Tin oxide alumina-based low-concentration acetone gas sensor and preparation method thereof

A gas sensor, alumina-based technology, used in instruments, scientific instruments, measuring devices, etc., can solve the problems of low detection limit of acetone, limited practical application of acetone sensor, short response time, etc., and achieves pollution-free carry and low cost. , The effect of fast response and recovery time

Inactive Publication Date: 2015-08-05
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, metal oxide semiconductor sensors are used to detect gases due to their small size, convenient use, and high sensitivity. However, the detection limit of existing sensors for acetone is not low and the response time is not short, which limits the practical application of acetone sensors.

Method used

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  • Tin oxide alumina-based low-concentration acetone gas sensor and preparation method thereof
  • Tin oxide alumina-based low-concentration acetone gas sensor and preparation method thereof
  • Tin oxide alumina-based low-concentration acetone gas sensor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) Nanoporous SnO doped with Pt in the inner layer 2 Preparation of base material: weigh 3 g SnCl 4 ·5H 2 O was dissolved in 15 ml deionized water and 15 ml absolute ethanol, and then 6 g CO(NH 2 ) 2 And 1 g (NH 4 ) 2 SO 4 After 3 hours of magnetic stirring, a uniform and clear precursor solution is obtained; the reaction solution is transferred to the inner lining of a 50 ml hydrothermal reaction vessel, the reaction vessel is screwed and sealed, and reacted in an oven at 100 ℃ for 24 hours; cooled to room temperature and centrifuged , Wash the precipitate with deionized water and absolute ethanol several times, and place it in an oven at 60 ℃ to dry overnight to obtain a solid precursor; place the precursor in a muffle furnace at 550 ℃ for 5 hours and grind with an agate mortar to obtain nano Porous SnO 2 material. Take H with a mass percentage of 1.0 wt% 2 PtCl 6 The solution is added dropwise to the prepared nanoporous SnO 2 The material is mixed uniformly, dried, a...

Embodiment 2

[0026] (1) Nanoporous SnO doped with Pt in the inner layer 2 Preparation of base material: weigh 3 g SnCl 4 ·5H 2 O was dissolved in 15 ml deionized water and 15 ml absolute ethanol, and then 5 g CO(NH 2 ) 2 And 2 g (NH 4 ) 2 SO 4 After 3 hours of magnetic stirring, a uniform and clear precursor solution is obtained; the reaction solution is transferred to the inner lining of a 50 ml hydrothermal reaction vessel, the reaction vessel is screwed and sealed, and reacted in an oven at 110 ℃ for 20 hours; cooled to room temperature and centrifuged , Wash the precipitate with deionized water and absolute ethanol several times, and place it in an oven at 60 ℃ to dry overnight to obtain a solid precursor; place the precursor in a muffle furnace at 550 ℃ for 5 hours and grind with an agate mortar to obtain nano Porous SnO 2 material. Take 0.5 wt% of H 2 PtCl 6 The solution is added dropwise to the prepared nanoporous SnO 2 The material is mixed uniformly, dried, and fired at 500°C for 1 ...

Embodiment 3

[0030] (1) Nanoporous SnO doped with Pt in the inner layer 2 Preparation of base material: weigh 3 g SnCl 4 ·5H 2 O was dissolved in 15 ml deionized water and 15 ml absolute ethanol, and then 4 g CO(NH 2 ) 2 And 3 g (NH 4 ) 2 SO 4 After 3 hours of magnetic stirring, a uniform and clear precursor solution is obtained; the reaction solution is transferred to the inner lining of a 50 ml hydrothermal reaction vessel, the reaction vessel is screwed and sealed, and reacted in an oven at 105 ℃ for 22 hours; cooled to room temperature and centrifuged , Wash the precipitate with deionized water and absolute ethanol several times, and place it in an oven at 60 ℃ to dry overnight to obtain a solid precursor; place the precursor in a muffle furnace at 550 ℃ for 5 hours and grind with an agate mortar to obtain nano Porous SnO 2 material. Take H with a mass percentage of 0.1 wt% 2 PtCl 6 The solution is added dropwise to the prepared nanoporous SnO 2 The material is mixed uniformly, dried, a...

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Abstract

The invention relates to a preparation method of a low-concentration acetone gas sensor, and belongs to the technical field of preparation processes of metal oxide semiconductor gas sensors. The gas sensor is mainly characterized in that double layers of nanometer sensitive materials with porous structures are coated on the surface of an aluminum oxide ceramic pipe, an inner substrate material is Pt doped nanometer porous SnO2, and an outer sensitizing material is nanometer porous Al2O3. After a gas-sensitive element coating the Pt doped porous SnO2 substrate material is roasted for 2 hours at the temperature of 500 DEG C, the porous Al2O3 sensitizing material is uniformly coated on the outer surface of the gas-sensitive element, and the gas-sensitive element is welded according to a thick-film semiconductor gas-sensitive element manufacturing process after dried at the indoor temperature (comprises a platinum wire and a nickel-cadmium heating wire in a cavity of a ceramic pipe), aged and packaged to make the low-concentration acetone gas sensor. The made sensor has the advantages of low detection limit, fast response and recovery, fine stability and the like for acetone gas.

Description

technical field [0001] The invention relates to a method for preparing a low-concentration acetone gas sensor, and belongs to the technical field of metal oxide semiconductor gas sensor preparation technology. Background technique [0002] With the rapid development of modern society, people's living standards have been continuously improved. However, while the development of science and technology brings benefits, people are exposed to more and more volatile organic compounds in daily life, which seriously endangers public health. Among them, acetone, as a common organic solvent, is widely used in coatings, pesticides, industrial production and other fields. Because acetone is volatile, flammable, explosive and toxic, once it leaks, it is easy to cause safety accidents. At the same time, acetone vapor will inhibit the central nervous system and affect human health. Therefore, effective monitoring of acetone can improve the accuracy of predicting accidents, eliminate hidden...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
Inventor 何丹农陈俊琛金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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