Large-area growing method for single crystal titanium dioxide nano rod and application of nano rod

A technology of titanium dioxide and growth method, which is applied in the field of nanomaterials, can solve the problems of increasing process difficulty and high vacuum degree of reaction temperature, and achieve the effect of improving field enhancement factor, low turn-on electric field emission, and realizing turn-on electric field emission

Inactive Publication Date: 2013-01-30
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dry methods such as chemical (or physical) vapor deposition can effectively improve the purity and crystallization of titanium dioxide nanorods, but the reaction temperature (above 800°C) and vacuum degree (better than 10-3 Torr) Higher requirements increase the difficulty of the process

Method used

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  • Large-area growing method for single crystal titanium dioxide nano rod and application of nano rod
  • Large-area growing method for single crystal titanium dioxide nano rod and application of nano rod
  • Large-area growing method for single crystal titanium dioxide nano rod and application of nano rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]Take industrial pure titanium sheets, and clean them by ultrasonic in acetone and absolute ethanol solutions; according to the volume ratio of 1:4, respectively take concentrated hydrofluoric acid with a concentration of ≥40% and concentrated hydrochloric acid with a concentration of 36%, and mix them to form acid solution, put the cleaned titanium sheet into the acid solution, and chemically oxidize it for 3 minutes to form a titanium dioxide particle film on the surface of the titanium sheet, take out the titanium sheet, rinse it with deionized water, and blow it dry with nitrogen. SEM image, such as figure 1 As shown in the figure, granular titanium dioxide is generated on the surface of the oxidized titanium sheet. The chemically oxidized titanium sheet was used as a counter electrode in 0.1 M NiSO 4 ·6H 2 Electrochemical deposition in O solution for 180 s, metal nickel nanoparticles were deposited on the chemically oxidized titanium sheet, the DC voltage was contr...

Embodiment 2

[0045] Take industrial pure titanium sheet and clean it by ultrasonic in acetone and absolute ethanol solution in turn; according to the volume ratio of 1:8, take concentrated hydrofluoric acid with a concentration of ≥40% and concentrated hydrochloric acid with a concentration of 38%, respectively, and mix them to form acid solution, put the cleaned titanium sheet into the acid solution, and chemically oxidize it for 5 minutes to form a titanium dioxide particle film on the surface of the titanium sheet, take out the titanium sheet, rinse it with deionized water, and dry it with nitrogen; the chemically oxidized titanium sheet as a counter electrode, in 0.4 M NiSO 4 ·6H 2 Electrochemical deposition was carried out in O solution for 105 s, and metal nickel nanoparticles were deposited on the chemically oxidized titanium sheet. During the electrochemical deposition process, the DC voltage was controlled at 1.5 V. The titanium sheet was taken out, rinsed with deionized water, an...

Embodiment 3

[0047] Take industrial pure titanium sheet and clean it by ultrasonic in acetone and absolute ethanol solution in turn; take concentrated hydrofluoric acid with a concentration ≥ 40% and concentrated hydrofluoric acid with a concentration of 37% respectively according to the volume ratio 1:6, and mix them to form acid solution, put the cleaned titanium sheet into the acid solution, and chemically oxidize it for 1 min to form a titanium dioxide particle film on the surface of the titanium sheet, take out the titanium sheet, rinse it with deionized water, and dry it with nitrogen; the chemically oxidized titanium sheet as a counter electrode, in 0.25 M NiSO 4 ·6H 2 Electrochemical deposition was carried out in O solution for 200 s, and metal nickel nanoparticles were deposited on the chemically oxidized titanium sheet. During the electrochemical deposition process, the DC voltage was controlled at 1.85 V. The titanium sheet was taken out, rinsed with deionized water, and dried w...

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Abstract

The invention discloses a large-area growing method for a single crystal titanium dioxide nano rod and application of the nano rod. The method comprises the following steps of: putting a cleaned titanium sheet into acid solution, performing chemical oxidation to obtain a counter electrode, performing electrochemical deposition in NiSO4.6H2O solution to form a layer of nickel metal nano granules on the surface of the titanium sheet, and growing a single crystal titanium dioxide nano rod array structure in a reaction cavity of a chemical vapor deposition system; pre-vacuumizing the reaction cavity, and simultaneously heating; when the pressure intensity of the reaction chamber is reduced to 10 to 100 Pa, introducing hydrogen to deoxidize the nickel metal nano granules; when the temperature in the reaction cavity is raised to between 700 and 850 DEG C, stopping introducing the hydrogen, and introducing carrier gas and acetylene so that the titanium dioxide granule film is reconstructed to grow the single crystal titanium dioxide nano rod; and naturally cooling the film to room temperature to obtain the single crystal titanium dioxide nano rod. The single crystal titanium dioxide nano rod is directly used as a field emitting cold cathode. The growing method can prepare the single crystal titanium dioxide nano rod directly used as the field emitting cold cathode at low temperature under low vacuum degree.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and relates to a large-area growth method of single-crystal titanium dioxide nanorods; the invention also relates to the application of the nanorods prepared by the method. Background technique [0002] Titanium dioxide (TiO 2 ) is a wide-bandgap semiconductor material, non-toxic, and a green environmental protection material with chemical inertness and relatively small work function (4.3 eV). Its unique photosensitive, moisture sensitive, gas sensitive, photocatalytic and strong ultraviolet absorption The characteristics have been applied in solar cells, photocatalysis, and sensitive devices. In recent years, the preparation of nanostructured titanium dioxide and its field emission properties have attracted attention, and there are nanotubes, nanospheres, nanorods, etc. [0003] Titanium dioxide nanorods have good field emission properties, and field emission is widely used in micr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/16C30B29/62C01G23/047
Inventor 王成伟陈建彪李燕王建康佑民
Owner NORTHWEST NORMAL UNIVERSITY
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