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Polyhedral ferric oxide and preparation method thereof

A technology of ferric oxide and polyhedron, which is applied in the chemical industry, can solve the problems of cumbersome template removal process, high synthesis cost, and high working temperature, and achieve the effects of reduced contact resistance, good stability, and convenient process operation

Inactive Publication Date: 2018-03-06
HEFEI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the existing template method (hard template, soft template) has high synthesis cost, cumbersome template removal process, and the synthesized nanomaterials are largely limited by the template structure. The existing gas-sensitive materials still have poor selectivity and high working temperature. defect

Method used

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  • Polyhedral ferric oxide and preparation method thereof
  • Polyhedral ferric oxide and preparation method thereof

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Embodiment 1

[0021] see figure 1 , a polyhedral ferric oxide, the ferric oxide is a polyhedron, and according to the photographs taken after electron microscope observation, the size of the ferric oxide of the polyhedron can be between 50nm and 800nm.

Embodiment 2

[0023] The preparation method of polyhedral ferric oxide comprises the steps:

[0024] S1: first: get ferric chloride hexahydrate 0.81g, urea 0.6g and add in the mixed solution of 30ml deionized water and 15ml ethanol, obtain uniform solution under agitator stirring;

[0025] S2: Add the uniformly stirred solution into the inner tank of the autoclave, then put the autoclave into the oven, heat to 160°C, and keep it warm for 10 hours;

[0026] S3: After taking out the autoclave and cooling it down to room temperature naturally, take out the reaction product, wash it repeatedly with deionized water and absolute ethanol until the aqueous solution is neutral, centrifuge in a centrifuge to obtain a precipitate, see figure 1 , figure 2 , after drying, a polyhedral structure of Fe2O3 material is obtained.

[0027] After the ferric oxide is prepared, the electron microscope observation shows that the structure is polyhedral, and the size is concentrated between 50nm and 800nm. The ...

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Abstract

The invention discloses polyhedral ferric oxide and a preparation method thereof. Ferric oxide is polyhedral and has a size ranging from 50nm to 800nm. The polyhedral ferric oxide is mainly prepared from ferric chloride hexahydrate by the following steps: adding ferric chloride hexahydrate and urea into a mixed solution of deionized water and ethanol according to a mass ratio; adding the uniformlystirred solution into an inner container of an autoclave, then putting the autoclave into an oven, heating the autoclave to 150-170 DEG C, and keeping the temperature for 8-12 hours; taking out the autoclave, naturally cooling the autoclave to room temperature, taking out a reaction product, washing and centrifuging the reaction product, and drying the reaction product to obtain a ferric oxide material with a polyhedral structure. According to the preparation method provided by the invention, a non-spherical ferric oxide material prepared by a hydrothermal method can be widely applied to various fields, particularly used as a gas sensitive material, and can effectively and greatly reduce the contact resistance between particles and improve the gas sensitive performance of the material.

Description

technical field [0001] This field belongs to the technical field of chemical industry, and specifically relates to a polyhedral ferric oxide and a preparation method thereof. Background technique [0002] At present, in recent years, with the rapid development of social economy and industrial production technology, people are facing increasingly serious environmental pollution problems, and people pay more attention to the monitoring and detection of toxic and harmful gases, flammable and explosive gases, and air pollutants. As an effective gas detection tool, the gas sensor is widely used in industrial production monitoring, home environment security, atmospheric monitoring, medical treatment and national defense. Therefore, the development of gas sensors with good selectivity and high sensitivity has become a research hotspot at home and abroad in recent years. [0003] Recently, there are literature reports on the synthesis methods of ferric oxide with different micro-na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B82Y30/00B82Y40/00
CPCC01G49/06B82Y30/00B82Y40/00C01P2002/72C01P2004/62C01P2004/64
Inventor 徐泽忠韩成良廖凯
Owner HEFEI UNIV
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