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Iron-doped porous indium oxide gas sensitive material and preparation method and application thereof

A gas-sensing material and iron-doped technology, which are applied in the field of iron-doped porous indium oxide gas-sensing materials and their preparation, can solve the problems of high working temperature, poor selectivity, low sensitivity and the like, and achieve high sensitivity, uniform size, and good effect. Good results

Inactive Publication Date: 2020-02-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the shortcomings of indium oxide in the detection of low-concentration nitrogen dioxide gas, such as low sensitivity, poor selectivity, and high working temperature, the present invention aims to provide an iron-doped porous indium oxide gas-sensing material and its preparation method and application. Gas-sensing elements prepared by iron-doped porous indium oxide gas-sensing materials are sensitive to NO including low concentrations 2 The gas has the advantages of high sensitivity, excellent selectivity, etc. at low temperature, and has a fast response recovery speed

Method used

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  • Iron-doped porous indium oxide gas sensitive material and preparation method and application thereof
  • Iron-doped porous indium oxide gas sensitive material and preparation method and application thereof
  • Iron-doped porous indium oxide gas sensitive material and preparation method and application thereof

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no. 1 example

[0058] first embodiment , a preparation method of iron-doped porous indium oxide gas sensing material, comprising the following steps:

[0059] (1) 0.39g of the base material In (NO 3 ) 3 ·4.5H 2 O, 0.0175g doped phase raw material Fe(C 15 H 21 O 6 ), 0.18g organic ligand H 2 BDC was added to 75ml of organic solvent N,N-dimethylacetamide and stirred until dissolved;

[0060] (2) The clear liquid stirred in step (1) is placed in an oil bath at 100° C. for 10 min to react, so that the raw materials undergo a coordination polymerization reaction to obtain a coordination polymer of indium iron, and then the polymer is centrifuged to separate out , washed with methanol for 5 times, and dried in an oven at 80 °C.

[0061] (3) The dried coordination polymer of indium iron is calcined in a muffle furnace at 500° C. for 2 hours to obtain a powdery iron-doped porous indium oxide gas sensing material.

no. 2 example

[0062] Second Embodiment , a preparation method of iron-doped porous indium oxide gas sensing material, the same as Example 1, the difference is: in step (1), the molar ratio of the doping phase to the matrix material is 3mol%, 10mol%, and 20mol%.

no. 3 example

[0063] Third Embodiment , a preparation method of iron-doped porous indium oxide gas sensing material, comprising the following steps:

[0064] (1) 0.39g base material indium chloride, 0.0175g doped phase raw material Fe(NO 3 ) 3 , 0.09g organic ligand H 2 BDC was added to 75ml of organic solvent N,N-dimethylacetamide and stirred until dissolved;

[0065] (2) The clear liquid stirred in step (1) is placed in an oil bath at 80° C. for 20 min to react, so that the raw material undergoes a coordination polymerization reaction to obtain a coordination polymer of indium iron, and then the polymer is centrifuged to separate out , washed with methanol for 5 times, and dried in an oven at 80 °C.

[0066] (3) calcining the dried indium-iron coordination polymer at 450° C. for 2.5 hours in a muffle furnace to obtain a powdered iron-doped porous indium oxide gas sensing material.

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Abstract

The invention relates to the technical field of a NO2 gas sensitive material, and particularly relates to an iron-doped porous indium oxide gas sensitive material and a preparation method and application thereof. The gas sensitive material consists of a matrix phase and a doping phase; the matrix phase is porous indium oxide which is monodispersed porous nanorod; the porous nanorod consists of particles with a pore structure; the doping phase is an iron ion; and the doping phase is doped inside crystal lattices of the matrix phase in a form of the iron ion. The iron-doped porous indium oxide gas sensitive material disclosed by the invention effectively solves problems of low sensitivity, poor selectivity and long response recovery time for for low-concentration NO2 when pure indium oxide is used as the gas sensitive material. By tests, a gas sensitive element prepared by adopting the gas sensitive material disclosed by the invention has excellent selectivity for NO2 gas, and has high sensitivity for low-concentration NO2 gas; moreover, a working temperature drops below 100 DEG C; and the power requirement for instrument equipment is obviously reduced.

Description

technical field [0001] The present invention relates to NO 2 The technical field of gas-sensing materials, in particular, relates to an iron-doped porous indium oxide gas-sensing material and a preparation method and application thereof. Background technique [0002] The information disclosed in this Background of the Invention is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] Nitrogen dioxide (NO 2 ) gas is a brown-red, irritating, toxic gas, and is one of the main pollutants in the atmosphere. NO 2 As a typical polluting gas in industrial waste gas and domestic waste gas, gas has high chemical activity and strong corrosiveness, and can react with moisture or hydrocarbons in the air to form acid rain, photochemical smog and haze, etc. The main sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/126G01N27/127
Inventor 刘久荣刘伟杜文静吴莉莉王凤龙汪宙王琦
Owner SHANDONG UNIV
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