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Titanium dioxide and graphene oxide composite nano-grade sheet material and preparation method thereof

A graphene composite and titanium dioxide technology, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., can solve the problems of uncontrollable particle size distribution and small size, and achieve improved photoelectric effect efficiency and continuous controllable thickness , Ease of large-scale production

Active Publication Date: 2013-09-18
SICHUAN UNIV +1
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Problems solved by technology

The biggest shortcoming of this method is that the size of the prepared titanium dioxide nanosheets is very small, often less than tens of nanometers.
However, these two methods prepare granular titanium dioxide, and the particle size of titanium dioxide and the distribution of titanium dioxide on graphene oxide or graphene are uncontrollable.

Method used

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  • Titanium dioxide and graphene oxide composite nano-grade sheet material and preparation method thereof
  • Titanium dioxide and graphene oxide composite nano-grade sheet material and preparation method thereof
  • Titanium dioxide and graphene oxide composite nano-grade sheet material and preparation method thereof

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preparation example Construction

[0039] The preparation method of above-mentioned titanium dioxide and graphene oxide composite nanosheet material, its flow chart is as follows Figure 4 shown, including the following steps:

[0040] Step 1. Ultrasonic vibration of graphene oxide at room temperature to uniformly disperse it in distilled water to prepare a graphene oxide dispersion with a concentration of 6-7 mg / mL.

[0041] Step 2. Dilute the graphene oxide dispersion to 2-5 mg / mL with absolute ethanol.

[0042] Step 3. Dissolving an appropriate amount of butyl titanate in 2-5 mL of absolute ethanol to prepare a butyl titanate ethanol solution with a concentration of 4.2-84 mg / mL.

[0043] Step 4, adding different concentrations of butyl titanate ethanol solutions dropwise to the graphene oxide ethanol dilution solution at a temperature of 20-60° C. and stirring.

[0044] Step 5, reacting for 2-8 hours to obtain a dispersion of amorphous titanium dioxide and graphene oxide composite nanosheet material.

[...

Embodiment 1

[0053] Graphene oxide was ultrasonically oscillated at room temperature to uniformly disperse it in distilled water to obtain a graphene oxide dispersion with a concentration of 7 mg / mL. Take 1.4 mL of graphene oxide dispersion and dilute it to 20 mL with absolute ethanol. After ultrasonic dispersion, transfer to 50mL flask, placed in a 20°C water bath and stirred. Weigh about 40mg of butyl titanate and dissolve it in 2mL of absolute ethanol, and then add it dropwise into a 50mL flask. Keep the reaction for 4 hours after dropping to obtain a bright brown dispersion of amorphous titanium dioxide and graphene oxide composite nanosheets. After the dispersion was left to stand for 2 months, it was divided into upper and lower layers, the transparent upper layer accounted for a very small part, and the lower layer was still brown and less viscous (see Figure 1A ).

[0054] After washing with absolute ethanol, it was vacuum-dried at room temperature to obtain a dark brown powder. ...

Embodiment 2

[0056] Ultrasonic vibration of graphene oxide at room temperature to uniformly disperse it in distilled water to obtain a graphene oxide dispersion with a concentration of 6.7mg / mL, take 1.5mL of graphene oxide dispersion and dilute it to 20mL with absolute ethanol, and transfer it after ultrasonic dispersion To a 50mL flask, placed in a 60°C water bath and stirred. Weigh about 210mg of butyl titanate and dissolve it in 5mL of absolute ethanol, and then add it dropwise into a 50mL flask. After dropping, the reaction was kept for 2 hours to obtain a brown dispersion of amorphous titanium dioxide and graphene oxide composite nanosheets. After the dispersion was left to stand for 2 months, it was divided into upper and lower layers, the transparent upper layer accounted for a small part, and the lower layer was still brown but with a higher viscosity (see Figure 1B ).

[0057] After washing with absolute ethanol, it was vacuum-dried at room temperature to obtain a brown powder...

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Abstract

The invention relates to a titanium dioxide and graphene oxide composite nano-grade sheet material and a preparation method thereof. A structural layer of the titanium dioxide and graphene oxide composite nano-grade sheet comprises a graphene oxide layer, and two titanium dioxide layers respectively positioned on the upper and lower sides of the graphene oxide layer. The preparation method comprises steps that: step 1, graphene oxide is subject to ultrasonic oscillation under a normal temperature, such that graphene oxide is uniformly dispersed in distilled water, and a graphene oxide dispersed liquid is obtained; step 2, the graphene oxide dispersed liquid is diluted by using absolute alcohol; step 3, a proper amount of tetrabutyl titanate is dissolved in absolute alcohol, such that an alcohol solution of tetrabutyl titanate is obtained; step 4, the alcohol solution of tetrabutyl titanate with a different concentration is gradually dropped into the alcohol diluent of graphene oxide with a temperature of 20-60 DEG C while stirring; step 5, a reaction is carried out, such that a dispersed liquid of an amorphous titanium dioxide and graphene oxide composite nano-grade sheet material is obtained; step 6, the dispersed liquid is subject to centrifugal washing by using distilled water and absolute alcohol, and is subject to normal-temperature vacuum drying, such that powder is obtained. The powder is the amorphous titanium dioxide and graphene oxide composite nano-grade sheet material obtained with the initial reaction.

Description

technical field [0001] The invention relates to the technical field of inorganic nanocomposite materials and their preparation, in particular to a titanium dioxide and graphene oxide composite nanosheet material with a thickness controllable sandwich structure and a preparation method thereof. Background technique [0002] Because of their high surface area and ease of fabrication into nanodevices, 2D inorganic nanomaterials are widely used in catalysis, solar cells, and various optical and electronic devices. [0003] Graphene, as a monolithic graphite structure, is currently the thinnest two-dimensional material in the world. Due to its very stable structure, it is the material with the highest specific strength that can be prepared at present, and its specific surface area is as high as 2600m 2 / g, has special electromagnetic properties, extremely high electrical conductivity and thermal conductivity (4,800~5,300W / m·k). Since its discovery in 2004, graphene has shown ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/46C09C3/06C09C3/04
Inventor 傅强苏晓声陈枫杨中强姚威威柴颂刚
Owner SICHUAN UNIV
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