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Preparation method for two-dimensional sheet-shaped titanium dioxide nanosheet material

A technology of titanium dioxide and nanosheets, which is applied in the field of two-dimensional sheet titanium dioxide nanomaterials and its preparation, can solve the problems of complex process flow, easy agglomeration of nanopowder, and difficult operation, and achieve stable process parameters, good crystallinity, and simple process Effect

Inactive Publication Date: 2014-10-08
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned methods all have the problems of complex technological process and numerous steps, and in order to control the crystal form of titanium dioxide in the preparation process, it is often necessary to add a variety of crystal form control agents, which introduces too many impurities, the purity is correspondingly low, and the quality of the finished product is relatively low. Not high; the most commonly used low-cost titanium source titanium tetrachloride is extremely volatile, difficult to operate, and easy to pollute the environment
The nano-powder made is easy to agglomerate, and it is difficult to achieve the good effect expected by theory

Method used

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  • Preparation method for two-dimensional sheet-shaped titanium dioxide nanosheet material
  • Preparation method for two-dimensional sheet-shaped titanium dioxide nanosheet material

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Three-dimensional layered Ti with a particle size of 100 mesh 3 AlC 2 Soak 6g of the powder into 100ml of 45wt% HF aqueous solution at room temperature, and stir magnetically at 1000r / min for 20 hours to obtain a suspension. Leave the suspension to separate layers, remove the supernatant with a straw, and then add 100ml of water, then stir evenly, then let it stand until the layers are separated, use a straw to remove the supernatant, then add about 100ml of water, stir evenly, and then centrifuge at 3000r / min for 30min to remove large particles. Then centrifuge at 8000r / min for 10min, collect the powder and dry it. Place the dried powder in an alumina crucible (other ceramic crucibles are also available, such as zirconia crucibles, as long as they can be used at 1000 ° C and do not react with the powder, the same is true in the remaining embodiments), and then Place the crucible in a clean tube furnace. The vacuum degree of the tube furnace is set to 5Pa, the heating...

Embodiment 2

[0027] Three-dimensional layered Ti with a particle size of 250 mesh 3 AlC 2Soak 8g of the powder in 100ml of 55wt% HF aqueous solution at room temperature, and stir magnetically at 2500r / min for 30 hours to obtain a suspension. Leave the suspension to separate layers, suck off the supernatant with a straw, and then add to the precipitate Add 80ml of water to the sediment, then stir evenly, then let it stand until the layers are separated, suck the supernatant with a straw, then add about 80ml of water to the sediment, stir evenly, let it stand again until the layers are separated, and suck up the supernatant with a straw. Remove the supernatant, then add about 80ml of water to the sediment, centrifuge at 4500r / min for 20min to remove large particles, then centrifuge at 9500r / min for 20min, collect the powder and dry it. Put the dried powder in an alumina crucible, and then put it into a clean tube furnace. The vacuum degree of the tube furnace is set to 15Pa, the temperature...

Embodiment 3

[0029] Three-dimensional layered Ti with particle size less than 200 mesh 3 AlC 2 Soak 8g of the powder in 100ml of 50wt% HF aqueous solution at room temperature, stir magnetically at 3000r / min for 20 hours to obtain a suspension, leave the suspension to separate layers, use a straw to remove the supernatant, and then add to the sediment Add 100ml of water, then stir evenly, then let it stand until the layers are separated, use a straw to remove the supernatant, then add about 100ml of water, stir evenly, centrifuge at 4000r / min for 20min to remove large particles, then 9000r / min Centrifuge for 20 min, collect the powder and dry it. Put the dried powder in an alumina crucible, and then put it into a clean tube furnace. The vacuum degree of the tube furnace is set to 10Pa, the temperature rise rate is 10°C / min, the temperature is raised to 750°C, and then passed through different The inlet pipe is fed with argon and oxygen mixed gas, the total pressure in the furnace is 800Pa...

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Abstract

The invention discloses a preparation method for a two-dimensional sheet-shaped titanium dioxide nanosheet material. The preparation method comprises the following steps: soaking three-dimensional laminated Ti3AlC2 powder in an aqueous solution of HF at a room temperature, and removing an Al atom layer by use of a chemical liquid-phase dissection method to prepare a two-dimensional Ti3C2 nanosheet with laminated characteristics still kept; then, placing Ti3C2 in a tubular furnace, ventilating a gas mixture of flowing oxygen gas and argon gas after vacuumizing, realizing in-situ oxidization of the two-dimensional Ti3C2 nanosheet at a high temperature, then cooling, taking out powder, and grinding to obtain the TiO2 nanosheet. According to the preparation method disclosed by the invention, any organic solvent and additive are not needed to be added in the preparation process, process parameters are stable, the procedure is simple, the process is controllable, the efficiency is high and the cost is low; the prepared two-dimensional titanium dioxide nanosheet has transverse dimension of 5-10 microns, and single-layer average thickness of 50 nanometers; the prepared rutile type titanium dioxide nanosheet is high in purity and good in degree of crystallinity, and only contains very little antase phase.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, and in particular relates to a two-dimensional flaky titanium dioxide nanomaterial and a preparation method thereof. Background technique [0002] Ultrathin two-dimensional nanosheets have strong catalytic performance, photovoltaic performance and electrochemical performance due to their unique morphology, small particle size, large surface-to-volume ratio, and atomic-level layer thickness. Ceramics, photocatalysis, lithium-ion batteries, solar cells, gas sensors, etc. have been widely used. For example, due to its high carrier mobility, good mechanical flexibility and optical transparency, and excellent chemical stability, graphene has made this two-dimensional nanostructured material widely used in field-effect transistors, flexible transparent electrodes, touch screens, etc. , new composite materials, sensors, catalyst carriers, energy storage devices and other fields have shown broad ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/08B82Y30/00B82Y40/00
Inventor 张建峰王红兵吴玉萍
Owner HOHAI UNIV
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