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Preparation method for Pd-Cu-Clx/TiO2 gas-sensitive material

A pd-cu-clx, gas-sensitive material technology, applied in the direction of material resistance, nanotechnology, etc., can solve the problem of poor selectivity of simple oxide nanomaterials, and achieve the effect of convenient preparation, simple preparation process and good repeatability

Inactive Publication Date: 2015-04-22
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a simple and feasible method for preparing gas sensor materials with good selectivity, solve the problem of poor selectivity of simple oxide nanomaterials, and make gas sensor based on metal oxides have better Selectivity, higher sensitivity

Method used

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  • Preparation method for Pd-Cu-Clx/TiO2 gas-sensitive material
  • Preparation method for Pd-Cu-Clx/TiO2 gas-sensitive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix 2 ml of ammonia water and 8 ml of water, weigh 0.17 g of palladium chloride and 0.033 g of copper chloride in the above solution, ultrasonicate for half an hour, weigh 1 g of commercial titanium oxide particles and stir for half an hour, then Sonicate for 1 hour, centrifuge, and anneal the resulting powder at 300 degrees for 4 hours.

[0019] figure 1 is Pd-Cu-Cl x / TiO 2 The energy spectrum of the composite material, it can be seen from the energy spectrum that there are Pd, Cu and Cl in the product, and Pd-Cu-Cl x The mass content is 2.92%, which is equivalent to the feed ratio; figure 2 Yes sample at 300 o The gas sensitivity response curve of CO measured at C, the CO concentration is 50 ppm. This lays the foundation for the application of metal oxides with high selectivity and high sensitivity in gas sensors.

Embodiment 2

[0021] Mix 7 ml of ammonia water and 7 ml of water, weigh 0.1 g of palladium chloride and 0.01 g of copper chloride in the above solution, ultrasonicate for half an hour, weigh 1 g of commercial titanium oxide particles and stir for half an hour, then Sonicate for 1 hour, centrifuge, and anneal the resulting powder at 300 degrees for 4 hours.

Embodiment 3

[0023] Take 20 ml of ammonia water, weigh 0.3 g of palladium chloride and 0.033 g of copper chloride and put them in the above solution, sonicate for half an hour, weigh 1 g of commercial titanium oxide particles and stir for half an hour, then sonicate for 1 hour, centrifuge , annealing the resulting powder at 400°C for 4 hours.

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Abstract

The invention discloses a preparation method for a Pd-Cu-Clx / TiO2 gas-sensitive material. According to the preparation method, commercial titanium oxide is used as a supporting template, and Pd-Cu-Clx decorated TiO2 nanometer particles are obtained with a dipping method; under the weak base condition, absolute ethyl alcohol or water is used as a solvent, and Pd-Cu-Clx modified TiO2 nanometer particles are obtained with a supersaturation dipping technology at room temperature; the ratio of PdCl2 to CuCl2 to TiO2 is regulated by controlling the ratio of Pd salt to Cu salt to TiO2 nano-particles in a precursor; sediments are dried and annealed, and then the Pd-Cu-Clx / TiO2 gas-sensitive material with a high specific surface area and a high degree of crystallinity is obtained. The preparation method of the Pd-Cu-Clx / TiO2 gas-sensitive material is simple, cost is low, the specific surface area is high, and the Pd-Cu-Clx / TiO2 gas-sensitive material can be applied to the gas sensor field. The preparation method of the composite nano-particles is simple, the ratio of PdCl2 to CuCl2 to TiO2 is easy to control, and the obtained nano-particles have the advantages of being even in particle size distribution, high in stability and the like.

Description

technical field [0001] The present invention relates to metal oxide surface modification technology, specifically refers to a Pd-Cu-Cl x Modified TiO 2 Preparation method of nanoparticles. Background technique [0002] At present, gas sensors based on metal oxides have become one of the largest and most widely used sensors in the world due to their advantages such as fast response time and recovery time and low price. When metal oxide semiconductor materials are in contact with gases, physical properties such as electrical conductivity and surface potential, which are characterized by carrier movement, change. Using this property, the composition and concentration of the gas to be measured can be detected, but the gas sensor based on metal oxides The poor selectivity of the sensor severely restricts the development of gas sensors in practical applications. [0003] As a semiconductor functional material, its gas sensitivity is mainly determined by its own crystal structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12B82Y35/00B82Y40/00
Inventor 何丹农葛美英尹桂林
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH