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Method for preparing antimony doped stannic oxide nanometer electricity-conductive powder

A tin dioxide and nano-conducting technology is applied in the field of preparing antimony-doped tin dioxide nano-conducting powder by gas-phase combustion method, which can solve the problem that it is difficult to obtain small-sized, distributed nano-crystals, difficult to remove chloride ions, and difficult to doping amount. control and other problems, to achieve the effect of small size, simple equipment and good dispersion

Active Publication Date: 2006-12-13
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to obtain high-quality SnO2 nanocrystals with these preparation methods at present, because the chloride ions in the precipitation solution are difficult to remove, and the product loss is large during the preparation process, the recovery rate is low, and the doped It is difficult to control the amount of impurities, and it is difficult to obtain small-sized and uniformly distributed nanocrystals during burning due to the effect of adsorbed water

Method used

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  • Method for preparing antimony doped stannic oxide nanometer electricity-conductive powder
  • Method for preparing antimony doped stannic oxide nanometer electricity-conductive powder
  • Method for preparing antimony doped stannic oxide nanometer electricity-conductive powder

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Embodiment 1

[0026] The mixed solution of tin tetrachloride, antimony trichloride and absolute ethanol (mass ratio is 10:0.5-1.5:100, flow rate 30ml / min) is N 2 (1m 3 / h) loaded into the evaporator, the temperature of the evaporator is controlled at 150°C, the vaporized and preheated air (200°C, 3m 3 / h), central tube hydrogen (0.2m 3 / h) After uniform mixing, it enters the combustion reactor from the center tube of the burner. Bicyclic hydrogen (1m 3 / h) and the second ring air (0.5m 3 The mixed gas of / h) is added from the second ring inlet to form an annular auxiliary flame, which is used to maintain the stability of the central jet flame and adjust the temperature of the reaction zone. There is another three-ring air (10m 3 / h) Added via three rings, the hydrolysis reaction of the precursor is carried out in the combustion chamber. The prepared ATO nano conductive powder has an average diameter of 8.5nm and good dispersion. See figure 2 .

Embodiment 2

[0028] The mixed solution of tin tetrachloride, antimony trichloride and absolute ethanol (mass ratio is 10:0.5-1.5:100, flow rate 10ml / min) is mixed with N 2 (1.5m 3 / h) loaded into the evaporator, the temperature of the evaporator is controlled at 250°C, the vaporized and preheated air (250°C, 3m 3 / h), central tube hydrogen (0.8m 3 / h) After uniform mixing, it enters the combustion reactor from the center tube of the burner. Bicyclic hydrogen (3m 3 / h) and the second ring air (1m 3 The mixed gas of / h) is added from the second ring inlet to form an annular auxiliary flame, which is used to maintain the stability of the central jet flame and adjust the temperature of the reaction zone. There is another three-ring air (3m 3 / h) Added via three rings, the hydrolysis reaction of the precursor is carried out in the combustion chamber. The prepared ATO nano conductive powder has an average diameter of 22nm and good dispersion. See image 3 .

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Abstract

The invention discloses a method for preparing nanometer conductive powder mixed with stannic oxide, comprising following steps: evaporating mixed solution of tin tetrachloride, antimony trichloride and alcohol in evaporator loaded by nitrogen; mixing with hydrogen and air, entering into combustor through central tube of three-channel nozzle installed on top of combustor, proceeding hydrolytic reaction; collecting produced ATO conductive powder with bag filter, discharging exhaust gas after passing hydrogen chloride absorbing tower; adding hydrogen and air into combustor through three-channel nozzle at the same time; and adding air through three-race pipe of three-channel nozzle. The invention is characterized by simple device and high controllable degree. ATO nanometer conductive powder of small size, large specific surface area and good dispersibility can be prepared.

Description

technical field [0001] The invention relates to a method for tin dioxide nano conductive powder, in particular to a method for preparing antimony-doped tin dioxide nano conductive powder by a gas phase combustion method. Background technique [0002] Antimony-doped tin oxide (Anmony-doped tin oxide ATO) is a new multifunctional material, which is widely used because of its high temperature resistance, corrosion resistance and good mechanical stability. As a new type of conductive filler, it can be used for antistatic materials, and its effect is better than that of traditional carbon black, metal powder, surfactant, etc., and its cost performance is higher than that of the recently proposed carbon nanotube conductive material. The electrochromic material can replace the commonly used WO material. It can be used as a gas-sensing material to detect reducing combustible gases. Compared with pure tin oxide gas-sensing materials, its sensitivity and selectivity are better due to...

Claims

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Application Information

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IPC IPC(8): B22F9/16
Inventor 李春忠胡彦杰姜海波顾峰
Owner EAST CHINA UNIV OF SCI & TECH
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