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Sensitive material for detecting methyl alcohol gas

A sensitive material and gas sensor technology, applied in the field of sensing, can solve the problem of low sensitivity, achieve high sensitivity and selectivity, and simple steps

Inactive Publication Date: 2016-08-03
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And X.H.Liu et al modified porous ZnO gas-sensing materials by Au nanoparticles J. Mater. Chem. 21(2011)349-356.), the sensitivity of this material to methanol at a concentration of 50ppm is less than 7
The present invention relates to a kind of by SnO 2 , SiO 2 , PdCl 2 , Sb 2 o 3 , Pt, V 2 o 5 and In 2 o 3 The sensitive material composed of nano-powder is used to detect methanol gas. It has the advantages of high sensitivity, fast response, outstanding selectivity, good stability and low working temperature. There are no relevant literature reports and patent applications.

Method used

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  • Sensitive material for detecting methyl alcohol gas
  • Sensitive material for detecting methyl alcohol gas
  • Sensitive material for detecting methyl alcohol gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) SnO 2 Preparation of Nanospheres

[0024] ① 4 mmol of tin chloride pentahydrate (SnCl 4 ·5H 2 O) Dissolve in 40mL of N,N - in a mixed solution of dimethylformamide (DMF) and deionized water, where N,N -The volume ratio of dimethylformamide (DMF) and deionized water is 1:2, then add 20mL (2mol / L) sodium hydroxide (NaOH) solution dropwise to it, and stir magnetically at room temperature to mix the solution evenly;

[0025] ②Transfer the above solution into a 90mL high-pressure hydrothermal kettle lined with polytetrafluoroethylene, seal it; keep it warm at 180°C for 24 hours, cool to room temperature, and wash the resulting precipitate with deionized water and absolute ethanol several times Centrifugal cleaning, and then drying in a constant temperature drying oven at 80 ° C for 24 hours to obtain SnO 2 nanospheres.

[0026] (2) Preparation of a sensitive material for detecting methanol gas

[0027] The SnO prepared in step (1) 2 nanospheres, and SiO 2 , PdCl...

Embodiment 2

[0032] (1) SnO 2 Preparation of Nanospheres

[0033] ① 4 mmol of tin chloride pentahydrate (SnCl 4 ·5H 2 O) Dissolve in 40mL of N,N - in a mixed solution of dimethylformamide (DMF) and deionized water, where N,N -The volume ratio of dimethylformamide (DMF) and deionized water is 1:2, then add 20mL (2mol / L) sodium hydroxide (NaOH) solution dropwise to it, and stir magnetically at room temperature to mix the solution evenly;

[0034] ②Transfer the above solution into a 90mL high-pressure hydrothermal kettle lined with polytetrafluoroethylene, seal it; keep it warm at 180°C for 24 hours, cool to room temperature, and wash the resulting precipitate with deionized water and absolute ethanol several times Centrifugal cleaning, and then drying in a constant temperature drying oven at 80 ° C for 24 hours to obtain SnO 2 nanospheres.

[0035] (2) Preparation of a sensitive material for detecting methanol gas

[0036] The SnO prepared in step (1) 2 nanospheres, and SiO 2 , Pd...

Embodiment 3

[0041] (1) SnO 2 Preparation of Nanospheres

[0042] ① 4 mmol of tin chloride pentahydrate (SnCl 4 ·5H 2 O) Dissolve in 40mL of N,N - in a mixed solution of dimethylformamide (DMF) and deionized water, where N,N -The volume ratio of dimethylformamide (DMF) and deionized water is 1:2, then add 20mL (2mol / L) sodium hydroxide (NaOH) solution dropwise to it, and stir magnetically at room temperature to mix the solution evenly;

[0043] ②Transfer the above solution into a 90mL high-pressure hydrothermal kettle lined with polytetrafluoroethylene, seal it; keep it warm at 180°C for 24 hours, cool to room temperature, and wash the resulting precipitate with deionized water and absolute ethanol several times Centrifugal cleaning, and then drying in a constant temperature drying oven at 80 ° C for 24 hours to obtain SnO 2 nanospheres.

[0044] (2) Preparation of a sensitive material for detecting methanol gas

[0045] The SnO prepared in step (1) 2 nanospheres, and SiO 2 , Pd...

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Abstract

The invention relates to a sensitive material for detecting methyl alcohol gas and belongs to the technical field of gas sensors.The sensitive material is characterized by being compound powder, which is composed of 90-100% of SnO2, 1-3% of SiO2, 0.2-2% of PdC12, 0.2-2% of Sb2O3, 1-3% of Pt, 0.4-1.0% of V2O5 and 20-40% of In2O3.A preparation method of the sensitive material comprises the steps of synthesizing SnO2 nano microspheres through a one-step hydrothermal method, and then conducting solid phase synthesis on nano powder of SiO2, PdC12, Sb2O3, Pt, V2O5 and In2O3 and the prepared SnO2 nano microspheres.A methyl alcohol gas sensor made of the sensitive material has the advantages of being high in sensitivity, high in response speed, prominent in selectivity, good in stability, low in working temperature and the like, microscale methyl alcohol can be detected on line rapidly and accurately without being disturbed by common coexisting substances, and the sensitive material is a promising sensitive material for detecting the methyl alcohol gas.

Description

technical field [0001] The invention relates to the field of sensing technology, in particular to a sensitive material for detecting methanol gas, especially a material made of SnO 2 , SiO 2 , PdCl 2 , Sb 2 o 3 , Pt, V 2 o 5 and In 2 o 3 Sensitive material composed of nano powder. Background technique [0002] Methanol, also known as wood alcohol or wood essence, is an important organic chemical raw material and high-quality fuel. With the rapid development of modern social chemical industry, methanol has been widely used in fine chemicals, plastics and other fields. But at the same time, methanol is also a volatile, flammable, explosive, and toxic organic liquid. Its ignition point is 463.85°C. When its vapor mixes with air, it can form an explosive mixture. The explosion limit is 6.0% to 36.5%. Once methanol is leaked , will lead to a series of security incidents. At the same time, methanol has a greater impact on the nervous system and blood system of the human ...

Claims

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Application Information

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IPC IPC(8): G01N27/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00G01N27/00
Inventor 王毓德李郁秀肖雪春
Owner YUNNAN UNIV
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