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Alpha molybdenum oxide nanorod gas sensitive material and preparation method and application thereof

A technology of gas-sensitive materials and molybdenum oxide, which is applied in the fields of molybdenum oxide/molybdenum hydroxide, material resistance, nanotechnology, etc., to achieve the effects of low experimental temperature, simple equipment, and convenient operation

Inactive Publication Date: 2013-10-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention adopts a simple and rapid hydrothermal method to prepare one-dimensional molybdenum oxide nanorods, and applies it to a carbon monoxide gas sensor, which has high sensitivity to the detection of carbon monoxide, which has not been reported yet

Method used

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  • Alpha molybdenum oxide nanorod gas sensitive material and preparation method and application thereof
  • Alpha molybdenum oxide nanorod gas sensitive material and preparation method and application thereof
  • Alpha molybdenum oxide nanorod gas sensitive material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Accurately weigh 0.3g of ammonium molybdate and add it into 5ml of deionized water, and fully dissolve it by electromagnetic stirring. Slowly drop 20ml of concentrated nitric acid under the condition of electromagnetic stirring. After stirring evenly, the Erlenmeyer flask was placed in a water bath with magnetic stirring, and stirred at 85°C for 0.5h. After the stirring was stopped, the temperature was continued at 85°C for 1h. After the reaction, the obtained white precipitate was centrifuged and washed twice with deionized water, then once with absolute ethanol, and the obtained powder was dried in an oven at 60°C for 12 hours to obtain nano-oxidized Molybdenum powder.

[0031] The scanning electron microscopy results of the figure 1 and figure 2 , the diameter of molybdenum oxide nanorods is 30-60nm, and the length is 1.5-2.0μm; the XRD analysis results of the prepared molybdenum oxide powder are shown in image 3 , the obtained product is an orthorhombic molybd...

Embodiment 2

[0033] Accurately weigh 0.3g of ammonium molybdate and add it into 5ml of deionized water, and fully dissolve it by electromagnetic stirring. Slowly drop 15ml of concentrated nitric acid under the condition of electromagnetic stirring. After stirring evenly, the Erlenmeyer flask was placed in a water bath with magnetic stirring, and stirred for 1 h at 80 ° C. After the stirring was stopped, it was continued to insulate at 80 ° C for 1.5 h. After the reaction, the obtained white precipitate was centrifuged and washed in the same manner as in Example 1, and the obtained powder was dried in a 60° C. oven for 12 hours to obtain nanometer molybdenum oxide powder.

Embodiment 3

[0035] Accurately weigh 0.5g of ammonium molybdate and add it into 5ml of deionized water, and fully dissolve it by electromagnetic stirring. Slowly drop 20ml of concentrated nitric acid under the condition of electromagnetic stirring. After stirring evenly, the Erlenmeyer flask was placed in a water bath with magnetic stirring, and stirred at 85°C for 0.5h. After the stirring was stopped, the temperature was continued at 85°C for 1h. After the reaction, the obtained white precipitate was centrifuged and washed in the same manner as in Example 1, and the obtained powder was dried in a 60° C. oven for 12 hours to obtain nanometer molybdenum oxide powder.

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Abstract

The invention provides an alpha molybdenum oxide nanorod gas sensitive material and a preparation method and application thereof. According to the method, a quadrature phase molybdenum oxide nanorod is successfully prepared through a simple and rapid hydrothermal method, the diameter of the molybdenum oxide nanorod is 30-60nm, the length thereof is 1.5-2.0mu m, the draw ratio can reach about 33-45, and the surface growth is smooth. Compared with prior art, the method has the advantages of simple equipment, convenient operation, low experimental temperature, short synthesis period, low cost, and the like, and the prepared molybdenum oxide nanorod has high sensitivity and selectivity for CO with low concentration at low operation temperature, and is applicable to detection of trace carbon monoxide in environment.

Description

technical field [0001] The invention relates to the field of one-dimensional nanometer metal oxide preparation technology and gas sensing technology, in particular to α-type molybdenum oxide (α-MoO 3 ) nanorods and their preparation methods, and their use as sensitive materials for semiconductor gas sensors. Background technique [0002] n-type semiconducting metal oxides have attracted more and more attention due to their excellent electrical and magnetic properties, especially in the field of gas-sensing materials. Molybdenum trioxide is an n-type wide bandgap semiconductor oxide (bandgap about 3.2eV). Due to the existence of oxygen vacancies in the molybdenum trioxide crystal, the stoichiometric deviation of the compound occurs, and its charge carrier concentration is mainly determined by the concentration of defects (such as oxygen vacancies), which makes it have excellent catalytic and gas-sensing properties. When the gas is adsorbed on the compound, the lattice oxyge...

Claims

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Application Information

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IPC IPC(8): C01G39/02B82Y40/00G01N27/04
Inventor 白守礼陈超李殿卿罗瑞贤陈霭璠
Owner BEIJING UNIV OF CHEM TECH
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