Unlock instant, AI-driven research and patent intelligence for your innovation.

Co, N-GQDs-COOH/SnO2 nano composite material as well as preparation method and application thereof

A nanocomposite material and composite material technology, which is applied in the field of Co,N-GQDs-COOH/SnO2 nanocomposite materials, can solve the problems of poor specificity of formaldehyde gas, limit the use of sensors, interference, etc., to promote migration and realize large-scale production. , the effect of increasing the hole concentration

Pending Publication Date: 2022-01-25
AEROSPACE INFORMATION RES INST CAS
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the general problem of this type of sensor is that the specificity of formaldehyde gas is poor, and it is seriously interfered by reducing gases such as benzene, toluene, ethanol, etc., which seriously limits the practical use of sensors in portable devices.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Co, N-GQDs-COOH/SnO2 nano composite material as well as preparation method and application thereof
  • Co, N-GQDs-COOH/SnO2 nano composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Synthesis of Co,N-GQDs-COOH: 8 mmol of citric acid monohydrate (C 6 h 10 o 8 ), 24mmol of urea and 24mmol of CoCl 2 ·6H 2 O was dissolved in 40 mL of deionized water, and stirred at room temperature for 5 min until the solution was clear to obtain a mixed solution. Transfer the mixed solution to a 50mL Teflon-lined stainless steel autoclave, put the stainless steel autoclave into an electric blast drying oven, and react at 180°C for 8 hours; after the reaction, put the stainless steel autoclave Take it out from the dry box, cool it to room temperature in the open air, collect the solution in the stainless steel autoclave; add ethanol to the solution and perform high-speed centrifugation, the amount of ethanol added is 20 times the volume of the solution, and the centrifugation speed is 7500rpm , the time was 20min, the precipitate was collected after centrifugation, and dried in air at 80°C for 12h to obtain a Co,N-GQDs-COOH powder.

[0042] (2) Porous SnO 2 S...

Embodiment 2

[0052] (1) Synthesis of Co,N-GQDs-COOH: 8 mmol of citric acid monohydrate (C 6 h 10 o 8 ), 16mmol of urea and 16mmol of CoCl 2 ·6H 2 O was dissolved in 40 mL of deionized water, and stirred at room temperature for 5 min until the solution was clear to obtain a mixed solution. Transfer the mixed solution to a 50mL Teflon-lined stainless steel autoclave, put the stainless steel autoclave into an electric blast drying oven, and react at 180°C for 8 hours; after the reaction, put the stainless steel autoclave Take it out from the dry box, cool it to room temperature in the open air, and collect the solution in the stainless steel autoclave; add ethanol to the solution and perform high-speed centrifugation, the amount of ethanol added is 25 times the volume of the solution, and the centrifugation speed is 10000rpm , the time is 15min, the precipitate is collected after centrifugation, and dried in the air at 80°C for 12h to obtain a Co,N-GQDs-COOH powder.

[0053] (2) Porous S...

Embodiment 3

[0062] (1) Synthesis of Co,N-GQDs-COOH: 8 mmol of citric acid monohydrate (C 6 h 10 o 8 ), 24mmol of urea and 24mmol of CoCl 2 ·6H 2 O was dissolved in 40 mL of deionized water, and stirred at room temperature for 5 min until the solution was clear to obtain a mixed solution. Transfer the mixed solution to a 50mL Teflon-lined stainless steel autoclave, put the stainless steel autoclave into an electric blast drying oven, and react at 180°C for 8 hours; after the reaction, put the stainless steel autoclave Take it out from the dry box, cool it to room temperature in the open air, and collect the solution in the stainless steel autoclave; add ethanol to the solution and perform high-speed centrifugation, the amount of ethanol added is 20 times the volume of the solution, and the centrifugation speed is 13000rpm , the time was 30min, the precipitate was collected after centrifugation, and the primary product was collected and dried at 80°C in air for 12h to obtain a Co,N-GQDs...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
The average diameteraaaaaaaaaa
The average thicknessaaaaaaaaaa
Average side lengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a Co, N-GQDs-COOH / SnO2 nano composite material as well as a preparation method and application thereof, and belongs to the technical field of gas sensors. The composite material is secondary particles formed by agglomerating primary particles, the primary particles take a porous SnO2 nano cubic material as a matrix, Co, N co-doped graphene quantum dots with carboxyl functional groups are doped in the matrix, and the doping amount of Co, N-GQDs-COOH in the secondary particles is 0.1%-0.5% of the mass of the porous SnO2 nano cubic material. The preparation method comprises the following steps: firstly, preparing Co, N-GQDs-COOH by adopting a hydrothermal reaction method, then preparing a porous SnO2 nano cubic material by adopting coprecipitation, high-temperature annealing and HNO3 etching methods, and finally, carrying out physical ultrasonic mixing to obtain the nano composite material. When the composite material is used in the formaldehyde sensor, the response time and the recovery time can be shortened, and the sensitivity to formaldehyde gas is improved.

Description

technical field [0001] The invention relates to a Co,N-GQDs-COOH / SnO 2 The nanocomposite material, preparation method and application thereof belong to the technical field of gas sensors. Background technique [0002] Formaldehyde, as a colorless gas with a pungent odor, can be continuously released from building decoration materials and household items, forming superimposed pollution, and is considered to be the most important pollutant in indoor air. Studies have shown that formaldehyde can not only cause nasal cavity cancer and sinus cancer, but also cause leukemia. my country's indoor air quality standard (GB / T 18883-2002) stipulates that the safe value of indoor formaldehyde should be lower than 0.10mg / m 3 , the U.S. Occupational Safety and Health Administration (OSHA) and the U.S. National Institute for Occupational Safety and Health (NIOSH) set the time-weighted allowable concentration and exposure limit of formaldehyde as 0.75ppm and 16ppb, respectively. According...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N27/12B82Y15/00B82Y30/00B82Y40/00
CPCG01N27/127B82Y15/00B82Y30/00B82Y40/00Y02E60/10
Inventor 孙建海陈婷婷薛宁张新晓马天军
Owner AEROSPACE INFORMATION RES INST CAS