A kind of gas-sensitive film sensor of the compound structure of basic cobalt carbonate and rgo and preparation method thereof

A thin-film sensor and composite structure technology, applied in the field of sensing, can solve the problems of cumbersome preparation process, lack of adsorption sites of RGO, low conductivity of basic cobalt carbonate, etc., to shorten the process, reduce the interference of environmental noise, and save costs Effect

Active Publication Date: 2020-03-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems in the prior art, the object of the present invention is to propose a gas-sensitive thin film sensor of a composite structure of basic cobalt carbonate and RGO and a preparation method thereof. The present invention can overcome the complicated preparation process, and basic cobalt carbonate Due to the low electrical conductivity of RGO and the lack of sufficient adsorption sites for RGO, a gas-sensitive film sensor with a composite structure of basic cobalt carbonate and RGO can be prepared by a one-step hydrothermal method, which greatly improves the gas-sensing response

Method used

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  • A kind of gas-sensitive film sensor of the compound structure of basic cobalt carbonate and rgo and preparation method thereof
  • A kind of gas-sensitive film sensor of the compound structure of basic cobalt carbonate and rgo and preparation method thereof
  • A kind of gas-sensitive film sensor of the compound structure of basic cobalt carbonate and rgo and preparation method thereof

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preparation example Construction

[0029] The preparation method of the gas-sensitive film sensor of the composite structure of basic cobalt carbonate of the present invention and RGO comprises the steps:

[0030] 1) Preparation of mixed reaction solution

[0031] 1.1) Preparation of graphene oxide dispersion

[0032] Take 1-40 mg of graphene oxide, put it into 30 ml of deionized water and shake it for 10-60 minutes, and then sonicate for 4-24 hours to obtain a uniformly dispersed graphene oxide dispersion.

[0033] 1.2) Preparation of the mixed solution of cobalt chloride hexahydrate and urea

[0034] Weigh 0.5-2.5g of cobalt chloride hexahydrate and 0.5-2.5g of urea, then add them into 30ml of deionized water, ultrasonicate for 3 minutes, and stir continuously for 10 minutes with a magnetic stirrer to make cobalt chloride hexahydrate and urea completely Dissolve in deionized water and mix well.

[0035] 1.3) The mixing process of the graphene oxide dispersion and the mixed solution of cobalt chloride hexah...

Embodiment 1

[0045] The method for preparing the gas-sensitive film sensor of the composite structure of basic cobalt carbonate and RGO of the present embodiment comprises the following steps:

[0046] 1) Preparation of mixed reaction solution

[0047] 1.1) Preparation of graphene oxide dispersion

[0048] Take 20 mg of graphene oxide, put it into 30 ml of deionized water and shake it for 30 minutes, and then sonicate it for 8 hours to obtain a uniformly dispersed graphene oxide dispersion.

[0049] 1.2) Preparation of the mixed solution of cobalt chloride hexahydrate and urea

[0050] Weigh 1g of cobalt chloride hexahydrate and 1g of urea, then add them to 30ml of deionized water, ultrasonicate for 3 minutes, and stir continuously for 10 minutes with a magnetic stirrer, so that cobalt chloride hexahydrate and urea are completely dissolved in deionized water and mixed uniform.

[0051] 1.3) The mixing process of the graphene oxide dispersion and the mixed solution of cobalt chloride hex...

Embodiment 2

[0066] The method for preparing the gas-sensitive film sensor of the composite structure of basic cobalt carbonate and RGO of the present embodiment comprises the following steps:

[0067] 1) Preparation of mixed reaction solution

[0068] 1.1) Preparation of graphene oxide dispersion

[0069] Take 1 mg of graphene oxide, put it into 30 ml of deionized water and shake it for 10 minutes, and then sonicate it for 4 hours to obtain a uniformly dispersed graphene oxide dispersion.

[0070] 1.2) Preparation of the mixed solution of cobalt chloride hexahydrate and urea

[0071] Weigh 0.5g of cobalt chloride hexahydrate and 0.5g of urea, then add them into 30ml of deionized water, ultrasonicate for 3 minutes, and stir continuously for 10 minutes with a magnetic stirrer, so that cobalt chloride hexahydrate and urea are completely dissolved in deionized water and mix completely.

[0072] 1.3) The mixing process of the graphene oxide dispersion and the mixed solution of cobalt chlori...

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Abstract

The invention discloses a gas-sensitive film sensor with a basic cobalt carbonate and RGO composite structure and a preparation method of the gas-sensitive film sensor. The preparation method comprises the following steps: firstly preparing graphene oxide dispersion liquid, then further uniformly mixing the graphene oxide dispersion liquid with a mixed liquid of cobalt chloride hexahydrate and urea, obtaining a gas-sensitive film with a basic cobalt carbonate and RGO composite structure by adopting a one-step hydrothermal method, dropwise coating the gas-sensitive film on a clean interdigitalelectrode, and carrying out drying at 40-80 DEG C for 1-60 minutes to obtain the gas-sensitive film with the basic cobalt carbonate and RGO composite structure. The defects of a traditional sensor canbe overcome, the preparation process is simplified, and meanwhile room temperature detection is achieved. The problem of low conductivity of the basic cobalt carbonate material is overcome, and the conductivity of the material is improved by introducing RGO, so that the influence of environmental noise is greatly reduced. The defect of insufficient gas adsorption sites of RGO is overcome, a largenumber of gas molecule adsorption sites are provided for the sensor by introducing the basic cobalt carbonate, and the gas sensitive response of the sensor is greatly improved.

Description

technical field [0001] The invention belongs to the field of sensing technology, and relates to the preparation of a gas-sensitive thin film sensor with a composite structure of basic cobalt carbonate and RGO, in particular to a gas-sensitive thin film sensor with a composite structure of basic cobalt carbonate and RGO and a preparation method thereof. Background technique [0002] At present, the gas-sensing materials used in the field of gas-sensing sensors are mainly metal oxides, which are widely praised by researchers all over the world because of their fast response speed and high gas-sensing response. However, its relatively cumbersome preparation process (usually prepared by hydrothermal method and high-temperature annealing treatment), makes the production cost of metal oxides high. At the same time, metal oxides must be heated to a certain temperature (100-400°C) to have a better gas-sensing response to gases. This will not only increase energy loss, which is not ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
Inventor 李昕王常刘卫华崔宏旺刘康朱莉
Owner XI AN JIAOTONG UNIV
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