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Graded core-shell SnO2 microspheres as well as preparation method and application thereof

A technology of microspheres and cores, applied in the analysis of materials, material analysis by electromagnetic means, instruments, etc., can solve the problems of long response recovery time, high working temperature, poor sensitivity, etc., and achieve the promotion of adsorption and transmission, large pores The effect of high efficiency and raw materials is environmentally friendly and easy to obtain

Active Publication Date: 2019-12-24
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing tin dioxide semiconductor metal oxide gas-sensing materials have problems such as high working temperature, poor sensitivity, and long response recovery time when detecting VOCs gas.
Secondly, most of the synthesis process of semiconductor metal oxides will use various surfactants and other additives. These additive materials have defects such as expensive, complicated sources, and not environmentally friendly.
In addition, pure metal oxide gas-sensing materials have problems such as poor selectivity in practical applications, which can be improved by doping metal elements.

Method used

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  • Graded core-shell SnO2 microspheres as well as preparation method and application thereof
  • Graded core-shell SnO2 microspheres as well as preparation method and application thereof
  • Graded core-shell SnO2 microspheres as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0045] A Hierarchical Core-Shell SnO 2 Microsphere, its preparation method comprises the steps:

[0046] 1) Weigh 0.65g SnSO with an analytical balance 4 Put the powder in a 50ml beaker, then use a measuring cylinder to measure 30ml of deionized water and pour it into the beaker, then place the beaker on a magnetic stirrer to stir, then continue to weigh 1.19g of D-glucose powder with a balance and slowly pour it into the In the stirring beaker, finally weigh 0.36g of urea particles and slowly pour it into the stirring beaker, and continue magnetic stirring for 60min to obtain a suspended precursor solution;

[0047] 2) Transfer the obtained precursor liquid into a 100ml hydrothermal reaction kettle, and react in a constant temperature box at 180°C for 12 hours. After the reaction is completed and cooled naturally, use deionized water and ethanol to cross-centrifuge and wash 3 times each to obtain a dark brown precipitate. The precipitate was dried overnight at 80°C, and the d...

Embodiment 2

[0050] A Hierarchical Core-Shell SnO 2 Microsphere, its preparation method comprises the steps:

[0051] 1) Weigh 0.64gSnSO4 with an analytical balance 4 Put the powder in a 50ml beaker, then use a measuring cylinder to measure 30ml of deionized water and pour it into the beaker, then place the beaker on a magnetic stirrer to stir, then continue to weigh 1.18g of D-glucose powder with a balance and slowly pour it into the stirring Finally, weigh 0.36g of urea particles and slowly pour it into the stirring beaker, and continue magnetic stirring for 60min to obtain a suspension of the precursor solution;

[0052] 2) Transfer the obtained precursor solution into a 100ml hydrothermal reaction kettle, and react in a constant temperature box at 180°C for 24 hours. After the reaction is completed and cooled naturally, use deionized water and ethanol to cross-centrifuge and wash 3 times each to obtain a dark brown precipitate. The precipitate was dried overnight at 80°C, and the dri...

Embodiment 3

[0055] A Hierarchical Core-Shell SnO 2 Microsphere, its preparation method comprises the steps:

[0056] 1) Weigh 0.62gSnSO4 with an analytical balance 4 Put the powder in a 50ml beaker, then use a measuring cylinder to measure 30ml of deionized water and pour it into the beaker, then put the beaker on a magnetic stirrer to stir, then continue to weigh 1.19g of D-glucose powder with a balance and slowly pour it into the stirring Finally, weigh 0.35g of urea particles and slowly pour it into the stirring beaker, and continue magnetic stirring for 60min to obtain a suspension of the precursor solution;

[0057] 2) Transfer the precursor liquid into a 100ml hydrothermal reaction kettle, and react in a constant temperature box at 180°C for 18 hours. After the reaction is completed and cooled naturally, use deionized water and ethanol to cross-centrifuge and wash 3 times each to obtain a dark brown precipitate. The precipitate was dried overnight at 80°C, and the dried precipitat...

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Abstract

The invention discloses a graded core-shell SnO2 microsphere material, which has a graded core-shell structure composed of tin dioxide nanoparticles, the microsphere size is 0.5-1 [mu] m, and the outer layer shell thickness is 40-60 nm. A preparation process comprises the following steps: dissolving a tin salt in water, stirring, sequentially adding glucose and urea, and continuously stirring to form a precursor solution; and carrying out hydrothermal reaction on the precursor solution, and then carrying out centrifugal washing, drying and calcining to obtain the graded core-shell SnO2 microsphere nano material. When being used as a gas sensitive material of a gas sensor, the microsphere material can show excellent gas sensitive response performance, and the related preparation method is environment-friendly, simple to operate, controllable in process and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of nanomaterials, in particular to a graded core-shell SnO 2 Microspheres and methods of preparation and applications thereof. Background technique [0002] Semiconductor metal oxide nanomaterials as gas sensitive materials have high sensitivity, fast response recovery time and low cost, and are the most widely used gas sensitive materials. where SnO 2 It is a wide bandgap (~3.6eV) n-type semiconductor metal oxide, which has good chemical stability, physical and mechanical properties and photoelectric properties, and is a widely used semiconductor metal oxide gas-sensing material. [0003] The existing tin dioxide semiconductor metal oxide gas-sensing materials have problems such as high working temperature, poor sensitivity, and long response recovery time when detecting VOCs gas. Secondly, most of the synthesis processes of semiconductor metal oxides use additives such as various surfactants. These additive mater...

Claims

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Application Information

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IPC IPC(8): C01G19/02G01N27/12
CPCC01G19/02G01N27/127C01P2004/32C01P2004/62C01P2004/64C01P2006/80C01P2004/50
Inventor 刘善堂郑力毕文杰
Owner WUHAN INSTITUTE OF TECHNOLOGY
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