Nano-silver modified titanium oxide nanotube array, preparation method and application thereof

A technology of titanium oxide nanotubes and nano-silver, which is applied in the field of nano-materials, can solve the problems of affecting photocatalytic performance and SERS performance, reducing photocatalytic performance and SERS performance, and difficult to modify silver nanoparticles, so as to achieve easy promotion and use, and low cost. Low, wide range of effects

Pending Publication Date: 2021-11-30
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the outer wall of the titanium oxide nanotubes prepared by this method is close to each other, and the outer surface is not exposed, which seriously reduces its specific surface area. In addition, due to the limitation of the preparation method (anodic oxidation voltage is 40-60 volts), the obtained TiO2 nanotubes have small pore size. In the process of modifying silver nanoparticles on the inner wall of titania nanotubes, if the particle size of silver nanoparticles is small (mostly less than 5nm), the photocatalytic performance and SERS performance will be reduced; The particle size of the nanoparticles is easy to connect to each other at the nozzle to form large particles, thereby blocking the nozzle, making it difficult to modify a large number of silver nanoparticles inside the tube, and finally causing the silver nanoparticles to be mainly modified in the two-dimensional plane where the nozzle is located. , which will also seriously affect the photocatalytic performance and SERS performance

Method used

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  • Nano-silver modified titanium oxide nanotube array, preparation method and application thereof
  • Nano-silver modified titanium oxide nanotube array, preparation method and application thereof
  • Nano-silver modified titanium oxide nanotube array, preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The silicon wafer substrate is selected as the conductive substrate, and the specific steps of preparation are as follows:

[0036] 01. Use plasma to bombard the conductive surface of the conductive substrate in an oxygen atmosphere for 240 seconds to increase the hydrophilicity of the surface. After the bombardment, clean the surface of the conductive substrate once with deionized water and dry it in an oven at 60°C Dry;

[0037] 02. Preparation of zinc oxide nanorod arrays: Add 100ml of water into 0.008mol zinc nitrate hexahydrate, after fully dissolving, add 10wt% ammonia water drop by drop to make it clear, and place the conductive The substrate was vertically placed in the zinc ammonia solution, and zinc oxide nanorods were grown on the surface of the conductive substrate for 60 minutes. After the reaction, the surface of the conductive substrate on which the ZnO nanorod arrays were grown was washed once with deionized water, and then dried at room temperature.

...

Embodiment 2

[0041] The indium tin oxide glass substrate is selected as the conductive bottom, and the specific steps of preparation are as follows:

[0042] 01. Use plasma to bombard the conductive surface of the conductive substrate for 300s in an oxygen atmosphere to increase the hydrophilicity of the surface. After the bombardment, clean the surface of the conductive substrate twice with deionized water and bake in an oven at 60°C Dry;

[0043] 02. Preparation of zinc oxide nanorod arrays: Add 100ml of water into 0.010mol of zinc nitrate hexahydrate. After fully dissolving, add 10wt% ammonia water drop by drop to make it clear. The substrate was vertically placed in the zinc ammonia solution, and zinc oxide nanorods were grown on the surface of the conductive substrate for 75 minutes. After the reaction, the surface of the conductive substrate on which the ZnO nanorod arrays were grown was washed twice with deionized water, and then dried at room temperature.

[0044] 03. Preparation...

Embodiment 3

[0047] The indium tin oxide glass substrate is selected as the conductive substrate, and the specific steps of preparation are as follows:

[0048] 01. Use plasma to bombard the conductive surface of the conductive substrate for 360s in an oxygen atmosphere to increase the hydrophilicity of the surface. After the bombardment, clean the conductive surface with deionized water for 3 times, and bake in an oven at 60°C Dry;

[0049] 02. Preparation of zinc oxide nanorod arrays: Add 100ml of water into 0.012mol of zinc nitrate hexahydrate. After fully dissolving, add 10wt% ammonia water drop by drop to make it clear. The substrate was vertically placed in the zinc ammonia solution, and zinc oxide nanorods were grown on the surface of the conductive substrate for 90 minutes. After the reaction, the surface of the conductive substrate on which the ZnO nanorod arrays were grown was washed with deionized water for 3 times, and then dried at room temperature.

[0050] 03. Preparation ...

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Abstract

The invention discloses a nano-silver modified titanium oxide nanotube array, a preparation method and application thereof. The titanium oxide nanotube grows on a conductive substrate and is a single-layer titanium oxide nano array, wherein silver nanoparticles are modified on the surface of the titanium oxide nanotube, the length of the titanium oxide nanotube is 4-10 [mu]m, the diameter of the titanium oxide nanotube is 0.5-1 [mu]m, the particle size of the silver nanoparticles is 20-150 nm, and the titanium oxide nanotube has a large number of gaps or gaps which are located among the silver nanoparticles and have the width smaller than or equal to 10 nm. The preparation method of the material comprises the following steps: bombarding conductive glass by using plasma in an oxygen atmosphere to increase the hydrophilicity of the surface of the conductive glass; growing a zinc oxide nanorod on the surface of the conductive glass in a zinc ammonia solution under the condition of 60-80 DEG C water bath; under the action of a fluotitanic acid solution, converting the zinc oxide nanorod into a titanium oxide nanotube with a closed top end in situ; and finally, modifying silver nanoparticles on the surface of the titanium oxide nanotube by utilizing a silver mirror reaction to prepare a target product. The product has high surface enhanced Raman scattering (SERS) activity, and is extremely easy to widely and commercially apply to rapid trace detection of a coloring agent rhodamine 6G.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a titanium oxide nanotube array modified by nanometer silver and its preparation method and application. Background technique [0002] Surface-enhanced Raman scattering (SERS) spectroscopy detection technology can provide spectra with fingerprint information of molecular vibrations, and has important potential application prospects in trace detection and other fields. In order to obtain high detection sensitivity, researchers try to prepare three-dimensional SERS substrates. For example, the journal "Nano Research" reported on pages 957–966 of Volume 8, Issue 3, 2015, entitled "Preparation of nanotube arrays assembled by noble metal nanostructure units by sacrificial template method of zinc oxide nanocone arrays and using them as Three-dimensional SERS substrate" research results (ZnO-nanotaper array sacrificial templated synthesis of noble-metal building-block assem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65C23C18/44C01G23/053B82Y40/00B22F1/02
CPCG01N21/658G01N21/65C23C18/44B82Y40/00C01G23/053G01N2021/655C01P2004/03C01P2004/61C01P2002/82
Inventor 朱储红翟海超袁玉鹏杜海威徐更生严满清江道传
Owner ANHUI UNIVERSITY
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