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Preparation method of nano ferric oxide (Fe2O3) for acetone gas sensor material

A nano-iron trioxide, gas sensor technology, applied in nanotechnology for materials and surface science, iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of incompatibility, high gas sensitivity and fast response, etc. Achieving the effect of high gas sensitivity

Inactive Publication Date: 2014-01-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to overcome existing Fe 2 o 3 The acetone sensor is difficult to be compatible with the problems of high gas sensitivity and fast response, and a nano-Fe prepared by a hard template method is provided. 2 o 3 Preparation method of acetone gas sensor as gas sensitive material

Method used

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  • Preparation method of nano ferric oxide (Fe2O3) for acetone gas sensor material
  • Preparation method of nano ferric oxide (Fe2O3) for acetone gas sensor material
  • Preparation method of nano ferric oxide (Fe2O3) for acetone gas sensor material

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1: Using ordered mesoporous silica MCM-41 as a hard template, add it to an ethanol solution of ferric nitrate (the solution concentration is not limited) and stir and impregnate, so that ferric nitrate is immersed in the mesoporous channels of silica, Then dry and evaporate the solvent, and calcine at 300°C in an atmosphere of sufficient air circulation to transform the iron precursor into Fe 2 o 3 , and then use 2M concentration of sodium hydroxide solution to stir and centrifuge to remove the silica template to obtain the desired nano-Fe 2 o 3 Gas-sensitive material (the masses of the hard template and the iron precursor are 4g and 0.2g respectively, and the mass ratio is 20).

[0019] Then prepare nano-Fe 2 o 3 Apply the slurry, and use a paint pen to evenly coat the slurry on the outer surface of the ceramic tube core with gold electrodes to form nano-Fe 2 o 3 The thickness of the sensing layer is 50um. After the coating is completed, it is dried under...

Embodiment 2

[0020] Example 2: Using ordered mesoporous silica KIT-6 as a hard template, add it to an aqueous solution of ferric chloride (the concentration of the solution is not limited) and stir and impregnate it, so that ferric chloride can be immersed in the mesoporous channels of silica , then dry and evaporate the solvent, and calcine at 500°C in an atmosphere of sufficient air circulation to transform the iron precursor into Fe 2 o 3 , and then use 2M concentration of sodium hydroxide solution to stir and centrifuge to remove the silica template to obtain the desired nano-Fe 2 o 3 Gas-sensitive material (the masses of the hard template and the iron precursor are 1 g and 2 g respectively, and the mass ratio is 0.5).

[0021] figure 2 For the prepared nano-Fe 2 o 3 TEM photographs of the prepared Fe 2 o 3 Has a rod-like nanostructure morphology; then formulate nano-Fe 2 o 3 Apply the slurry, and use a paint pen to evenly coat the slurry on the outer surface of the ceramic t...

Embodiment 3

[0022] Example 3: Using ordered mesoporous silica SBA-15 as a hard template, add it to an ethanol solution of ferric sulfate (the concentration of the solution is not limited) and stir and impregnate, so that ferric sulfate is immersed in the mesoporous channels of silica, Then dry and evaporate the solvent, and calcine at 800°C in an atmosphere of sufficient air circulation to transform the iron precursor into Fe 2 o 3 , and then use 2M concentration of sodium hydroxide solution to stir and centrifuge to remove the silica template to obtain the desired nano-Fe 2 o 3 Gas-sensitive material (the masses of the hard template and the iron precursor are 1 g and 5 g respectively, and the mass ratio is 0.2).

[0023] image 3 For the prepared nano-Fe 2 o 3 The XRD photo of the prepared Fe 2 o 3 Has an amorphous nanostructure; then formulates nano-Fe 2 o 3 Apply the slurry, and use a paint pen to evenly coat the slurry on the outer surface of the ceramic tube core with gold e...

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Abstract

The invention relates to a preparation method of nano ferric oxide (Fe2O3) for an acetone gas sensor material. A pre-synthesized ordered mesoporous silicon oxide material is used as a hard template, and a nano Fe2O3 material is prepared by the steps of iron precursor impregnation, drying, calcination crystal transformation, template removal and the like. The nano Fe2O3 prepared by the hard template process is used as a gas sensitive material to prepare slurry which is coated on a sensing layer at a thickness of 0.2-50 microns; through the preparation method of the nano-structure gas sensitive material, a gas sensitive layer with a large specific surface area is realized, and the gas sensitivity is relatively high. The preparation method of a gas sensor is simple to operate and easy to realize, and the gas-sensitive specific surface area is larger than 180m<2> / g; moreover, the acetone gas sensitivity of the prepared gas sensor is improved to 100ppm, and the best sensing property is greater than 10, which is higher than the property of an industrial commonly-used acetone sensor.

Description

technical field [0001] The invention belongs to the application field of nano inorganic materials. More specifically relate to a kind of nanometer ferric oxide (Fe 2 o 3 )Preparation. Background technique [0002] Semiconductor resistive gas sensors are widely used in domestic and industrial gas sensing fields due to their advantages of low price, good gas sensitivity, and easy assembly. In recent years, the use of gas sensors to detect the types of atmosphere in the exhaled air of the human body has attracted more and more attention to monitoring the health of the human body. Presence of acetone gas. The small and easy-to-carry acetone gas sensor is used to monitor the concentration of the patient's exhaled gas at any time so as to pay close attention to the development of the disease, which is conducive to timely control of the aggravation of the disease and reduces the treatment cost of the patient. However, the current industrialized acetone gas sensors have disadva...

Claims

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Application Information

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IPC IPC(8): C01G49/06B82Y30/00
Inventor 孙晓红郑春明
Owner TIANJIN UNIV
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