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Preparation method of stannic oxide-titanium dioxide core-shell nano-structure

A technology of titanium dioxide and tin dioxide, which is applied in the field of preparation of tin dioxide-titanium dioxide core-shell structure nanocomposites, can solve the problems of low quantum efficiency, achieve simple process, uniform size distribution of core-shell structure, and broad application prospects Effect

Inactive Publication Date: 2012-10-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-titanium dioxide has a wide band gap and low quantum efficiency, which limits its application

Method used

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  • Preparation method of stannic oxide-titanium dioxide core-shell nano-structure
  • Preparation method of stannic oxide-titanium dioxide core-shell nano-structure
  • Preparation method of stannic oxide-titanium dioxide core-shell nano-structure

Examples

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Effect test

Embodiment 1

[0024] Example 1: Using silicon as a reaction substrate and gold as a catalyst to prepare a tin dioxide-titania core-shell structure.

[0025] First, the silicon substrate was ultrasonically cleaned in deionized water, acetone and ethanol for 30 minutes respectively, and the surface of the silicon substrate was blown dry with high-purity nitrogen; then the silicon substrate was placed in a vacuum sputtering apparatus, and about A nano-gold granular layer with a thickness of 90 nanometers; then place the porcelain boat filled with tin powder in the central high-temperature heating zone of the CVD device, place the silicon substrate at about 10 cm from the lower air outlet of the porcelain boat, and use a vacuum pump to reduce the vacuum degree of the CVD device. Adjust it below 5mTorr; moreover, raise the temperature of the high-temperature heating zone in the center of the CVD device to 800°C within 40 minutes, keep it at 800°C for 30 minutes and feed oxygen at a flow rate of 1...

Embodiment 2

[0026] Example 2: Using silicon dioxide as a reaction substrate and platinum as a catalyst to prepare a tin dioxide-titania core-shell structure.

[0027] First, the silicon dioxide substrate was ultrasonically cleaned in deionized water, acetone and ethanol for 30 minutes respectively, and the surface of the silicon dioxide substrate was blown dry with high-purity argon; then the silicon dioxide substrate was placed in a vacuum sputtering apparatus, and the The silicon dioxide surface is sputter-coated with a nano-platinum granular layer with a thickness of about 90 nanometers; then the porcelain boat filled with tin powder is placed in the central high-temperature heating area of ​​the CVD device, and the silicon dioxide substrate is placed about 10 cm below the air outlet of the porcelain boat At the place, use a vacuum pump to adjust the vacuum degree of the CVD device below 5mTorr; moreover, raise the temperature of the high-temperature heating zone in the center of the CV...

Embodiment 3

[0028] Example 3: Using silicon nitride as a reaction substrate and platinum as a catalyst to prepare a tin dioxide-titania core-shell structure.

[0029] First, the silicon nitride substrate was ultrasonically cleaned in deionized water, acetone and ethanol for 30 minutes respectively, and the surface of the silicon nitride substrate was blown dry with high-purity nitrogen; The surface of SiO is sputter-coated with a nano-gold granular layer with a thickness of about 90 nanometers; then the porcelain boat filled with tin powder is placed in the central high-temperature heating zone of the CVD device, and the silicon nitride substrate is placed about 10 cm below the air outlet of the porcelain boat , use a vacuum pump to adjust the vacuum degree of the CVD device below 5mTorr; moreover, raise the temperature of the high-temperature heating zone in the center of the CVD device to 800°C within 40 minutes, keep it at a high temperature of 800°C for 30 minutes and feed in oxygen at...

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Abstract

The invention relates to a preparation method of a stannic oxide-titanium dioxide core-shell nano-structure. The preparation method comprises the following steps of: preparing a stannic oxide nano-wire by a chemical vapor deposition method, and coating a titanium dioxide nano-structure of rutile phase on the surface of the stannic oxide nano-wire layer by layer by an atomic vapor deposition method. According to the preparation method, firstly, the stannic oxide nano-wire is grown on the surface of a silicon wafer which is sprayed with nano-gold particles by a chemical vapor deposition device; secondly, hydroxyl group is attached on the surface of the stannic oxide nano-wire by an ultraviolet treatment device; and finally, the silicon wafer grown with the stannic oxide nano-wire is put into an atomic layer deposition device, and alternately and circularly depositing the titanium dioxide nano-structure and the hydroxyl group by the atomic vapor deposition method, so that the stannic oxide-titanium dioxide core-shell nano-structure can be formed. The preparation method has the advantages that the operation flow is simple, the core-shell structure is accurate and controllable in the thickness and even in size distribution, etc.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and relates to a preparation method of a tin dioxide-titania core-shell structure nanocomposite material. Background technique [0002] Tin dioxide nanowires are widely used in gas sensing, humidity sensing, optical technology, etc. The higher sensitivity, selectivity and stability make tin dioxide have a broader application market prospect. In recent years, many methods for preparing tin dioxide nanowires have emerged, such as vacuum evaporation condensation method, low temperature plasma method, hydrolysis method, alkoxide hydrolysis method, sol-gel method and hydrothermal synthesis method. Under the condition that the current technical equipment level and nanowire application market have not really formed, most of the above nanowire preparation methods have not formed a practical production scale due to technical maturity or preparation cost. In the stage of providing researc...

Claims

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Application Information

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IPC IPC(8): B01J13/02
Inventor 董策舟聂安民王宏涛李倩倩冯琼周武
Owner ZHEJIANG UNIV
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