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A 3dom In modified by n-gqds 2 o 3 Composite materials and their preparation methods and applications

A composite material, 3domin2o3 technology, applied in the field of N-GQDs modified 3DOMIn2O3 composite material and its preparation, can solve the problems of long recovery time, poor selectivity, unfavorable practical application, etc. Beneficial for adsorption

Active Publication Date: 2022-04-19
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, single-phase graphene materials are not conducive to practical applications due to long recovery time and poor selectivity in the gas sensing process.

Method used

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  • A 3dom In modified by n-gqds <sub>2</sub> o <sub>3</sub> Composite materials and their preparation methods and applications
  • A 3dom In modified by n-gqds <sub>2</sub> o <sub>3</sub> Composite materials and their preparation methods and applications
  • A 3dom In modified by n-gqds <sub>2</sub> o <sub>3</sub> Composite materials and their preparation methods and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A 3DOM In modified by N-GQDs 2 o 3 Preparation method of composite material:

[0026] (1) N-GQDs were synthesized by a one-step hydrothermal method. The specific steps were as follows: 10 mg of graphene oxide (synthesized by the improved Hummers method) was mixed with 18 mL of secondary water and 2.0 mL of ammonia water (28wt%), and ultrasonicated for 30 After 1 min, the mixture was transferred to a reaction kettle lined with polytetrafluoroethylene, solvothermally heated at 180 °C for 12 h, cooled to room temperature naturally, and the mixed solution was filtered through a 25 nm microporous membrane to remove the black precipitate, and the golden yellow filtrate was spun Concentrated by evaporation, and further purified in a 1000da dialysis bag for 1 day to remove excess ammonia, and dried in vacuum to obtain N-GQDs;

[0027] (2) Synthesis of 3DOM In by impregnation-calcination method 2 o 3 , the specific steps are:

[0028] (2a) Preparation of polystyrene microsp...

Embodiment 2

[0032] The difference from Example 1 is that the N-GQDs in step (1) is 0.5 mg.

Embodiment 3

[0034] The difference from Example 1 is that the N-GQDs in step (1) is 1.0 mg.

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Abstract

The invention belongs to the technical field of nanomaterials, and discloses a 3DOM In modified by N-GQDs 2 o 3 Composite materials and their preparation methods and applications. The composite material is made of 3DOM In 2 o 3 and its composition of N‑GQDs uniformly loaded on its surface and inside the channels. Disperse N‑GQDs in water and add 3DOM In 2 o 3 , N 2 After bubbling for 1-3 h, the temperature of the mixture was controlled at 150-180°C for hydrothermal reaction for 4-8 h, cooled to room temperature naturally, and finally vacuum-dried to obtain N‑GQDs-modified 3DOM In 2 o 3 composite material. The composite material in NO 2 Application as gas sensitive material in gas sensor. The present invention uses N-GQDs modified 3DOM In 2 o 3 , effectively overcome the inability of 2D graphene to enter 3DOM In 2 o 3 Inside the channel, it is impossible to form an effective heterojunction. It has good repeatability, selectivity, long-term stability and short response recovery time. It can achieve an actual detection concentration of 100 ppb and can be used for NO at ultra-low concentrations. 2 Content detection.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, in particular to a 3DOM In modified by N-GQDs 2 o 3 Composite materials and their preparation methods and applications. Background technique [0002] Nitrogen dioxide (NO 2 ) As one of the main components of air pollutants, it mainly comes from vehicle exhaust and fossil fuel combustion. Studies have shown that long-term exposure to NO concentrations above 1 ppm 2 In addition, it can cause respiratory diseases and even be life-threatening. Additionally, it can form acid rain and contribute to the formation of ozone, a major contributor to photochemical smog formation. Therefore, the development of an accurate, selective and rapid detection of NO 2 The gas sensor is of great significance for monitoring air quality and protecting human health. Resistive metal-oxide-semiconductor gas sensors have attracted widespread attention in recent years because of their low cost, practicality and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 要红昌吕雅坤李中军潘玉平
Owner ZHENGZHOU UNIV
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