Composite resistance NH3 gas-sensitive gas sensor and preparation method thereof

A gas sensor and composite resistance technology, applied in the direction of material resistance, etc., can solve the problems of high energy consumption and high working temperature, and achieve the effects of simple preparation method, lower working temperature, and improved sensitivity

Inactive Publication Date: 2011-09-07
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] The purpose of the present invention is to provide a composite resistance type NH 3 Gas sensitive gas sensor and preparation m

Method used

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  • Composite resistance NH3 gas-sensitive gas sensor and preparation method thereof
  • Composite resistance NH3 gas-sensitive gas sensor and preparation method thereof
  • Composite resistance NH3 gas-sensitive gas sensor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Embodiment 1: A composite resistive NH 3 Gas sensitive gas sensor, it is prepared by following scheme:

[0041] (1) Material preparation

[0042] (1) The specific method for preparing polyaniline nanotubes is:

[0043] Include the following steps in turn:

[0044] (a) purifying aniline through secondary distillation in the presence of zinc powder;

[0045] (b) 2mol / l freshly distilled aniline is dissolved in 1mol / L hydrochloric acid;

[0046] (c) Slowly add 2 mol / l (NH4)2S2O8 solution dropwise therein under stirring state, the dropwise addition time is about 40min, and react for 6h after the dropwise addition;

[0047] (d) Suction filtration after the reaction stopped, the filter cake was washed with hydrochloric acid, deionized water and absolute ethanol respectively, and then vacuum-dried at 60° C. / 0.01 MPa for 24 hours to obtain HCl-doped polyaniline nanotubes.

[0048] see figure 1 , at 25°C, when the ratio of aniline, ammonium persulfate, and hydrochloric aci...

Embodiment 3

[0085] (1) Material preparation

[0086] (1) The specific method for preparing polyaniline nanotubes is:

[0087] Include the following steps in turn:

[0088] (a) purifying aniline through secondary distillation in the presence of zinc powder;

[0089] (b) 2mol / l freshly distilled aniline is dissolved in 1mol / L hydrochloric acid;

[0090] (c) Slowly add 3mol / l (NH4)2S2O8 solution dropwise therein under stirring state, the dropwise addition time is about 30min, and react for 6h after the dropwise addition;

[0091] (d) Suction filtration after the reaction stopped, the filter cake was washed with hydrochloric acid, deionized water and absolute ethanol respectively, and then vacuum-dried at 60° C. / 0.01 MPa for 24 hours to obtain HCl-doped polyaniline nanotubes.

[0092] (2) Preparation of ZnO nanowires without any catalyst

[0093] Using Zn powder as raw material, ZnO nanowires were prepared by using a horizontal high-temperature tube furnace through physical thermal evapor...

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Abstract

The invention relates to the technical field of gas-sensitive materials, in particular to a composite resistance NH3 gas-sensitive gas sensor and a preparation method thereof. In the technical scheme, the preparation method for the composite resistance NH3 gas-sensitive gas sensor is characterized by comprising the following steps of: preparing materials, namely preparing large-scale ZnO nanowires without any catalysts by a physical thermal evaporation method, and preparing HCl-doped polyaniline nanotubes by a chemical oxidation method; weighing 10 mass parts of HCl-doped polyaniline nanotubes and 1 to 5 mass parts of ZnO nanowires, grinding powder of polyaniline and zinc oxide in a mortar for half an hour, adding N-methyl pyrrolidone for wet grinding for half an hour, and blending to obtain slurry; coating the slurry on a ceramic tube of which both ends are coated with a gold electrode and a platinum heating wire to obtain a thick film; and drying the thick film in the air for half an hour, and performing heat treatment in a vacuum drying oven at the temperature of 60 DEG C to obtain the gas-sensitive gas sensor.

Description

technical field [0001] The invention relates to the technical field of gas sensitive materials, in particular to a composite resistive NH 3 A gas sensitive gas sensor and a preparation method thereof. Background technique [0002] The research on polymer gas sensors has been greatly developed in recent years. Compared with inorganic semiconductor materials, polymer gas-sensing materials have many advantages. It is cheap and easy to obtain, easy to prepare, and can be deposited on various substrates, and the polymer material is easy to modify, and molecular design and synthesis can be carried out according to the functional requirements. By selecting different macromolecular chain structures and modifying them, Obtain different physical and chemical sensing properties, improve its sensitivity and selectivity to gas response, and most importantly, it can be used at room temperature or low temperature, which fundamentally solves the problem of existing inorganic semiconductor ...

Claims

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Application Information

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IPC IPC(8): G01N27/04
Inventor 于灵敏范新会祁立军李娇严文
Owner XIAN TECHNOLOGICAL UNIV
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