Preparation method of Pd-nanoparticle-modified porous ZnO nanosheet gas-sensitive material and gas sensor

A technology of nano-particles and gas-sensing materials, which is applied in the field of preparation of new composite nano-gas-sensing materials and gas-sensing elements, which can solve problems such as low sensitivity, high operating temperature, and unsatisfactory operating temperature, and achieve high sensitivity and selectivity. Good results

Inactive Publication Date: 2013-05-08
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, acetone gas-sensitive materials are mainly ZnO materials, but they have disadvantages such as low sensitivity and high operating temperature.
The traditional doping modification method can greatly improve the sensitivity of the material, but the operating temperature is still not ideal, such as: doped WO 3 -ZnO and MoO 3 -ZnO has a sensitivity of about 60 to 20 ppm acetone gas, and the response-recovery time is 30 and 20 seconds respectively, but its operating temperature is as high as 500°C (Chinese patent CN 101162211A), which brings no change to practical applications.

Method used

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  • Preparation method of Pd-nanoparticle-modified porous ZnO nanosheet gas-sensitive material and gas sensor
  • Preparation method of Pd-nanoparticle-modified porous ZnO nanosheet gas-sensitive material and gas sensor
  • Preparation method of Pd-nanoparticle-modified porous ZnO nanosheet gas-sensitive material and gas sensor

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Experimental program
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Effect test

Embodiment 1

[0027] The prepared porous ZnO nanosheets were mixed with Pd nanoparticles, the content of Pd nanoparticles was 0.5%, ground in an agate mortar for 1 h, and calcined at 600 °C for 2 h to make a composite material of Pd nanoparticles modified ZnO. Then, the material was made into a slurry in terpineol, uniformly coated on the surface of the ceramic tube, then dried in an oven at 100°C for 1 h, then put into a muffle furnace for calcination at 540°C for 2 h, and then followed by Side heating conventional process, welding, packaging, aging, made of gas sensor. The gas sensitivity test results show that its sensitivity to 100 ppm acetone vapor is as high as 70, and the sensitivity to 500 ppm reaches 222, and the response-recovery time is 7 s and 8 s, respectively. Figure 4 shown.

Embodiment 2

[0029] The prepared porous ZnO nanosheets were mixed with Pd nanoparticles, the content of Pd nanoparticles was 0.4%, ground in an agate mortar for 30min, and calcined at 550°C for 1.5h to make a composite material of Pd nanoparticles modified ZnO. A slurry is made, evenly coated on the surface of the ceramic tube, then dried in an oven at 80°C for 1 hour, then placed in a muffle furnace for calcination at 560°C for 1.5 hours, and then welded, packaged, Aging, made of gas sensor. The gas sensitivity test results show that its sensitivity to 100 ppm acetone vapor is as high as 71, and the sensitivity to 500 ppm reaches 216, and the response-recovery time is 8 s and 9 s, respectively.

Embodiment 3

[0031] The prepared porous ZnO nanosheets were mixed with Pd nanoparticles, the content of Pd nanoparticles was 0.3%, ground in an agate mortar for 40min, and calcined at 550°C for 1h to make a composite material of Pd nanoparticles modified ZnO. The material was made into a slurry in terpineol, evenly coated on the surface of the ceramic tube, then dried in an oven at 90 °C for 1 h, then put into a muffle furnace for calcination at 500 °C for 1.8 h, and then followed by the side heating method Conventional process, welding, packaging, aging, made of gas sensor. The gas sensitivity test results show that its sensitivity to 100 ppm acetone vapor is as high as 68, and the sensitivity to 500 ppm reaches 209, and the response-recovery time is 10 s and 10 s, respectively.

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Abstract

The invention discloses a preparation method of a Pd-nanoparticle-modified porous ZnO nanosheet gas-sensitive material, which comprises the following steps: mixing and grinding porous monocrystalline ZnO nanosheets and Pd nanoparticles, wherein the weight of the Pd nanoparticles accounts for 0.3-0.8% of the total weight of the porous monocrystalline ZnO nanosheets and Pd nanoparticles; and calcining at 550-650 DEG C for 1-2 hours to obtain the Pd-nanoparticle-modified porous ZnO nanosheet gas-sensitive material. The Pd-nanoparticle-modified porous ZnO nanosheet gas-sensitive material has high sensitivity: the sensitivity for 100ppm acetone gas is up to 70, the sensitivity for 500ppm acetone gas is up to 222, and the sensitivity for 10ppm acetone gas is up to 8 or so. The operating temperature is low: the optimum temperature of the ZnO nanosheet composite material modified by the Pd nanoparticles is 340 DEG C, and is greatly lowered as compared with 420 DEG C of the single ZnO nanosheets. The selectivity is high: the gas sensor is less sensitive to some common organic solvents, such as ethanol, methanol, benzene, toluene and the like, than acetone.

Description

technical field [0001] The invention relates to a novel composite nanometer gas sensitive material and a preparation method thereof. Background technique [0002] As an important chemical raw material and industrial solvent, acetone plays an extremely important role in modern chemical industry production. Among them, in 2011, the global demand for acetone reached 6.31 million tons, while my country's acetone consumption has exceeded one-fifth of the world's total. And acetone is also a kind of flammable, explosive, poisonous and highly volatile liquid. It is easy to produce a large amount of acetone vapor during use. It has been reported that acetone vapor with a concentration of more than 500 ppm will cause obvious harm to the human body, and its lower explosion limit is only 2.6%. Therefore, it is of great significance to develop efficient, fast and sensitive acetone sensors. At present, acetone gas-sensing materials are mainly based on ZnO materials, but they have disa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00B82Y30/00
Inventor 李峰肖元化巩飞龙卢灵珍张爱勤韩莉锋曹永博赵继红
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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