Noble metal doped SnO2 composite material and preparation method thereof

A technology of composite materials and precious metals, applied in the direction of material resistance, etc., can solve the problems of unsatisfactory appearance shape and particle size, and greater influence on the gas-sensing characteristics of components, etc., to achieve excellent selectivity, improve sensitivity and response time, and work temperature range wide effect

Inactive Publication Date: 2009-11-04
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] SnO 2 It is the main raw material of the gas sensor, but the currently used SnO 2 The appearance, shape and particle size of the raw materials are not ideal, which has a great impact on the gas-sensing characteristics of the components

Method used

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  • Noble metal doped SnO2 composite material and preparation method thereof

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specific Embodiment approach 1

[0014] Specific embodiment one: the mass fraction of 0.3 parts of Pd and 99.7 parts of SnO 2 Powder mixing; add deionized water with a mass fraction of 20-40%, and stir to form a slurry; evenly coat the slurry on the ceramic substrate and dry it in an oven; put the ceramic substrate in a muffle furnace, Sinter at high temperature for 1 hour, and cool to room temperature with the furnace to obtain SnO doped with noble metal Pd 2 composite material.

specific Embodiment approach 2

[0015] Specific embodiment two: the mass parts of 0.05 parts of Au and 99.95 parts of SnO 2 Powder mixing; add deionized water with a mass fraction of 20-40%, and stir to form a slurry; evenly coat the slurry on the ceramic substrate and dry it in an oven; put the ceramic substrate in a muffle furnace, Sintering at high temperature for 1 hour, and cooling to room temperature with the furnace to obtain SnO doped with noble metal Au 2 composite material.

specific Embodiment approach 3

[0016] Specific embodiment three: the mass parts of 0.13 parts of Cu, 0.42 parts of Sb and 99.45 parts of SnO 2 Powder mixing; add deionized water with a mass fraction of 20-40%, and stir to form a slurry; evenly coat the slurry on the ceramic substrate and dry it in an oven; put the ceramic substrate in a muffle furnace, Sintering at high temperature for 1 hour, and cooling to room temperature with the furnace to obtain SnO doped with noble metals Cu and Sb 2 composite material.

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Abstract

The invention provides a noble metal doped SnO2 composite material and a preparation method thereof. The method comprises: (1) SnO2 superfine powder is mixed with noble metal powder with mass fraction ranging from 0.05 to 1.21, deionized water with mass fraction ranging from 20 to 40 percent is added to and stirred with the mixture into slurry, and the noble metal is one of or the mixture of two or more of Pd, Au, Cu and La or Ce; (2) the slurry is evenly coated on a ceramic substrate and is dried in a baking oven; and (3) the ceramic substrate is put into a muffle furnace and is sintered for 1 hour at the temperature from 600 to 700 DEG C, and after the room temperature is realized by furnace cooling, the noble metal doped SnO2 composite material can be obtained. Compared with common SnO2 materials, the noble metals doped in the invention, such as Pd, Au, Cu, La and Ce, and the like, can reduce the activation energy of adsorption of chemical gas, and can obviously improve the sensitivity and the response time of the SnO2 material.

Description

(1) Technical field [0001] The invention relates to a composite material, and the invention also relates to a preparation method of the composite material. Specifically, a noble metal-doped SnO 2 Composite materials and methods for their preparation. (2) Background technology [0002] SnO 2 It is the main raw material of the gas sensor, but the currently used SnO 2 The appearance, shape and particle size of the raw material are not ideal, which greatly affects the gas-sensing characteristics of the element. (3) Contents of the invention [0003] The object of the present invention is to provide a kind of SnO doped noble metal with high sensitivity and short response time 2 composite material. The object of the present invention is also to provide a kind of can improve SnO 2 Material properties of noble metal doped SnO 2 Methods of preparation of composite materials. [0004] The purpose of the present invention is achieved like this: [0005] SnO doped with precio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
Inventor 李灵东马骎乔英杰崔新芳
Owner HARBIN ENG UNIV
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