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Method for preparing hydrogen sensitive element based on quadrature-phase molybdenum oxide nano-belt

A technology of sensitive components and nanobelts, applied in the direction of material resistance, etc., can solve the problems of rough nanomaterials, unsuitable for mass production, poor process repeatability, etc., and achieve low cost, short preparation cycle, good repeatability and selectivity Effect

Inactive Publication Date: 2015-02-25
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the predecessors prepared MoO 3 The shape of nanomaterials is relatively rough, and the process repeatability is poor, and some preparation methods are relatively expensive, which is not suitable for mass production

Method used

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  • Method for preparing hydrogen sensitive element based on quadrature-phase molybdenum oxide nano-belt
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  • Method for preparing hydrogen sensitive element based on quadrature-phase molybdenum oxide nano-belt

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Preparation of molybdenum oxide nanoribbons A

[0036] 1) In a 50ml reaction vessel, 2.4195g Na 2 MoO 4 2H 2 Add O to 32.75ml deionized water, the concentration of molybdenum element is about 0.305mol / L, stir slowly to fully dissolve the molybdenum salt;

[0037] 2) Under electromagnetic stirring, slowly pour 6.25ml of 65% concentrated nitric acid into the above solution to form an acid solution, and the concentration of nitric acid is 2.5mol / L;

[0038] 3) After being fully mixed, transfer the above solution to a hydrothermal reaction kettle, and react at a temperature of 120° C. for 12 hours;

[0039] 4) After the reaction is finished, air-cool the reactor to room temperature, filter and separate, and dry at 70° C. for 10 h to obtain orthorhombic phase molybdenum trioxide nanoribbon powder.

Embodiment 2

[0041] Preparation of molybdenum oxide nanoribbons B

[0042] 1) In a 50ml reaction vessel, 2.4195g Na 2 MoO 4 2H 2 Add O to 32.75ml deionized water, the concentration of molybdenum element is about 0.305mol / L, stir slowly to fully dissolve the molybdenum salt;

[0043] 2) Under electromagnetic stirring, slowly pour 6.25ml of 65% concentrated nitric acid into the above solution to form an acid solution, and the concentration of nitric acid is 2.5mol / L;

[0044] 3) After being fully mixed, transfer the above solution to a hydrothermal reaction kettle, and react at a temperature of 160°C for 12h;

[0045] 4) After the reaction is finished, air-cool the reactor to room temperature, filter and separate, and dry at 70° C. for 10 h to obtain orthorhombic phase molybdenum trioxide nanoribbon powder.

Embodiment 3

[0047] Preparation of molybdenum oxide nanoribbons C

[0048] 1) In a 50ml reaction vessel, 2.4195g Na 2 MoO 4 2H 2 Add O to 32.75ml deionized water, the concentration of molybdenum element is about 0.305mol / L, stir slowly to fully dissolve the molybdenum salt;

[0049] 2) Under electromagnetic stirring, slowly pour 6.25ml of 65% concentrated nitric acid into the above solution to form an acid solution, and the concentration of nitric acid is 2.5mol / L;

[0050] 3) After being fully mixed, transfer the above solution to a hydrothermal reaction kettle, and react at a temperature of 180°C for 12 hours;

[0051] 4) After the reaction is finished, air-cool the reactor to room temperature, filter and separate, and dry at 70° C. for 10 h to obtain orthorhombic phase molybdenum trioxide nanoribbon powder.

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Abstract

The invention provides a method for preparing a hydrogen sensitive element based on a quadrature-phase molybdenum oxide nano-belt. The method comprises the following steps: A, a quadrature-phase molybdenum oxide nano-belt powder by a hydrothermal method; B, preparing an interdigital electrode by a photolithographic mask method; and C assembling a hydrogen sensitive element, namely molybdenum oxide powder and an absolute ethyl alcohol mixed liquid, carrying out ultrasonic treatment, dropwise adding the mixed liquid into the center position of the interdigital electrode, and annealing. According to the method, Na2MoO4.2H20 is used as a raw material, the quadrature-phase molybdenum oxide nano-belt with uniform appearance is prepared by adopting the simple hydrothermal method, the using process is simple, the preparation cycle is short, the sample yield is high, and the cost is low; the nano-belt dispersed by ultrasonics is coated to the interdigital electrode to obtain the hydrogen sensitive element with excellent performance; at room temperature, the element has the characteristics of high sensitivity and quick response on low-concentration hydrogen, has excellent repeatability and selectivity on hydrogen, and can meet the requirement of quickly detecting low-concentration hydrogen.

Description

technical field [0001] The invention relates to the technical field of metal oxide one-dimensional nano-semiconductor material preparation and gas sensing, in particular to a method for preparing a hydrogen sensing element based on an orthogonal phase molybdenum oxide nanobelt. Background technique [0002] Hydrogen is known as the clean energy of the 21st century, which has the advantages of high combustion efficiency and non-polluting products. At the same time, as a reducing gas and carrier gas, it has been widely used in many fields such as chemical industry, medicine, medical treatment, aviation, metal smelting, etc., especially in the field of modern national defense. However, because the hydrogen molecule is very small, hydrogen is colorless and odorless, and it is easy to leak during actual production, transportation and use, and it is not easy to be noticed. When the hydrogen content in the air reaches 4%, an explosion will occur when encountering an open flame, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
Inventor 顾豪爽杨树林胡永明王钊王程涛熊娟
Owner HUBEI UNIV
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