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Preparation method of novel high-selectivity acetone gas sensitive sensor

A high-selectivity, acetone gas-sensing technology, applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problems of long response-recovery time, poor product consistency, poor selectivity, etc., to achieve improved sensitivity, low cost, and high selectivity sexual effect

Inactive Publication Date: 2018-03-20
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the domestically developed acetone sensors have poor selectivity, poor product consistency, low sensitivity, and long response-recovery time, and the special sensor for acetone gas has not yet formed an effective industrialization

Method used

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  • Preparation method of novel high-selectivity acetone gas sensitive sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of colloids

[0027] (1) configure the solvent for preparing the colloid. Mix absolute ethanol and deionized water at a volume ratio of 1:1, and stir until uniform.

[0028] (2) Use an electronic balance to weigh Zn(CH 3 COO) 2 2H 2 O crystals and NaOH crystals were mixed with the prepared solvents to prepare solutions with concentrations of 0.8 mol / L and 1.6 mol / L, respectively.

[0029] (3) Weigh w(Al 2 o 3 ) is 4.5wt% Al(NO 3 ) 3 9H 2 O mixed into Zn(CH 3 COO) 2 in solution;

[0030] (4) Cetyltrimethylammonium bromide and Zn(CH 3 COO) 2 The solutions are mixed in a ratio of 1:5;

[0031] (5) Stir the Zn(CH 3 COO) 2 solution, the rotation speed is about 100r / min, NaOH solution is dripped into Zn(CH 3 COO) 2 solution, stop when the solution is detected with pH test paper until pH=7;

[0032] (6) Continue stirring for 0.5 hour after the colloid is formed, turn off the stirrer, and leave the colloid to obtain the colloid after 24 hours. ...

Embodiment 2

[0050] 1. Preparation of colloids

[0051] (1) configure the solvent for preparing the colloid. Mix absolute ethanol and deionized water at a volume ratio of 1:2, and stir until uniform.

[0052] (2) Use an electronic balance to weigh Zn(CH 3 COO) 2 2H 2 O crystals and NaOH crystals were mixed with the prepared solvents to prepare solutions with concentrations of 1mol / L and 2mol / L, respectively.

[0053] (3) Weigh w(Al 2 o 3 ) is 4wt% Al(NO 3 ) 3 9H 2 O mixed into Zn(CH 3 COO) 2 in solution;

[0054] (4) Cetyltrimethylammonium bromide and Zn(CH 3 COO) 2 The solutions are mixed in a ratio of 1:4;

[0055] (5) Stir the Zn(CH 3 COO) 2 solution, the rotating speed is about 80r / min, NaOH solution is dripped into Zn(CH 3 COO) 2 solution, stop when the solution is detected with pH test paper until pH=7;

[0056] (6) Continue to stir for 1 hour after the colloid is formed, turn off the stirrer, and leave the colloid to obtain the colloid after 24 hours.

[0057] 4....

Embodiment 3

[0074] 1. Preparation of colloids

[0075] (1) configure the solvent for preparing the colloid. Mix absolute ethanol and deionized water at a volume ratio of 1:1, and stir until uniform.

[0076] (2) Use an electronic balance to weigh Zn(CH 3 COO) 2 2H 2 O crystals and NaOH crystals were mixed with the prepared solvents to prepare solutions with concentrations of 0.8 mol / L and 1.6 mol / L, respectively.

[0077] (3) Weigh w(Al 2 o 3 ) is 5wt% Al(NO 3 ) 3 9H 2 O mixed into Zn(CH 3 COO) 2 in solution;

[0078] (4) Cetyltrimethylammonium bromide and Zn(CH 3 COO) 2 The solutions are mixed in a ratio of 1:5;

[0079] (5) Stir the Zn(CH 3 COO) 2 Solution, rotating speed is about 150r / min, drop NaOH solution into Zn(CH 3 COO) 2 solution, stop when the solution is detected with pH test paper until pH=7;

[0080] (6) Continue stirring for 0.5 hour after the colloid is formed, turn off the stirrer, and leave the colloid to obtain the colloid after 24 hours.

[0081] 6....

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Abstract

The invention relates to a preparation method of a novel high-selectivity acetone gas sensitive sensor and is suitable for the field of preparing a gas sensing apparatus with a high selective characteristic on acetone steam. The preparation method comprises the following steps: by adopting a sol-gel method, adding hexadecyl trimethyl ammonium bromide in a process of preparing Zn(OH)2 colloid; thendrying and grinding the colloid, cleaning the colloid and carrying out annealing at high temperature; coating a ceramic tube with the prepared material through hexadecyl trimethyl ammonium bromide; and preparing a gas sensitive sensor after low-temperature annealing; and then carrying out aging. In the colloid preparation process, hexadecyl trimethyl ammonium bromide is added to generate a stablecolloid favorably; the ceramic tube is coated with the mateiral by using hexadecyl trimethyl ammonium bromide which plays a binding role; moreover, through low-temperature annealing, the selectivityof the gas sensitive element can be improved by means of hexadecyl trimethyl ammonium bromide. The gas sensitive element prepared by the method has a sensitive characteristic on acetone steam, and candetect the acetone steam from much organic steam.

Description

Technical field: [0001] The invention belongs to a method for preparing a gas sensing device with high selectivity for acetone vapor. technical background: [0002] With the gradual strengthening of social environmental awareness, gas sensors have been widely used in domestic petroleum, chemical, metallurgy, pharmaceutical, food, medical, road transportation, municipal gas, digital mines and other industries. Oxide semiconductor gas sensors are widely used in the detection of various target gases due to their high sensitivity, fast response, small size, low energy consumption and cost, and simple operation. The preparation process of the material has a great influence on the gas-sensing performance, and the corresponding forms include sintered type, thick film type and thin film type. Nanomaterials currently prepared in the laboratory include nanoparticles, nanowires, nanobelts, nanorings, nanotubes, nanochannels, and holes. Acetone is an organic solvent widely used in ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 潘国峰李菲陈静李洋洋
Owner HEBEI UNIV OF TECH
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