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Nickel oxide/titanium dioxide nanorod composite structure gas sensor as well as preparation method and application thereof

A gas sensor, titanium dioxide technology, applied in nanotechnology, nanotechnology, nanotechnology for sensing, etc., can solve the problems of long response recovery time and low sensitivity, and achieve short response recovery time, high sensitivity and repeatability , Improve the effect of gas-sensing characteristics

Active Publication Date: 2020-09-04
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most gas sensors based on TiO2 still have low sensitivity at room temperature (the best working temperature of most TiO2 gas sensors is 100-200°C), response The disadvantage of long recovery time limits its practical application to a certain extent

Method used

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  • Nickel oxide/titanium dioxide nanorod composite structure gas sensor as well as preparation method and application thereof
  • Nickel oxide/titanium dioxide nanorod composite structure gas sensor as well as preparation method and application thereof
  • Nickel oxide/titanium dioxide nanorod composite structure gas sensor as well as preparation method and application thereof

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preparation example Construction

[0047] The present invention also provides a method for preparing the gas sensor described above, comprising the following steps:

[0048] (1) Prepare a titanium dioxide nanorod film on the surface of the substrate by hydrothermal method, and then carry out the first annealing;

[0049] (2) growing nickel oxide on the titanium dioxide nanorod film after the first annealing, and then performing the second annealing to obtain a nickel oxide / titanium dioxide nanorod composite structure layer;

[0050] (3) Preparing interdigitated electrodes on the surface of the nickel oxide / titanium dioxide nanorod composite structure to obtain a nickel oxide / titanium dioxide nanorod composite structure gas sensor.

[0051] The invention adopts a hydrothermal method to prepare a titanium dioxide nanorod thin film on the surface of a substrate, and then performs drying and first annealing in sequence. In the present invention, the substrate is preferably cleaned and dried before use; the cleanin...

Embodiment 1

[0076] Put the FTO substrate against the inner wall of polytetrafluoroethylene in the hydrothermal reactor in a V shape, and pour the precursor prepared by 30mL deionized water, 0mL absolute ethanol, 30mL concentrated hydrochloric acid and 1mL tetrabutyl titanate solution, hydrothermal reaction at 150°C for 8h to obtain TiO 2 Nanorod film, after the reaction kettle is lowered to room temperature, wash the film with deionized water, soak it in deionized water, change the water every 3 hours, soak it for 6 hours, and dry it at a constant temperature at 70°C. Annealed at 400°C for 20min in air atmosphere and then ready for use.

[0077] The precursor solution (prepared from 0.59 g of nickel chloride hexahydrate, 100 mL of deionized water and 2 mL of ammonia water) was placed in a hydrothermal reactor, and two pieces of FTO (containing TiO 2 The nanorod film faces down) in a V shape and placed on the inner wall of the polytetrafluoroethylene reactor for hydrothermal reaction, and...

Embodiment 2

[0088] Put the FTO substrate against the inner wall of polytetrafluoroethylene in the hydrothermal reactor in a V shape, and pour the precursor prepared by 28mL deionized water, 2mL absolute ethanol, 30mL concentrated hydrochloric acid and 1mL tetrabutyl titanate. Bulk solution, hydrothermal reaction at 150°C for 8h to obtain TiO 2 Nanorod film, after the reaction kettle is lowered to room temperature, wash the film with deionized water, soak it in deionized water, change the water every 3 hours, soak it for 6 hours, and dry it at a constant temperature at 70°C. Annealed at 400°C for 20min in air atmosphere and then ready for use.

[0089] The precursor solution (prepared from 0.59 g of nickel chloride hexahydrate, 100 mL of deionized water, and 2 mL of ammonia water) was placed in a hydrothermal reactor, and two pieces of FTO (containing TiO 2 The nanorod film faces down) in a V shape and placed on the inner wall of the polytetrafluoroethylene reactor for hydrothermal reacti...

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Abstract

The invention relates to the technical field of gas sensors, and provides a nickel oxide / titanium dioxide nanorod composite structure gas sensor as well as a preparation method and application thereof. The gas sensor provided by the invention comprises a substrate, a nickel oxide / titanium dioxide nanorod composite structure layer and an interdigital electrode which are sequentially contacted frombottom to top. Nickel oxide and titanium dioxide in the nickel oxide / titanium dioxide nanorod composite structure layer are compounded to form a heterojunction, so that the gas sensitivity of the sensor is improved, and the gas sensitivity of the sensor can also be improved due to the unique oxidation-reduction characteristic of the nickel oxide. The gas sensor provided by the invention is enlarged in gas concentration detection range, short in response recovery time and high in sensitivity and repeatability, has good response to gases such as hydrogen, carbon monoxide and ammonia gas, and canrealize high-sensitivity detection just at room temperature. The preparation method provided by the invention has the advantages of simple steps, low cost, strong operability and low requirements onequipment, and can be used for large-scale synthesis.

Description

technical field [0001] The invention relates to the technical field of gas sensors, in particular to a gas sensor with a nickel oxide / titanium dioxide nanorod composite structure and a preparation method and application thereof. Background technique [0002] Gas sensing research aims to create an electronic nose that can detect various gases and their concentration levels in the surrounding air, and it should have sufficient sensitivity, selectivity and repeatability. Several common gases include hydrogen, carbon monoxide, ammonia, etc. The toxic, harmful, flammable, and explosive properties of these gases have brought great safety hazards to the application, storage, and transportation of gases. Gas sensors with high sensitivity, fast response and recovery, stable performance and low cost have become an urgent need in today's industrial field. [0003] TiO 2 It is an important semiconductor functional material with wide bandgap (3.2eV for anatase and 3.0eV for rutile). A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12C23C18/12C23C14/35C23C14/18B82Y15/00B82Y30/00B82Y40/00
CPCG01N27/127C23C18/1216C23C18/1245C23C18/1295C23C14/35C23C14/185B82Y15/00B82Y30/00B82Y40/00Y02A50/20
Inventor 夏晓红张欢欢高云鲍钰文凯文·赫姆伍德
Owner HUBEI UNIV
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