Preparation method of silver-doped nano tin dioxide powder

A technology of nano-tin dioxide and powder materials, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as complex production process, harsh reaction conditions, and complicated operation, and achieve improved Gas sensitivity performance, narrow distribution range, good dispersion effect

Active Publication Date: 2012-12-26
PONOVO POWER
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  • Abstract
  • Description
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Problems solved by technology

The above methods all have problems such as high production cost, harsh reaction conditions, difficult process control, complex production process, and poor product performance.
Chinese patent CN1260133C discloses a method of preparing nano-SnO by precipitation method using metal tin powder / granule as raw material. 2 method, the production cost of this method is relatively high, and the precursors produced need to be ground and sieved after washing and drying to obtain nano-SnO with fine particle size. 2 Powder, unsatisfactory product yield, complicated operation

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  • Preparation method of silver-doped nano tin dioxide powder
  • Preparation method of silver-doped nano tin dioxide powder
  • Preparation method of silver-doped nano tin dioxide powder

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Weigh 3.506g of tin tetrachloride pentahydrate and 0.0085g of silver nitrate (so that the doping amount of silver is 0.5%), add deionized water to prepare 100ml of a mixed solution of 0.1mol / L, add 10ml of 0.1 mol / L citric acid solution and 2 g polyethylene glycol 4000, configure 500ml 0.1mol / L ammonia solution, and slowly add the configured ammonia solution into the mixed solution with a basic burette to adjust the pH value of the reaction system To 8.5, react under constant temperature magnetic stirring at 80°C for 120min to generate a precursor sol; put the precursor sol into a hydrothermal reaction kettle, place it in an oven, and react under the condition of 150°C for 10h, and take out the The hydrothermal reaction kettle was cooled to room temperature and sampled; the sample was ultrasonically washed 10 times with deionized water and 10 times with absolute ethanol, dried at 80°C for 12 hours, and ground to make nano-tin dioxide powder Body finished product, the pa...

Embodiment 2

[0026] Weigh 2.256g of stannous chloride dihydrate and 0.017g of silver nitrate (so that the doping amount of silver is 1%), add deionized water to prepare 100ml of a mixed solution of 0.1mol / L, add 10ml of 0.1 mol / L citric acid solution and 2 g polyethylene glycol 4000, configure 500ml 0.2mol / L ammonia solution, slowly add the configured ammonia solution into the mixed solution with a basic burette, and adjust the pH value of the reaction system To 9, react for 120 minutes under constant temperature magnetic stirring at 80°C to generate a precursor sol; put the precursor sol into a hydrothermal reaction kettle, place it in an oven, and perform a hydrothermal reaction at 160°C for 12 hours, then take out the The hydrothermal reaction kettle was cooled to room temperature and sampled; the sample was ultrasonically washed 10 times with deionized water and 10 times with absolute ethanol, dried at 90°C for 12 hours, and ground to make nano-tin dioxide powder finished product. Its...

Embodiment 3

[0028] Weigh 7.012g of tin tetrachloride pentahydrate and 0.068g of silver nitrate (so that the doping amount of silver is 2%), add deionized water to prepare 100ml of a mixed solution of 0.2mol / L, add 10ml of 0.1 mol / L citric acid solution and 2 g polyethylene glycol 4000, configure 500ml 0.3mol / L ammonia solution, slowly add the configured ammonia solution into the mixed solution with a basic burette, and adjust the pH value of the reaction system To 9.5, react under constant temperature magnetic stirring at 80°C for 120min to generate a precursor sol; put the precursor sol into a hydrothermal reaction kettle, place it in an oven, and conduct a hydrothermal reaction at 170°C for 14h, then take out the Hydrothermal reaction kettle, cooled to room temperature, sampling; the sample was ultrasonically washed 10 times with deionized water and 10 times with absolute ethanol, dried at 100°C for 12 hours, and ground to make nano-tin dioxide powder Body finished product, the particle...

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Abstract

The invention belongs to the technical field of preparation of tin dioxide powder, and relates to a preparation method of silver-doped nano tin dioxide powder. The preparation method comprises the following steps of: firstly adding citric acid solution, a surface active agent and ammonia water sequentially into mixed solution of soluble tin salt and soluble silver salt, and adjusting the pH value of a reaction system to 2.5-11, and under the action of constant-temperature magnetic stirring, generating precursor sol; then, adding the precursor sol into a hydrothermal reaction kettle, putting the hydrothermal reaction kettle in a drying oven, carrying out hydrothermal reaction, taking out the hydrothermal reaction kettle after hydrothermal reaction, cooling, and sampling; and finally, cleaning, drying and grinding to prepare a finished nano tin dioxide powder product. The tin dioxide powder prepared by the method has the advantages of fewer granularity, narrow distribution range and good dispersity; and a gas sensor based on the tin dioxide powder material has good detection performance for fault gas in transformer oil.

Description

technical field [0001] The invention belongs to the technical field of tin dioxide powder preparation, in particular to a preparation method of silver-doped nano tin dioxide powder material. Background technique [0002] On-line monitoring of dissolved gas in transformer oil is one of the key technologies for the implementation of condition-based maintenance of power transformers. Sensor gas detection technology is the core of on-line monitoring of dissolved gas in oil, which directly affects the correctness, stability and service life of the online monitoring system. Semiconductor metal oxide SnO 2 Base gas sensor is currently the most commonly used gas sensor for on-line monitoring of dissolved gas in oil. For the detection of trace hydrocarbon gas dissolved in oil, there are poor selectivity, serious cross-sensitivity, insufficient sensitivity, high working temperature, poor stability, and repeatability. Insufficient performance and other shortcomings, noble metal doping...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02B82Y30/00
Inventor 陈卫赵景峰
Owner PONOVO POWER
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