Cadmium sulfide coating carbon nano tube gas-sensitive material and manufacture method of gas-sensitive element

A technology of gas-sensing materials and manufacturing methods, applied in the direction of material resistance, etc., can solve the problems of rare cadmium sulfide gas-sensing materials, low cadmium sulfide carrier density, increased material instability, etc., and achieve fast response and recovery speed , the synthesis method is simple and easy, and the structure is simple

Inactive Publication Date: 2009-11-18
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Three series of materials SnO as gas sensitive materials 2 , ZnO and Fe 2 o 3 Such materials are widely used and the technology is mature, but there are defects such as high operating temperature (350-450°C), high energy consumption, potential safety hazards, and poor selectivity.
High sensitivity, normal temperature use, fast response, high selectivity, and long-term stability cannot be satisfied at the same time, and often one aspect is met, while other aspects fail to meet the requirements
In order to improve their performance, precious metals are often adde

Method used

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  • Cadmium sulfide coating carbon nano tube gas-sensitive material and manufacture method of gas-sensitive element
  • Cadmium sulfide coating carbon nano tube gas-sensitive material and manufacture method of gas-sensitive element
  • Cadmium sulfide coating carbon nano tube gas-sensitive material and manufacture method of gas-sensitive element

Examples

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Embodiment 1

[0021] Embodiment 1: 0.1g diameter 40~60nm, multi-walled carbon nanotube of length 5~15 microns is placed in the 250mL Erlenmeyer flask that is placed the distilled water of 80-100mL, at room temperature at 100W, 40Hz ultrasonic dispersion 5- After 10 minutes, add 0.375g of thioacetamide, then ultrasonically disperse for 3~4min, then add 1.33g of cadmium acetate and ultrasonically disperse for 30min, then reflux in a water bath at 60℃~90℃ for 0.5~6 hours, cool, filter and wash thoroughly dry. The powder synthesized by this method (this powder is cadmium sulfide coated carbon nanotube gas-sensitive material) is prepared into a slurry with glycerin, and then coated on an Al alloy with a heating wire and a gold or platinum electrode. 2 o 3 On ceramic tubes, see figure 1 and figure 2 , sintering at a constant temperature of 400-500°C for 2-5 hours, then soldering, packaging, and electrical aging, that is, to obtain a side-heated gas sensor with high sensitivity to ethanol and ...

Embodiment 2

[0022]Example 2: Place 0.1 g of multi-walled carbon nanotubes with a diameter of 40-60 nm and a length of 5-15 microns in a 250-mL Erlenmeyer flask with 100 mL of distilled water, after 5-10 min of ultrasonic dispersion at 100 W and 40 Hz at room temperature , add 0.45g of thioacetamide and then ultrasonically disperse for 3~4min, then add 1.33g of cadmium acetate and ultrasonically disperse for 30min, then bathe in water at 60°C--90°C for 0.5~6 hours, cool and filter and fully wash and dry. The powder synthesized by this method (this powder is cadmium sulfide coated carbon nanotube gas-sensitive material) is prepared into a slurry with glycerin, and then coated on an Al alloy with a heating wire and a gold or platinum electrode. 2 o 3 On ceramic tubes, see figure 1 and figure 2 , sintering at a constant temperature of 400-500°C for 2-5 hours, then soldering, packaging, and electrical aging, that is, to obtain a side-heated gas sensor with high sensitivity to ethanol and go...

Embodiment 3

[0023] Example 3: 0.1 g of multi-walled carbon nanotubes with a diameter of 40 to 60 nm and a length of 5 to 15 microns are placed in a 250 mL Erlenmeyer flask with 100 mL of distilled water, and after 5-10 min of ultrasonic dispersion at 100 W and 40 Hz at room temperature , add 0.563g of thioacetamide and then ultrasonically disperse for 3~4min, then add 1.33g of cadmium acetate and ultrasonically disperse for 30min, then put in a water bath at 60°C-90°C for 0.5~6 hours, cool and filter and fully wash and dry. The powder synthesized by this method (this powder is cadmium sulfide coated carbon nanotube gas-sensitive material) is prepared into a slurry with glycerin, and then coated on an Al alloy with a heating wire and a gold or platinum electrode. 2 o 3 On ceramic tubes, see figure 1 and figure 2 , sintering at a constant temperature of 400-500°C for 2-5 hours, then soldering, packaging, and electrical aging, that is, to obtain a side-heated gas sensor with high sensitiv...

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Abstract

The invention discloses a cadmium sulfide coating carbon nano tube gas-sensitive material and a manufacture method of a gas-sensitive element. The manufacture method comprises the following steps: a carbon nano tube is processed by ultrasonic dispersion in the room temperature, and then a certain amount of thiacetamide and cadmium acetate is sequentially added; after that, the mixture is processed by the ultrasound for half an hour and placed in the water bath of 60 DEG C to 90 DEG C to be blended for 0.5 to 6 hours, thus obtaining the cadmium sulfide coating multi-walled carbon nano-tube nano powder material; after being dried in vacuum, the power material is prepared into sizing agent which is coated on a ceramic tube carrier, undergoes heat treatment of 400 to 500 DEG C, is welded and encapsulated and undergoes the electrical ageing, thus obtaining the side-heating type gas-sensitive element which has high sensitivity and good selectivity of ethanol gas. The gas-sensitive element has the simple structure, low request on manufacturing techniques and use conditions, convenient and reliable use, and low manufacturing cost.

Description

technical field [0001] The invention belongs to the field of semiconductor gas-sensitive sensors, and relates to a method for manufacturing a cadmium sulfide-coated carbon nanotube gas-sensitive material and a gas-sensitive element. Background technique [0002] Three series of materials SnO as gas sensitive materials 2 , ZnO and Fe 2 o 3 Such materials are widely used and the technology is mature, but there are defects such as high operating temperature (350-450°C), high energy consumption, potential safety hazards, and poor selectivity. High sensitivity, normal temperature use, fast response, high selectivity, and long-term stability cannot be satisfied at the same time, and often one aspect is met, while other aspects fail to meet the requirements. In order to improve their performance, noble metals are often added as catalysts, which is complicated to make, expensive, and increases the instability of the material, shortening the working life. Cadmium sulfide, as an i...

Claims

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Application Information

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IPC IPC(8): G01N27/12
Inventor 唐新村肖元化王志敏李连兴瞿毅曾智文陈亮罗卓陈静波
Owner CENT SOUTH UNIV
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