogen / air as the auxiliary flame through a syringe pump and an atomizer at a feed rate of 4ml / min, and the hydrolysis reaction is carried out at a reaction temperature of 1800-2000°C. The total gas flow of hydrogen / air in the reaction flame is 1.8m 3 / h, the volume ratio of hydrogen / air is 1:5. The gaseous tin oxide produced by the hydrolysis reaction in the flame is induced and catalyzed by the catalyst Au, condenses and grows along a certain direction, and finally forms a tin oxide nanowire structure with noble metal gold particles at the tip. The diameter of the nanowire is 10~30nm, length 0.2~0.5um. The TEM photograph of the product is as imag...

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Abstract

The invention discloses a method for preparing a precious metal gold particle catalytically-grown stannic oxide nanowire. The method comprises the following steps of: introducing a precursor into a flame reaction chamber under the drive of an injection pump and atomization diffusion of the oxygen by using tetrachlorostannane pentahydrate and absolute ethyl alcohol solution of chloroauric acid as the precursor; assisting the burning of diffusion flame and precursor solution to provide heat energy at the reaction temperature of 1,600-2,000 DEG C to obtain a highly-crystallized stannic oxide nanowire under a catalytic induction function of the precious metal gold particles and high-temperature flame atmosphere. The stannic oxide nanowire prepared by the method, of which the sharp end is provided with the precious metal gold particles, can generate interface plasma resonance effect together with stannic oxide serving as a semiconductor and can be widely applied to the fields of dye-sensitized solar cells, gas sensitive sensors and the like.

Description

technical field [0001] The invention relates to the field of catalysis, in particular to a method for preparing tin oxide nanowires catalyzed by noble metal gold particles. Background technique [0002] Inorganic semiconductor one-dimensional nanostructures, such as nanowires, nanorods, nanobelts, nanotubes and other nanomaterials, due to their unique physical and chemical properties of low dimensionality and quantum confinement effects, plus precise and controllable size and shape characteristics , has aroused great interest in recent years and is regarded as an ideal material for assembling high-performance nanodevices. Among them, tin dioxide (SnO 2 ) nanowires are especially valued for their wider applications. Tin dioxide is a good n-type semiconductor material. It not only has a wide band gap (3.6eV), but also has stable physical and chemical properties, good permeability to light, and high sensitivity to gases. It is widely used. In gas sensors, solar cells, optica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02B82Y30/00B01J23/52
Inventor 胡彦杰李春忠侯晓宇徐可心
Owner EAST CHINA UNIV OF SCI & TECH
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