Graphene/aluminum oxide/titanium dioxide heterojunction material, preparation method and application thereof

A technology of titanium dioxide and graphene, applied in chemical instruments and methods, physical/chemical process catalysts, photosensitive equipment, etc., can solve the complex and difficult control methods of synthesizing functional material morphology and performance regulation, graphene agglomeration and other problems , to achieve the effect of controllable photoelectric characteristics

Pending Publication Date: 2020-10-27
南京金思博纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In most of the current preparation technologies, the methods for controlling the morphology and performance of synthetic functional materials are relatively complicated, and graphene is easy to agglomerate during the hybridization process, which is difficult to control.

Method used

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  • Graphene/aluminum oxide/titanium dioxide heterojunction material, preparation method and application thereof
  • Graphene/aluminum oxide/titanium dioxide heterojunction material, preparation method and application thereof
  • Graphene/aluminum oxide/titanium dioxide heterojunction material, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] a. Electrospinning combined with hydrothermal process was used to hydrothermally mix alumina / titania nanofibers with different contents of graphene oxide to prepare graphene / alumina / titania heterojunction composites.

[0028] First, prepare the electrospinning solution. Mix 0.6g of PVP with 4.5mL of absolute ethanol, stir magnetically at room temperature for 24 hours to obtain a uniform and transparent solution, add 5mL of acetone, 1g of aluminum acetylacetonate, 3mL of acetic acid and 1.4011mL of isopropyl titanate into the above solution, and stir at room temperature Dissolve it completely to obtain a uniform and transparent spinning solution. The resulting PVP / aluminum acetylacetonate / isopropyl titanate fibers were collected under the conditions of a voltage of 17.5kV, a distance between the metal needle and the metal mesh of 12.5cm, a flow rate of 0.5mL / h, and a spinning humidity of 50% or less. The fibers were calcined in a muffle furnace at 600°C for 290min with ...

Embodiment 2

[0037] a. Electrospinning combined with hydrothermal process was used to hydrothermally mix alumina / titania nanofibers with 10 wt.% graphene oxide to prepare graphene / alumina / titania heterojunction composites.

[0038] First, prepare the electrospinning solution. Mix 0.6g of PVP with 4.5mL of absolute ethanol, stir magnetically at room temperature for 24 hours to obtain a uniform and transparent solution, add 5mL of acetone, aluminum acetylacetonate, 3mL of acetic acid and 2.5mL of isopropyl titanate to the above solution in sequence, and stir at room temperature to make It dissolves completely to obtain a uniform and transparent spinning solution. Wherein the quality of adding aluminum acetylacetonate is respectively 0.4625g and 1.0407g. The resulting PVP / aluminum acetylacetonate / isopropyl titanate fibers were collected under the conditions of a voltage of 17.5kV, a distance between the metal needle and the metal mesh of 12.5cm, a flow rate of 0.5mL / h, and a spinning humidit...

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Abstract

The invention discloses a graphene / aluminum oxide / titanium dioxide heterojunction material, a preparation method and application thereof. The preparation method comprises the following steps of: dissolving polyvinylpyrrolidone into anhydrous ethanol to serve as an electrospinning precursor solution; adding a substance source of a ceramic material, a corresponding solvent and an auxiliary agent into the precursor solution, collecting electrospun fibers under a certain condition, and roasting the electrospun fibers in air at 600DEG C to obtain the ceramic nanofibers; subjecting the obtained fibers to hydrothermal reaction with a GO solution, and regulating and controlling the growth morphology of a heterostructure by adjusting the content of GO and utilizing the interaction of an oxygen-containing functional group of GO and the heterojunction in a hydrothermal environment. The obtained material is used as a photo-anode in a traditional three-electrode system, and controllable and optimized photoelectric properties are shown. According to the method, complex chemical control is not involved, a surfactant is not introduced, a time-consuming treatment procedure is not involved, the method belongs to a green, efficient and sustainable process, and a new method can be provided for preparing the functional nano material with controllable morphology and optimized performance.

Description

technical field [0001] The invention belongs to the technical field of regulation and control of titania-based heterojunction composite materials, and in particular relates to a graphene / alumina / titania heterojunction material and its preparation method and application. Background technique [0002] Titanium dioxide-based semiconductor materials have attracted much attention in the fields of environmental protection and photocatalytic energy conversion. Titanium dioxide nanofibers prepared by electrospinning have unique properties such as porosity and high specific surface area, which are conducive to promoting carrier transfer and electron transport, but the narrow absorption range limits its application in the field of optoelectronics. Designing titania-based heterostructures with controllable structure and morphology is one of the effective strategies. However, most preparation techniques require the addition of surfactants and time-consuming and complicated post-processi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J21/04H01G9/20H01G9/042
CPCB01J21/18B01J21/04B01J21/063H01G9/2036B01J35/39B01J35/33Y02E10/542
Inventor 代云茜詹琦武亚南王云鹏刘苏婷孟祥钰孙岳明
Owner 南京金思博纳米科技有限公司
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