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Surface silver-particle-modified layered double hydroxide gas-sensitive element and preparation method and application thereof

A layered bimetallic and hydroxide technology, applied in nickel oxide/nickel hydroxide, zinc oxide/zinc hydroxide, aluminum oxide/aluminum hydroxide, etc. permission and other issues

Active Publication Date: 2019-11-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In reality, the high temperature condition is a big obstacle. It not only consumes energy but also requires complex structural design in the process of sensor preparation, which greatly hinders the development of integrated circuit miniaturization and greatly increases the cost; in addition , high temperature operation is not allowed in many situations, especially in some flammable and explosive environments

Method used

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  • Surface silver-particle-modified layered double hydroxide gas-sensitive element and preparation method and application thereof
  • Surface silver-particle-modified layered double hydroxide gas-sensitive element and preparation method and application thereof
  • Surface silver-particle-modified layered double hydroxide gas-sensitive element and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Configure the precursor solution required for hydrothermal reaction

[0027] Add sodium lauryl sulfate powder into 50ml deionized water, stir magnetically for 10min to dissolve it completely, and obtain a 0.45mmol / L sodium lauryl sulfate solution. Mix magnesium nitrate and aluminum nitrate powder according to the ratio of 2:1 Add the molar ratio of magnesium to aluminum into the sodium lauryl sulfate solution, keep stirring, weigh 6mmol of urea and dissolve it in 10ml of deionized water, add the obtained urea solution to the above solution drop by drop, and then continue magnetic stirring for 20min .

[0028] (2) Preparation of magnesium-aluminum layered double metal hydroxide by hydrothermal method

[0029] The final solution after (1) stirring is transferred to a 100ml high-pressure reactor lined with polytetrafluoroethylene, and after sealing, the reactor is placed in an oven for hydrothermal reaction. The oven operating temperature is 150 ° C, and the heating t...

Embodiment 2

[0040] (1) Configure the precursor solution required for hydrothermal reaction

[0041] Add sodium lauryl sulfate powder into 50ml of deionized water, stir magnetically for 10 minutes, and dissolve it completely to obtain a 0.9mmol / L sodium lauryl sulfate solution. Mix zinc nitrate and aluminum nitrate powder in a ratio of 3:1 Add the molar ratio of zinc to aluminum into the sodium lauryl sulfate solution, keep stirring, weigh 6mmol of urea and dissolve it in 10ml of deionized water, add the obtained urea solution to the above solution drop by drop, and then continue magnetic stirring for 20min .

[0042] (2) Preparation of zinc-aluminum layered double metal hydroxides by hydrothermal method

[0043] The final solution after (1) stirring is transferred to a 100ml high-pressure reactor lined with polytetrafluoroethylene, and after sealing, the reactor is placed in an oven for hydrothermal reaction. The oven operating temperature is 150 ° C, and the heating time is 2h.

[004...

Embodiment 3

[0054] (1) Configure the precursor solution required for hydrothermal reaction

[0055] Add sodium lauryl sulfate powder into 50ml of deionized water, stir magnetically for 10min, and dissolve it completely to obtain a 1.8mmol / L sodium lauryl sulfate solution. Mix nickel nitrate and aluminum nitrate powder according to the ratio of 3:1 Add the molar ratio of nickel to aluminum into the sodium lauryl sulfate solution, keep stirring, weigh 6mmol of urea and dissolve it in 10ml of deionized water, add the obtained urea solution to the above solution drop by drop, and then continue magnetic stirring for 20min .

[0056] (2) Preparation of nickel-aluminum layered double hydroxides by hydrothermal method

[0057] The final solution after (1) stirring is transferred to a 100ml high-pressure reactor lined with polytetrafluoroethylene. After sealing, the reactor is placed in an oven for hydrothermal reaction. The operating temperature of the oven is 180 ° C, and the heating time is 1...

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Abstract

The invention discloses a surface silver-particle-modified layered double hydroxide gas-sensitive element and a preparation method and application thereof. A flower-shaped layered graded nano-composite structure of the nano-silver / layered double hydroxide is prepared by adopting a precious-metal surface modification method. The ethanol sensitive performance of a composite structure system is further improved and promoted through chemical sensitization of the nano-silver by utilizing the huge gas adsorption specific area provided by the flower-shaped layered grading structure of the LDHs. In the three-dimensional grading composite nano-structure prepared through the invention, the layered double hydroxide and the precious metal silver have the collaborative coupling effect, and the formed gas-sensitive element has high sensitivity and good response recovery characteristic on the ethanol under the room temperature, so that the gas-sensitive element is a room temperature ethanol sensitiveelement with great potential.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and more specifically relates to a preparation method of a layered double metal hydroxide high-performance gas sensor modified by surface silver particles for detecting ethanol at room temperature; high sensitivity to ethanol can be realized at room temperature detection, and has extremely fast response recovery characteristics, and also exhibits good selectivity. Background technique [0002] Every year, traffic accidents caused by drunk driving have brought serious personal and property safety to people. Therefore, in order to reduce drunk driving incidents, the traffic management department has formulated a strict drunk driving management system, and a series of electrochemical sensors for quickly detecting the alcohol concentration in the exhaled breath of the human body have also emerged as the times require. Among them, semiconductor metal oxide gas sensors have been widely prepared an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/407C01F7/02C01G9/02C01G53/04
CPCG01N27/4071C01F7/02C01G9/02C01G53/04
Inventor 秦玉香王立萍王霄飞白忆楠
Owner TIANJIN UNIV
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