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Magnéli phase titanium oxide nanowire array and preparation method thereof

A nanowire array, phase titanium oxide technology, applied in titanium dioxide, titanium oxide/hydroxide, nanotechnology and other directions, can solve problems such as inability to effectively utilize natural light, and achieve high practical value, novel synthesis methods, and rich raw material sources. Effect

Inactive Publication Date: 2016-05-25
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Titanium dioxide has been widely studied as a very ideal material in the photocatalytic degradation of organic matter and photocatalytic electrolysis of water, but titanium dioxide is a semiconductor with a wide bandgap. Even the anatase structure with the smallest bandgap has a bandgap of up to 3.0eV, only has a strong absorption of ultraviolet light with a wavelength of less than 400nm, and hardly absorbs light waves with a wavelength greater than 400nm, and cannot effectively use natural light

Method used

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  • Magnéli phase titanium oxide nanowire array and preparation method thereof
  • Magnéli phase titanium oxide nanowire array and preparation method thereof
  • Magnéli phase titanium oxide nanowire array and preparation method thereof

Examples

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Embodiment 1

[0024] (1) if figure 1 As mentioned above, take the length and width as 2×6cm 2 Titanium sheet folded into figure 1 The shape shown was ultrasonically cleaned with acetone for 30 minutes, then ultrasonically cleaned with deionized water, and then etched with a mixed acid solution of hydrofluoric acid: nitric acid: deionized water with a volume ratio of 1:3:6 for one minute, and finally Ultrasonic cleaning and drying with deionized water to obtain titanium metal sheets with clean surfaces;

[0025] (2) Put the corundum boat containing 2 grams of titanium dioxide powder and the metal titanium sheet etched in step (1) into the tube furnace together, and place it as figure 1 shown;

[0026] (3) Pre-flow nitrogen for 2 hours at a nitrogen flow rate of 100mL / min, turn off the nitrogen gas, and pass hydrogen gas for 30 minutes at a hydrogen flow rate of 100mL / min. Then, adjust the hydrogen flow rate to 50mL / min, raise the temperature to 1050°C at a rate of 8°C / min, keep it war...

Embodiment 2

[0030] The difference between this example and Example 1 is that 10% oxalic acid solution is used and etched at 100°C for 2 hours. The other steps are the same as in Example 1. The obtained Magnéli phase titanium oxide nanowire is similar to the product of Example 1. Its XRD pattern and scan Electron microscope pictures can refer to figure 2 , image 3 .

Embodiment 3

[0032] The difference between this example and Example 1 is that the hydrogen flow rate is adjusted to 20mL / min during heat preservation, and the other steps are the same as in Example 1. The obtained Magnéli phase titanium oxide nanowires have a morphology similar to that of the product in Example 1, and the diameter ratio is slightly smaller than that of the product in Example 1. Nanowire, its XRD diagram and scanning electron microscope diagram can refer to figure 2 , image 3 .

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Abstract

The invention discloses a Magneli phase titanium oxide nanowire array and a preparation method thereof. The component of the prepared array is a Magnel phase Ti8O15 nanowire, wherein the diameter of the nanowire is 20-100nm and the length of the nanowire is 50nm-5 microns. The preparation method comprises the following main steps: etching and cleaning the surface of metallic titanium; and by taking metallic titanium oxide as an oxygen source, treating titanium oxide powder at a high temperature in a hydrogen atmosphere, and cooling to form a black film on the surface of metallic titanium to obtain the material. The method disclosed by the invention is simple in preparation process and low in cost, and the prepared Magneli phase titanium oxide nanowire array can be used as an electrode material, an electrode supporting material and a catalyst carrier material and has a wide application prospect in the electrochemical and photoelectrochemical fields.

Description

technical field [0001] The invention relates to a Magnéli phase titania nanowire array and a preparation method thereof, belonging to the field of nanometer material science. Background technique [0002] Magnéli phase titanium oxide is a general term for a series of non-stoichiometric titanium oxides, and its general formula can be expressed as Ti n o 2n-1 (4≤n≤9), including Ti 4 o 7 , Ti 5 o 9 , Ti 6 o 11 , Ti 7 o 13 , Ti 8 o 15 , Ti 9 o 17 and other compounds. Magnéli phase titanium oxide is not a dopant of titanium dioxide or TiO x (x<2), but a non-stoichiometric titanium oxide with stable crystal structure. Ti n o 2n-1 The crystal structure can be considered to be based on rutile titanium dioxide as the matrix, and every n layer is composed of an oxygen-deficient layer. Due to its unique crystal structure, it exhibits physical, chemical and electrochemical properties completely different from titanium dioxide, including high electrical conductivity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/08B82Y30/00B82Y40/00
Inventor 沈培康长世勇
Owner SUN YAT SEN UNIV
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