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Vertically grown TiO2 nanosheet and preparation method thereof

A vertical growth, nanosheet technology, applied in the field of nanomaterials, can solve the problems of less surface active groups and uneven surface of carbon-based electrodes, and achieve good biocompatibility, high electrical energy conversion rate, and low chemical stability. Effect

Inactive Publication Date: 2015-01-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, nano-TiO modified on carbon electrodes 2 The morphology mainly includes nanoparticles, nanorods, nanosheets, etc. However, due to the uneven surface of carbon-based electrodes and few surface active groups, most of the modification methods use physical methods such as bonding, compression, and smearing to form disordered TiO on the surface. 2 Nano-structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Take 40ml of 10M sodium hydroxide solution and pour it into a polytetrafluoroethylene reactor with a volume of 50ml, then add 0.2g of activated carbon powder, stir evenly, and put it vertically 2 The carbon-based electrode of the sol seed layer particles was hydrothermally reacted at 180°C for 24 hours. After the reaction, the sample was taken out and rinsed repeatedly with ultrapure water, then soaked in 0.1M hydrochloric acid until neutral, dried at 80°C and placed in N 2 Calcined at 550 °C for 1 h in the atmosphere to obtain anatase-type TiO grown on the surface of vertical carbon-based electrodes 2 Nanosheets.

Embodiment 2

[0018] Example 2: Take 40ml of 10M sodium hydroxide solution and pour it into a polytetrafluoroethylene reactor with a volume of 50ml, then add 0.3g of carbon nanotubes, stir evenly, and put them vertically with TiO 2 The carbon-based electrode of the sol seed layer particles was subjected to a hydrothermal reaction at 200°C for 28 hours. After the reaction, the sample was taken out and rinsed repeatedly with ultrapure water, then soaked in 0.1M hydrochloric acid until neutral, dried at 80°C and placed in N 2 Calcined at 700°C for 2 hours in the atmosphere to obtain TiO grown on the surface of vertical carbon-based electrodes in the mixed crystal form of anatase and rutile 2 Nanosheets.

Embodiment 3

[0019] Example 3: Take 40ml of 10M sodium hydroxide solution and pour it into a polytetrafluoroethylene reactor with a volume of 50ml, then add 0.3g of activated carbon particles, stir evenly, and put it vertically with TiO 2 The carbon-based electrode of the sol seed layer particles was hydrothermally reacted at 150°C for 32h. After the reaction, the sample was taken out and rinsed repeatedly with ultrapure water, then soaked in 0.1M hydrochloric acid until neutral, dried at 80°C and placed in N 2 Calcined at 500°C for 2 hours in the atmosphere to obtain anatase-type TiO grown on the surface of vertical carbon-based electrodes 2 Nanosheets.

[0020] Prepared TiO 2 The nanosheets grow uniformly on the surface of the carbon-based electrode, with a length of about 2-5 μm and a width of 200-600 nm. The density can be controlled by the thickness of the seed layer adsorbed on the surface according to actual needs.

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Abstract

The invention relates to a TiO2 nanosheet vertically growing on the surface of a carbon-based electrode and a preparation method of the TiO2 nanosheet and belongs to the technical field of the nanomaterials. The preparation method of the TiO2 nanosheet comprises the following four steps: performing pretreatment on a substrate; performing an in-situ hydrothermal reaction on the pretreated substrate in a sodium hydroxide solution, which is a process of dissolution and recrystallization, and adding a certain amount of structural inducer to form a nanosheet array evenly grown in such a manner of being perpendicular to the surface of the substrate; performing washing and acid soaking, namely repeatedly washing the generated TiO2 nanosheet by use of ultrapure water after the reaction is completed and soaking the TiO2 nanosheet in an acid until the TiO2 nanosheet is neutral; and calcining for a while at a certain temperature in an N2 protection atmosphere to obtain the single-crystal vertically grown TiO2 nanosheet. The TiO2 nanosheet has excellent biocompatibility, stability and environmental friendliness; the preparation method is simple; the vertically grown TiO2 nanosheet is capable of reducing the resistance to electron transfer and can be applied to a microbial fuel cell (MFC) to improve electric quantity output.

Description

technical field [0001] The invention relates to a TiO grown vertically on various carbon substrates 2 The nanosheet and its preparation method belong to the technical field of nanomaterials. Background technique [0002] TiO 2 Semiconductor nanomaterials have good application prospects in photocatalysis, solar cells, and gas sensing due to their excellent photoelectric properties, stable chemical properties, and non-toxicity. TiO 2 The preparation methods of nanomaterials generally include hydrothermal method, precipitation method, template method, sol-gel method and self-assembly method. Different synthesis methods can obtain TiO with different morphologies 2 Nanomaterials, the most common shapes of which are mesoporous spheres, nanotubes, nanowires, nanosheets, and three-dimensional mesoporous microspheres assembled from two-dimensional structures. Modification of semiconductor nanostructures on electrodes can improve the performance of electrodes and is widely used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/50
Inventor 付德刚银涛
Owner SOUTHEAST UNIV
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