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to no x ppy/sno with high selectivity 2 Nanotube Composite Gas Sensing Materials

A nanotube composite and gas-sensing material technology, applied in the field of gas-sensing materials, can solve the problems of poor selectivity and low sensitivity, and achieve the effect of improving selectivity

Active Publication Date: 2020-08-25
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a method for NO X PPy / SnO with high selectivity 2 The nanotube composite gas-sensing material solves the problem of NO in the low-temperature working range of the gas-sensing material in the prior art. X The problem of poor selectivity and low sensitivity

Method used

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  • to no <sub>x</sub> ppy/sno with high selectivity <sub>2</sub> Nanotube Composite Gas Sensing Materials
  • to no <sub>x</sub> ppy/sno with high selectivity <sub>2</sub> Nanotube Composite Gas Sensing Materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: the PVP (polyvinylpyrrolidone) of 1g is joined in the dehydrated alcohol of 10ml and stirs 2h to obtain solution A, and the stannous chloride (SnCl2) of 0.8g 2 • 2H 2 O) Added to 4ml of DMF (N,N-dimethylformamide) and stirred for 2h to obtain solution B, then poured solution A into solution B and stirred for 2h to obtain a transparent precursor solution.

[0028] Electrospinning technology was used for spinning, the DC spinning voltage was set to 12kV, and the solidification distance between the nozzle and the receiver was 15cm to obtain PVP composite nanofibers containing precursors. Put the PVP composite nanofibers into an annealing furnace, and perform calcination treatment in an air atmosphere. The temperature is raised from room temperature to 600°C, the heating rate is 10°C / min, and the calcination time is 3h. After that, it is naturally cooled to room temperature with the furnace body to obtain SnO 2 nanotube fibers.

[0029] Mix 20mg of sodium la...

Embodiment 2

[0032] Example 2: 0.8g of PVP was added to 9ml of absolute ethanol and stirred for 2h to obtain solution A, and 1.2 g of SnCl 2 • 2H 2 O was added to 5ml of DMF and stirred for 2.5h to obtain solution B, then solution A was poured into solution B, and stirred for 2h to obtain a transparent precursor solution.

[0033] Electrospinning technology was used for spinning, the DC spinning voltage was set to 10kV, and the solidification distance between the nozzle and the receiver was 15cm to obtain PVP composite nanofibers containing precursors. Put the PVP composite nanofibers into an annealing furnace, and perform calcination treatment in an air atmosphere. The temperature is raised from room temperature to 600°C, the heating rate is 15°C / min, and the calcination time is 3h. After that, it is naturally cooled to room temperature with the furnace body to obtain SnO 2 nanotube fibers.

[0034] Mix 10mg of sodium lauryl sulfate with 0.05g of SnO 2 Hollow nanofibers were added to 5...

Embodiment 3

[0036] Embodiment 3: the PVP of 0.7g is joined in the dehydrated alcohol of 8ml and stirs 2h to obtain solution A, and the tin protochloride (SnCl 2 • 2H 2 O) Added to 3ml of DMF and stirred for 2h to obtain solution B, then poured solution A into solution B and stirred for 2h to obtain a transparent precursor solution.

[0037] Electrospinning technology was used for spinning, the DC spinning voltage was set to 5kV, and the solidification distance between the nozzle and the receiver was 13cm, and PVP composite nanofibers containing precursors were obtained. Put the PVP composite nanofibers into the annealing furnace, and carry out calcination treatment in the air atmosphere, raise the temperature from room temperature to 550°C, the heating rate is 10°C / min, and the calcination time is 2.5h, and then naturally cool to room temperature with the furnace body to obtain SnO 2 nanotube fibers.

[0038] Mix 10mg of sodium dodecylbenzenesulfonate with 0.03g of SnO 2 Hollow nanofi...

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Abstract

The invention provides a PPy / SnO2 nanotube composite gas-sensitive material with high selectivity to NOx to overcome the problems of poor NOx selectivity and low sensitivity of conventional gas-sensing materials in a low-temperature working range. The PPy / SnO2 nanotube composite gas-sensitive material is prepared through the following steps: (1) preparation of a precursor solution of SnO2 nanofibers; (2) preparation of PVP composite nanofibers through electrospinning; (3) preparation of SnO2 nanotube fibers through calcining; (4) and preparation of the PPy / SnO2 nanotube composite material. ThePPy / SnO2 nanotube composite gas-sensitive material prepared in the invention is improved by three times in sensitivity to NOx compared with common SnO2 while not increased, or even obviously reducedin sensitivity to H2S, NH3, acetone and anhydrous ethanol; and the material is improved in selectivity to NOx and is applicable as a gas sensitive element for NOx.

Description

technical field [0001] The invention relates to a gas sensitive material, in particular to a x Selective gas sensitive material. Background technique [0002] With the rapid development of industrialization, NO, NO 2 Nitrogen oxides (NO X ) pollution problem is becoming increasingly prominent, NO X are toxic, and acid rain, eutrophication, and the hole in the stratospheric ozone layer are also related to NO x gas related. At the same time, the ability of NO to bind hemoglobin is stronger than that of carbon monoxide, which is more likely to cause hypoxia in the human body. NO is easily oxidized into NO in the air. 2 , while NO 2 It has a strong stimulating effect on the respiratory tract, and can cause lung damage or even pulmonary edema in severe cases. Therefore, NO X The real-time monitoring of gas is urgent. [0003] Currently measured NO x The methods mainly adopt ion chromatography, gas chromatography, etc. These methods require expensive instruments and equip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 王新昌陈卓杨辉冯菁贾建峰
Owner ZHENGZHOU UNIV