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Preparation of silver/cadmium sulfide-nanoparticle-comodified titanium dioxide nanotube array

A technology of nanotube arrays and titanium dioxide, which is applied in the field of preparation of silver and cadmium sulfide nanoparticles co-modified titanium dioxide nanotube arrays, can solve the problems of unsatisfactory photocatalysis and little improvement in photoelectric performance, and achieve easy control of reaction parameters and experimental results. The effect of low equipment requirements and high photoelectric conversion efficiency

Inactive Publication Date: 2013-03-13
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] to TiO 2 The single modification of nanotubes has entered the bottleneck period. Although considerable progress has been made in the modification of light absorption, the rapid recombination of holes and electrons caused by this has led to little improvement in its photoelectric performance, which cannot meet the requirements of photocatalysis, DSSC, etc. , Photolysis of water and other practical application requirements

Method used

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  • Preparation of silver/cadmium sulfide-nanoparticle-comodified titanium dioxide nanotube array
  • Preparation of silver/cadmium sulfide-nanoparticle-comodified titanium dioxide nanotube array
  • Preparation of silver/cadmium sulfide-nanoparticle-comodified titanium dioxide nanotube array

Examples

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Embodiment 1

[0028] A method for co-modifying titanium dioxide nanotube arrays with silver and cadmium sulfide nanoparticles, comprising the steps of:

[0029] (1) Ultrasonic cleaning and degreasing of high-purity titanium sheets (purity ≥ 99.5%, with a thickness of 0.25 mm): ultrasonically clean the titanium sheets in acetone, methanol, and isopropanol for 10 minutes;

[0030] Removal of natural oxide film: put the cleaned titanium sheet into mixed acid (HF:HNO 3 : deionized water=1:4:5, volume ratio) in ultrasonic for 10s to remove the oxide layer;

[0031] Primary anodizing: Put the titanium sheet after removing the oxide film into the anodizing device, add 0.5wt.%NH 4The ethylene glycol solution of F and 3vol.% deionized water is the electrolyte, the oxidation voltage is 60V, the temperature of the electrolyte is room temperature, and the oxidation time is 1h;

[0032] Remove the primary oxide layer: then the prepared TiO 2 The layer was taken out, and the Ti substrate was exposed b...

Embodiment 2

[0039] The specific operations of each step in this example are the same as those in Example 1, the only difference being that in step (3), the number of times of modification of the titanium dioxide nanotubes modified with Ag nanoparticles by CdS nanoparticles is changed to 7 cycles.

[0040] figure 1 For different cycles of Ag in Examples 1 and 2, CdS nanoparticles co-modify TiO 2 Nanotube Array FESEM. It can be seen from the figure that after 3 cycles of Ag and CdS nanoparticle co-modification in step (3), it can be clearly observed that there are nanoparticles on the nozzle and inner wall, and the distribution is uniform without agglomeration, but the surface deposition The amount is relatively small. However, when increasing the number of operating cycles in step (3), after 7 cycles, TiO 2 A large number of Ag and CdS nanoparticles appeared on the surface and inner wall of the nanotube, and they agglomerated together, almost closing the tube opening.

[0041] figure...

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Abstract

The invention belongs to the field of nano material preparation, and relates to a method for comodifying a titanium dioxide nanotube array with silver and cadmium sulfide nanoparticles, which comprises the following steps: carrying out ultrasonic cleaning on a high-purity titanium sheet to remove oil, removing the natural oxide film, and carrying out secondary anodization to prepare an ordered titanium dioxide nanotube array; and treating the titanium dioxide nanotube array with a coupling agent, depositing Ag nanoparticles by an SILAR (successive ionic layer adsorption and reaction) process, and modifying the Ag-modified titanium dioxide nanotube array with CdS nanoparticles, thereby obtaining the Ag / CdS-nanoparticle-comodified titanium dioxide nanotube array. The invention is simple to operate and has the advantage of low cost; the noble metal and narrow-energy-gap semiconductor nanoparticles are utilized to comodify the titanium dioxide nanotube array, thereby effectively widening the absorption range of TiO2 in the visible light region and lowering the recombination rate of the electron-hole pair; and the invention has wide prospects in the aspects of solar cells, toxic or harmful pollutant degradation and the like.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials, and relates to a method for preparing a titanium dioxide nanotube array co-modified by silver and cadmium sulfide nanoparticles. Background technique [0002] Due to its great potential in utilizing solar energy and solving environmental pollution problems, semiconductor photocatalysis technology has attracted widespread attention at home and abroad. Among them, due to TiO 2 It is non-toxic, stable, and has outstanding photoelectric performance, which has aroused people's interest in research. TiO in various morphologies 2 Medium, TiO 2 Nanotube arrays have attracted much attention due to their structural and performance advantages such as the huge specific surface area brought by one-dimensional nanostructured materials. They are widely used in photolysis of water for hydrogen production, solar cells, supercapacitors, catalytic degradation of organic dyes in water, sensors and bio...

Claims

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Application Information

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IPC IPC(8): C25D11/26
Inventor 杨修春王青尧池丽娜
Owner TONGJI UNIV
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