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Toluene sensor based on alpha-Fe2O3/NiO heterostructure nanotube and preparation method of toluene sensor

A heterostructure, -fe2o3 technology, applied in the direction of material resistance, can solve the problems of limiting the application of NiO-based gas sensors, low sensitivity, etc., to achieve the effect of being suitable for mass production, improving sensitivity, and simple manufacturing process

Inactive Publication Date: 2015-03-04
JILIN UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although research work on gas sensors employing NiO as a sensitive material has been widely reported, however, most NiO-based gas sensors suffer from low sensitivity, which greatly limits the application of NiO-based gas sensors.

Method used

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  • Toluene sensor based on alpha-Fe2O3/NiO heterostructure nanotube and preparation method of toluene sensor
  • Toluene sensor based on alpha-Fe2O3/NiO heterostructure nanotube and preparation method of toluene sensor
  • Toluene sensor based on alpha-Fe2O3/NiO heterostructure nanotube and preparation method of toluene sensor

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Embodiment 1

[0040] Using α-Fe2O3 / NiO heterostructure nanotubes as sensitive materials to make toluene sensors, the specific manufacturing process:

[0041] 1. First, add 0.4754g of NiCl2 6H2O and 0.063g of oxalic acid into the mixed solution composed of 9mL of deionized water and 16mL of glycerin, and keep stirring until it is completely dissolved;

[0042] 2. Transfer the above solution to a reaction kettle with a volume of 40mL, and react at 150°C for 12 hours. After cooling to room temperature, wash the resulting precipitate with deionized water and ethanol for several times, and then dry it at room temperature before placing it in Calcined at 400°C for 1 hour to obtain NiO nanotube powder assembled from NiO nanoparticles;

[0043] 3. Take 10mg of the above-mentioned NiO nanotube powder and add it to 20mL deionized water, sonicate for 10 minutes to completely disperse the NiO nanotube powder in the deionized water, then add 8.6mg FeCl3·6H2O and 10.3mg Na2SO4·10H2O in sequence, and stir...

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Abstract

The invention discloses a toluene sensor based on an alpha-Fe2O3 / NiO heterostructure nanotube and a preparation method of the toluene sensor, and belongs to the technical field of semiconductor oxide gas sensors. The sensor adopts an alpha-Fe2O3 / NiO heterostructure nanotube sensitive material made with a two-step hydrothermal method, and the sensitive characteristic of the sensor to toluene is improved effectively through a heterostructure formed between alpha-Fe2O3 and NiO and synergetic catalysis action of the alpha-Fe2O3 and NiO to toluene; and besides, the sensor structurally comprises a commercially available Al2O3 insulating ceramic tube provided with two annular gold electrodes, semiconductor sensitive materials applied on the annular gold electrodes and the Al2O3 insulating ceramic tube as well as a nickel-chromium alloy heating coil penetrating through the Al2O3 insulating ceramic tube. The device is simple in process, small in size and suitable for volume production, therefore having wide application prospect in detection of toluene content in a microenvironment.

Description

technical field [0001] The invention belongs to the technical field of semiconductor oxide gas sensors, and in particular relates to a toluene gas sensor based on α-Fe2O3 / NiO heterostructure nanotubes and a preparation method thereof. Background technique [0002] People spend more than 80% of their time indoors every day. With the development of social economy and the transformation of lifestyle, more activities such as work, shopping, and entertainment are shifted from outdoors to indoors, which further increases people's indoor living time. Therefore, indoor air quality is just more important for people's health. In recent years, due to the continuous improvement of the quality of life of residents, housing decoration has gradually become popular. However, paints, coatings, furniture and other decorative materials contain a certain amount of toluene. This harmful substance is a colorless, volatile liquid with an aromatic smell similar to benzene, which is irritating to ...

Claims

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Application Information

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IPC IPC(8): G01N27/04
Inventor 卢革宇王琛孙鹏郑杰王海宇
Owner JILIN UNIV
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