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Preparation method and application of n-p junction type ferrum-copper based oxide gas sensitive element

A gas-sensing element, iron-copper-based technology, which is applied in the field of preparation of n-p junction iron-copper-based oxide gas-sensing elements, can solve the problems of no technical enlightenment, no disclosure, etc., and achieve good synergistic sensitization effect and heat capacity. large, avoid the effect of mutual influence

Inactive Publication Date: 2014-03-19
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] It can be seen that the patent only discloses that the N-P structure can be used to make a sintered side-heating gas sensor, and it does not disclose the use of monodisperse mesoporous ferric oxide nanomaterials and cuprous oxide nanomaterials to prepare iron-copper-based oxides Fe 3 o 4 Cu 2 O is used as a gas-sensing material, and there is no technical inspiration for applying this technical feature

Method used

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  • Preparation method and application of n-p junction type ferrum-copper based oxide gas sensitive element
  • Preparation method and application of n-p junction type ferrum-copper based oxide gas sensitive element

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Experimental program
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Effect test

Embodiment 1

[0034] (1) Preparation of monodisperse mesoporous Fe3O4 nanomaterials: 0.8 g FeCl 3 ?6H 2O was dissolved in 18 mL of ethylene glycol solution to form a transparent solution, then 2.6 g of anhydrous NaAc and 9.0 mL of ethylenediamine were added, the mixture was fully stirred for 32 min, and it was packaged in a polytetrafluoroethylene reactor and heated at 200 After 6.0 h at ℃, cool to room temperature, wash the black solid with water several times until neutral, and dry the solid in a vacuum oven at 50 °C for 8.5 h to obtain monodisperse mesoporous ferric oxide nanoparticles; The ethylenediamine is excessive, and the excess ethylenediamine makes the surface of ferric oxide contain 0.1 μg / mg of amino groups; the pore diameter of the monodisperse mesoporous ferric oxide nanoparticles is 3 nm.

[0035] (2) Preparation of cuprous oxide nanomaterials: 0.5 mL, 0.68 mol / L CuSO 4 and 0.7 g of polyvinylpyrrolidone K30 (PVP K30) were dissolved in 15 mL of ultrapure water, added to a r...

Embodiment 2

[0038] (1) Preparation of monodisperse mesoporous Fe3O4 nanomaterials: 0.9 g FeCl 3 ?6H 2 O was dissolved in 18 mL of ethylene glycol solution to form a transparent solution, then 2.7 g of anhydrous NaAc and 9.2 mL of ethylenediamine were added, the mixture was fully stirred for 33 min, and it was packaged in a polytetrafluoroethylene reactor and heated at 200 After 6.5 h at ℃, cool to room temperature, wash the black solid with water several times until neutral, and dry the solid in a vacuum oven at 50 °C for 9.0 h to obtain monodisperse mesoporous ferric oxide nanoparticles; The ethylenediamine is in excess, and the excess ethylenediamine makes the surface of ferric oxide contain 0.15 μg / mg of amino groups; the pore size of the monodisperse mesoporous ferric oxide nanoparticles is 12 nm.

[0039] (2) Preparation of cuprous oxide nanomaterials: 0.6 mL, 0.68 mol / L CuSO 4 and 0.8 g of polyvinylpyrrolidone K30 (PVP K30) were dissolved in 16 mL of ultrapure water, added to a ro...

Embodiment 3

[0042] (1) Preparation of monodisperse mesoporous iron oxide nanomaterials: 1.0 g FeCl 3 ?6H 2 O was dissolved in 18 mL of ethylene glycol solution to form a transparent solution, then 2.6 g of anhydrous NaAc and 9.4 mL of ethylenediamine were added, the mixture was fully stirred for 33 min, and it was packaged in a polytetrafluoroethylene reactor and heated at 200 After 7.0 h at ℃, cool to room temperature, wash the black solid with water several times until neutral, and dry the solid in a vacuum oven at 50 °C for 9.0 h to obtain monodisperse mesoporous ferric oxide nanoparticles; The ethylenediamine is excessive, and the excess ethylenediamine makes the surface of ferric oxide contain 0.2 μg / mg of amino groups; the pore diameter of the monodisperse mesoporous ferric oxide nanoparticles is 8 nm.

[0043] (2) Preparation of cuprous oxide nanomaterials: 0.7 mL, 0.68 mol / L CuSO 4 and 0.75 g of polyvinylpyrrolidone K30 (PVP K30) were dissolved in 15 mL of ultrapure water, added...

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Abstract

The invention relates to a preparation method and application of an n-p junction type ferrum-copper based oxide gas sensitive element. A gas sensor adopts a heater type device structure and takes an alumina ceramic tube as a carrier. A forked gold electrode is applied to the outer surface of the gas sensor. Platinum extraction electrodes are arranged at the two ends of the gas sensor. A heater strip is arranged in the ceramic tube. A gas sensitive material is coated on the outside the ceramic tube and is an n type semiconductor ferroferric oxide and p type semiconductor cuprous oxide porous compound. The gas sensor is prepared by preparing the alumina ceramic tube on which the material is coated into a tube core and then welding, packaging and electrically aging the tube core according to the conventional process of a heater type device. The preparation method is simple in process, mild in conditions and low in cost and is especially suitable for volume production. The prepared gas sensitive element is used for detecting the ethanol concentration at 200-300 DEG C, has the characteristics of high response sensitivity to 1-1800ppm ethanol, good restorability, quick response and the like and can be used for determining ethanol concentration in industrial and agricultural production and environment detection.

Description

technical field [0001] The invention relates to a preparation method and application of an n-p junction type iron-copper-based oxide gas sensor, and belongs to the field of preparation technology of functional materials and metal oxide semiconductor gas sensors. Background technique [0002] Among all kinds of gas sensors, instrument detection has the advantages of high sensitivity and high accuracy, but its application is limited due to the large size of the instrument, high price, and cumbersome test preparation work, which is not conducive to real-time monitoring on site; The sensor can not only meet the sensitivity and accuracy required by general detection, but also has the advantages of small size, simple operation, easy to carry, can be used for on-site monitoring and low price. Therefore, in the existing various gas detection sensors, the side-heating gas sensor occupies a very important position, and it has attracted more and more attention from experts and scholars...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00
Inventor 魏琴杜斌冯锐闫良国李贺张勇吴丹于海琴王玉兰吕晓辉
Owner UNIV OF JINAN
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