Method for preparing ethanol sensitive material with fine graded porous structure

An ethanol-sensitive, hierarchically porous technology, applied in the field of sensing materials, can solve problems such as loose connection, limited selective recognition stability, and cumbersome preparation process, so as to ensure safety and stability, ensure people's life safety, and simple process The effect of environmental protection

Inactive Publication Date: 2010-08-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its preparation process is cumbersome, and the resulting SnO 2 Scattered distribution of nanorods and loose connections limit their selective recognition and stability at low concentrations of ethanol gas

Method used

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  • Method for preparing ethanol sensitive material with fine graded porous structure
  • Method for preparing ethanol sensitive material with fine graded porous structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 2M HNO to tin metal powder 3 Stir in the solution until the solution turns light yellow, and filter to obtain the impregnation solution. Rinse the butterfly wings in absolute ethanol. Before the absolute alcohol is completely dried and volatilized, when the color of the butterfly wings changes from dark green to blue-purple, quickly place the treated butterfly wings on the tin Soak in the salt dipping solution for 24 hours, take out the butterfly wings, wash them with alcohol, put them in a drying oven at 60°C for drying, and then put them in an oxidation furnace for burning treatment, and raise the temperature to 550°C at a heating rate of 2°C / min. After 1.5 hours of heat preservation, it was naturally cooled to room temperature, and the white flake product obtained was rutile tin dioxide (JCPD41-1445) with finely graded porous structure in butterfly wing shape. Its grain size is about 7.0nm, and its specific surface area and porosity are 51m 2 g -1 and 0.14cm ...

Embodiment 2

[0018] Add 2M HNO to tin metal powder 3 Stir in the solution until the solution turns light yellow, and filter to obtain the impregnation solution. Rinse the butterfly wings in absolute ethanol. Before the absolute alcohol is completely dried and volatilized, when the color of the butterfly wings changes from dark green to blue-purple, quickly place the treated butterfly wings on the tin Soak in the salt dipping solution for 18 hours, take out the butterfly wings, wash them with alcohol, put them in a drying oven at 60°C for drying, and then put them in an oxidation furnace for burning treatment, and raise the temperature to 550°C at a heating rate of 2°C / min. After 1.5 hours of heat preservation, it was naturally cooled to room temperature, and the white flake product obtained was rutile tin dioxide (JCPD41-1445) with finely graded porous structure in butterfly wing shape. Its grain size is about 7.0nm, and its specific surface area and porosity are 50m 2 g -1 and 0.15cm ...

Embodiment 3

[0020] Add 2M HNO to tin metal powder 3 Stir in the solution until the solution turns light yellow, and filter to obtain the impregnation solution. Rinse the butterfly wings in absolute ethanol. Before the absolute alcohol is completely dried and volatilized, when the color of the butterfly wings changes from dark green to blue-purple, quickly place the treated butterfly wings on the tin Soak in the salt dipping solution for 14 hours, take out the butterfly wings, wash them with alcohol, put them in a drying oven at 60°C for drying, and then put them in an oxidation furnace for burning treatment, and raise the temperature to 550°C at a heating rate of 2°C / min. After 1.5 hours of heat preservation, it was naturally cooled to room temperature, and the white flake product obtained was rutile tin dioxide (JCPD41-1445) with finely graded porous structure in butterfly wing shape. Its grain size is about 7.0nm, and its specific surface area and porosity are 56m 2 g -1 and 0.16cm ...

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Abstract

The invention discloses a method for preparing an ethanol sensitive material with a fine graded porous structure in the technical field of sensitive materials. A natural butterfly wing adopted as a structural template is pretreated and then placed in tin salt impregnation liquid to perform impregnation, and then the natural butterfly wing is subjected to oxidation firing treatment to form a metal oxide material with a fine graded porous structure. The preparation method is simple and flexible and has low cost; and the prepared gas sensitive material with the fine graded porous structure is a good ethanol gas sensitive material, and can have high selection sensitivity on ethanol at a lower temperature.

Description

technical field [0001] The invention relates to a method in the technical field of sensing materials, in particular to a method for preparing an ethanol sensitive material with a finely graded porous structure. Background technique [0002] With the development of industry, once the widely used flammable and explosive gases leak during production, transportation and use, it will cause fire or even explosion accidents, seriously affecting people's life and property safety. And because such accidents have the characteristics of strong suddenness, difficulty in rescue, and wide range of hazards, it is particularly important to monitor the content of these gases in the air in a timely and reliable manner. [0003] Among the various materials used as gas sensors, semiconductor metal oxides such as SnO 2 , Fe 2 o 3 , ZnO, etc. occupy a large market share with the advantages of low price, small size, simple structure, high sensitivity, and fast response recovery. However, these...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
Inventor 苏慧兰宋钫张荻
Owner SHANGHAI JIAO TONG UNIV
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