Zinc oxide-based sensing gas-sensitive composite material as well as preparation method and application thereof

A composite material, zinc oxide-based technology, applied in the direction of material resistance, material analysis, material analysis by electromagnetic means, etc., can solve the problems of easy carbon deposition and deactivation of catalysts, high risk of use, poor selectivity, etc.

Active Publication Date: 2021-09-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems with this type of sensor: 1. The working temperature is high (650-800°C), and it is more dangerous to use in an inflammable and explosive atmosphere
2. The stability is poor, the catalyst is prone to carbon deposition and deactivation, and needs to be re-calibrated within 7-14 days
3. Poor selectivity, responsive to other reducing gases (such as carbon monoxide, hydrogen sulfide, sulfur dioxide, etc.)
[0006] However, most of the reported work on methane sensing with zinc oxide-based materials focuses on the detection of a single methane system, and seldom involves the selective detection of methane under the coexistence of multi-component gases.

Method used

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Examples

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Effect test

preparation example Construction

[0030] In an optional embodiment, the preparation method of a zinc oxide-based sensing gas-sensing composite material provided by the present invention may include: using a solution reduction method to load nano-copper / silver particles on the surface of zinc oxide nano-agglomerates, Zinc oxide nano-agglomerates loaded with nano-copper / silver particles are obtained; the soluble palladium salt and the zinc oxide nano-agglomerates loaded with nano-copper / silver particles are prepared by using the nano-copper / silver reduction effect to prepare simultaneously loaded palladium and nano-copper Zinc oxide composite material of silver / silver; the in-situ growth method is used to coat the zinc ZIF layer on the surface of the zinc oxide composite material loaded with palladium and nanometer copper / silver at the same time, and prepare zinc oxide coated with zinc ZIF layer Based sensing gas-sensing composite materials.

[0031]After testing, the zinc oxide-based sensing gas-sensing composi...

Embodiment 1

[0062] Embodiment 1 (zinc-containing ZIF layer and microporous molecular sieve layer)

[0063](1) Under the conditions of 25°C and stirring (50 rev / min), add zinc oxide nanoparticles with agglomeration diameter of 100 nanometers (primary particle diameter of 1 nanometer) and copper nitrate containing sodium dodecylbenzenesulfonate The ethanol solution, the mass ratio of zinc oxide nanoparticles, copper nitrate, sodium dodecylbenzene sulfonate, and ethanol is controlled to be 1:0.1:0.5:50, and the constant temperature reaction is carried out for 1 hour to obtain 0.1% copper nanoparticles (particles) Zinc oxide nano-agglomerates with a diameter of 0.5 nm.

[0064] (2) At 25°C, stirring (50 rev / min), the above zinc oxide nano-agglomerates and palladium nitrate loaded with copper nanoparticles are added to the aqueous solution containing sodium dodecylsulfonate to control the zinc oxide nano-agglomerates , palladium nitrate, sodium dodecyl sulfonate, water mass ratio is 1:0.001:0...

Embodiment 2

[0070] Embodiment 2 (zinc-containing ZIF layer and microporous molecular sieve layer)

[0071] (1) Under the conditions of 120°C and stirring (50 rev / min), add zinc oxide nanoparticle aggregates (primary particle diameter 100 nanometers) and copper chloride containing hexadecyl trimethyl Ethylene glycol solution of ammonium bromide, control the aggregation of zinc oxide nanoparticles, copper chloride, cetyltrimethylammonium bromide, and ethylene glycol at a mass ratio of 1:1:5:500, and react at constant temperature for 10 hours , to obtain zinc oxide nano-agglomerates loaded with 5% copper nanoparticles (particle diameter: 20 nm).

[0072] (2) Under the conditions of 100° C. and stirring (500 rpm), add the above-mentioned zinc oxide nano-agglomerates and palladium chloride loaded with copper nanoparticles to the aqueous solution containing oleylamine to control zinc oxide, palladium chloride, oleylamine, The mass ratio of water is 1:0.02:5:500, constant temperature reaction f...

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Abstract

The invention discloses a zinc oxide-based sensing gas-sensitive composite material as well as a preparation method and application thereof. The preparation method comprises the following steps of: loading nano-copper / silver particles on the surface of a zinc oxide nano-agglomerate by a solution reduction method, and preparing a zinc oxide composite material simultaneously loaded with palladium and nano-copper / silver by utilizing a nano-copper / silver reduction effect; and coating the surface of the zinc oxide composite material with a zinc-containing ZIF layer through in-situ growth, and / or coating the surface of the composite material with a microporous molecular sieve layer through a coating method, so as to form the zinc oxide-based sensing gas-sensitive composite material. According to the invention, high-sensitivity, fast-response and high-selectivity sensing detection on methane can be realized, and a new way is provided for methane sensing in industries such as coal mines and natural gas.

Description

technical field [0001] The invention relates to the technical field of new chemical materials, in particular to a zinc oxide-based sensing gas-sensing composite material and a preparation method and application thereof. Background technique [0002] Methane (CH 4 ) is the main component of natural gas and coal mine gas. It is also a flammable and explosive gas, and the explosion limit in air is 5-15%. Rapid and accurate monitoring of methane concentration is the key to ensuring the safe production of natural gas and coal mines. There are three main types of methane sensors: catalytic combustion, infrared and semiconductor oxides. [0003] The catalytic combustion methane sensor mainly uses a catalytic combustion gas sensor for detection. The working principle is that methane burns flamelessly on the surface of a platinum catalyst, and the temperature rise causes a change in the resistance of the platinum wire. However, there are problems with this type of sensor: 1. The w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127G01N27/126Y02A50/20
Inventor 向兰罗仕睿吕昕峰杨帆张灵军黄著
Owner TSINGHUA UNIV
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