Layered double hydroxide/graphene nano composite gas sensitive material and preparation method thereof, and application in detection of nitrogen dioxide

A layered bimetal and hydroxide technology, applied in graphene, chemical instruments and methods, nano-carbon, etc., can solve problems such as long response recovery time, weak response signal, sensor detection limit, poor conductivity, etc.

Pending Publication Date: 2020-10-27
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing LDH-based gas-sensing materials are prone to stacking and agglomeration, poor conductivity and other problems, which lead to their low concentration of NO 2 Shortcomings such as long response rec...

Method used

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  • Layered double hydroxide/graphene nano composite gas sensitive material and preparation method thereof, and application in detection of nitrogen dioxide
  • Layered double hydroxide/graphene nano composite gas sensitive material and preparation method thereof, and application in detection of nitrogen dioxide
  • Layered double hydroxide/graphene nano composite gas sensitive material and preparation method thereof, and application in detection of nitrogen dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1: Preparation of Graphene Oxide

[0023] Graphene oxide was prepared by the traditional Hummers method. Place a 250ml reaction bottle in an ice-water bath, slowly pour 30ml of concentrated sulfuric acid, add 1g of graphite powder and 0.5g of sodium nitrate under constant stirring, and then slowly add 5g of potassium permanganate, and control the reaction temperature not to exceed 20°C. After stirring for 30 minutes, raise the temperature to 35°C, continue to stir for 30 minutes, then add 40ml of deionized water, raise the temperature to 98°C, continue heating for 20 minutes, the solution is brownish yellow, then add 5ml of hydrogen peroxide, filter the sample while it is hot, It was washed with hydrochloric acid and deionized water, and finally fully dried in a 60°C drying oven.

[0024] Step 2: Preparation of ZnTi-LDH / GO nanocomposite

[0025] Using urea as alkali source, ZnTi-LDH / GO with three-dimensional structure was prepared by hydrothermal method. Measure...

Embodiment 2

[0034]The difference between this embodiment and embodiment 1 is: the amount of graphene oxide in step 2 is increased to 4.92g.

Embodiment 3

[0036] The difference between this embodiment and embodiment 1 is: the amount of graphene oxide in step (2) is reduced to 0.55g.

[0037] Such as figure 1 Shown, the ZnTi-LDH / GO nanocomposite material that embodiment 1 makes, its LDH grows on the graphene nanosheet with the form of nanosheet, distributes evenly and densely, and the specific surface area of ​​the three-dimensional structure that forms is big; figure 2 Shown, the ZnTi-LDH / GO nanocomposite material that the graphene oxide amount that embodiment 2 makes increases, along with the increase of graphene oxide, the phenomenon that local lamellar accumulation, agglomeration into particle has occurred; image 3 As shown, the ZnTi-LDH / GO nanocomposite material with reduced graphene oxide content obtained in Example 3, with the increase and decrease of graphene oxide, the phenomenon of lamellar accumulation and disordered structure appeared. In summary, when the concentration of graphene oxide in the reaction solution is...

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Abstract

The invention discloses a layered double hydroxide/graphene nano composite gas sensitive material prepared by a one-step hydrothermal process. According to the invention, the temperature, the ratio oftwo materials and the like in a hydrothermal reaction process are regulated and controlled, so that uniform coverage of LDH nanosheets on the surface of lamellar graphene can be realized, a three-dimensional composite structure which is large in specific surface area, high in conductivity and good in carrier channel is formed, the problems of disordered stacking of a composite material structureand poor performance caused by difficulty in uniform layered compounding of LDH and graphene in a traditional direct mixing method are solved, the room-temperature gas sensitive properties such as sensitivity, response speed, detection limit and the like of the layered double hydroxide-based gas sensor are remarkably improved, and ultrahigh room-temperature sensitivity and ultrafast room-temperature response of the sensor to ppb-grade trace NO2 are realized.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and relates to a layered double metal hydroxide / graphene (ZnTi-LDH / GO) nanocomposite gas-sensing material and its preparation method and its application in detecting nitrogen dioxide. Nitric oxide has ultra-high room temperature sensitivity and ultra-fast room temperature response characteristics. Background technique [0002] Due to the increase of nitrogen dioxide produced by fuel combustion, urban vehicle exhaust and industrial production, acid rain and photochemical smog have become more serious and widespread, and the ecological environment has been severely damaged. The existence of nitrogen dioxide has also caused a great threat to human health. Even if exposed to nitrogen dioxide for a short time, lung function will be damaged. When the concentration of nitrogen dioxide reaches 10ppm, the eyes, nose and respiratory tract will all be Under strong stimulation, children, the elderly and...

Claims

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Application Information

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IPC IPC(8): C01B32/184C01G23/00G01N27/12
CPCC01B32/184C01G23/002G01N27/127G01N27/12C01P2004/03C01P2002/72C01P2004/80
Inventor 秦玉香赵汝苓王杰微白晨香
Owner TIANJIN UNIV
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