Preparation method and application of three-dimensional hollow multilevel-structured stannic oxide gas-sensitive material

A gas-sensitive material and three-dimensional hollow technology, which is applied in the preparation and application of nanomaterials, can solve the problems of complex process, high cost of raw materials, unsuitable for mass production, etc., and achieve the effect of low cost, environmental friendliness and simple process

Inactive Publication Date: 2014-10-29
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method of preparation has high cost of raw materials and complicated process. Although it has good gas-sensing performance, it is not suitable for mass production.

Method used

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  • Preparation method and application of three-dimensional hollow multilevel-structured stannic oxide gas-sensitive material
  • Preparation method and application of three-dimensional hollow multilevel-structured stannic oxide gas-sensitive material
  • Preparation method and application of three-dimensional hollow multilevel-structured stannic oxide gas-sensitive material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Take 5 mg of C template in 45 mL of deionized water and ultrasonically disperse evenly, add 10 mL of thioglycolic acid, 0.5 mL of hydrochloric acid, 0.3 g of stannous chloride, and 0.5 g of urea in sequence, and stir to form a uniform mixed solution. Then, the obtained solution was transferred to a 100mL reaction kettle, and heated to 140°C in an oven for 6 hours to react; after the reaction was completed, the reaction kettle was taken out and cooled to room temperature under air, and the product was transferred to a centrifuge tube.

[0026] (2) The product was washed with deionized water and ethanol for 2-3 times each. After centrifugation, the precipitate was transferred to a petri dish and dried in an oven at 60°C for 24 hours to obtain a dark gray precursor.

[0027] (3) Put the tin oxide into a muffle furnace, raise the temperature at 1°C / min to 550°C for 5 hours, and then obtain off-white tin oxide powder with a three-dimensional sheet-like hollow multi-level ...

Embodiment 2

[0030] (1) Take the C template and disperse it evenly in deionized water by ultrasonic, add thioglycolic acid, hydrochloric acid, stannous chloride, and urea in sequence, and stir to form a uniform mixed solution. The concentration of added C template is 0.067mg / mL, the concentration of stannous chloride is 0.3mol / L, the volume ratio of stannous chloride solution and thioglycolic acid is 4500:1, and the volume ratio of stannous chloride solution and hydrochloric acid is 90 : 1; The mol ratio of described urea and stannous chloride is 3: 1. The obtained solution was transferred to a 100mL reaction kettle, and heated to 140°C in an oven for 8 hours to react; after the reaction was completed, the reaction kettle was taken out and cooled to room temperature under air, and the product was transferred to a centrifuge tube.

[0031] (2) The product was washed with deionized water and ethanol for 2-3 times each. After centrifugation, the precipitate was transferred to a petri dish and...

Embodiment 3

[0034] (1) Take the C template and disperse it evenly in deionized water by ultrasonic, add thioglycolic acid, hydrochloric acid, stannous chloride, and urea in sequence, and stir to form a uniform mixed solution. The concentration of C template added is 0.089mg / mL, the concentration of stannous chloride is 0.3mol / L, the volume ratio of stannous chloride solution and thioglycolic acid is 4500:1, and the volume ratio of stannous chloride solution and hydrochloric acid is 90 : 1; The mol ratio of described urea and stannous chloride is 4: 1. The obtained solution was transferred to a 100mL reaction kettle, and heated to 160°C in an oven for 6 hours to react; after the reaction was completed, the reaction kettle was taken out and cooled to room temperature under air, and the product was transferred to a centrifuge tube.

[0035] (2) The product was washed with deionized water and ethanol for 2-3 times each. After centrifugation, the precipitate was transferred to a petri dish and...

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Abstract

The invention relates to a preparation method and an application of a three-dimensional hollow multilevel-structured stannic oxide gas-sensitive material. The preparation method comprises the following steps: preparing a precursor via a hydrothermal synthesis method by taking carbon microspheres as templates, stannous chloride as a stannum source, mercaptoacetic acid as a surfactant and urea as a precipitant, and roasting so as to obtain the gas-sensitive material with stannic oxide nanosheet self-assembled three-dimensional floriated hollow multilevel structures, wherein the gas-sensitive material is between 300nm and 500nm in diameter. The preparation method is simple in process, low in cost and environment-friendly. According to the method provided by the invention, after the gas-sensitive property of a gas-sensitive sensor prepared from the gas-sensitive material is tested, the results show that a gas-sensitive element has relatively high sensitivity to ethyl alcohol, and the gas-sensitive sensor is short in response time and recovery time, so that the gas-sensitive sensor has high stability. Thus, the gas-sensitive material provided by the invention can be applied to the gas-sensitive sensor for the ethyl alcohol.

Description

technical field [0001] The invention belongs to the preparation and gas-sensing application of semiconductor oxide gas-sensitive materials, and relates to the field of preparation and application of nanometer materials. Background technique [0002] Tin oxide (SnO 2 ) is an important n-type semiconductor material with a large band gap (3.5-4.0eV) and unique optical, electrical, and magnetic properties. It can be used in solar cells, transparent conductive films, flat panel displays, Ultraviolet-visible lasers, detectors and gas sensors, etc., have a wide range of applications. [0003] Due to its small resistivity and high catalytic activity, the conductivity of tin oxide is very sensitive to the external environment, making it suitable as a high-sensitivity gas sensor. The principle of tin oxide as a gas sensor is the change in conductivity caused by the adsorption of the measured gas and the surface reaction process. By detecting the electrical signal, the gas-sensing pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02B82Y40/00B82Y30/00
Inventor 张慧慧宋鹏韩丹王琦肖红霞
Owner UNIV OF JINAN
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