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Preparation method for nano precious metal particle modified tin dioxide gas sensitive material

A technology of tin dioxide and gas-sensitive materials, applied in metal material coating technology, ion implantation plating, coating, etc., can solve the problems of shortening the preparation stage and increasing the scope of use, so as to achieve simple production process and prevent harmful Gas poisoning, the effect of preparing noble metal particle size controllable

Inactive Publication Date: 2013-03-06
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0004] The present invention aims at the relevant deficiencies of the current gas-sensing materials, and adopts the reaction synthesis method to develop a new generation of high-efficiency gas-sensing materials with nanometer noble metal particles. Pollution problems of other toxic substances, and to a certain extent, improve the sensitive characteristics of harmful gases, and the preparation process is simple, which shortens the preparation stage of material preparation, reduces process complexity and production costs, and makes the use of this type of material greatly increase

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  • Preparation method for nano precious metal particle modified tin dioxide gas sensitive material

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Effect test

Embodiment 1

[0040] According to 0.3% platinum powder (weight percent), 0.2% rhodium powder (weight percent), add an appropriate amount of lanthanum-tin alloy powder, and the balance is aluminum powder. After mixing for 1 hour, put it into a ball mill jar of corundum material, Vacuumize, fill with argon, and carry out mechanical alloying under the protective atmosphere of argon. The rotation speed of the planetary high-energy ball mill is 800rad / min, the ball milling time is 10 hours, and the ball milling temperature is 200K; it is bidirectionally pressed in a steel mold to form a green body, and the green body forming pressure is 650MPa; it is put into a reaction synthesis furnace for sintering, and the reaction synthesis temperature is 1200K. The reaction synthesis oxygen atmosphere concentration is relatively high, and the reaction synthesis time is 2 hours. Using a glass substrate, vacuumize, the vacuum degree is about 10 -5 -10 -2 Pa, sputtering or deposition rate is 10 -2 g / s, the...

Embodiment 2

[0042] According to 0.1% platinum powder (weight percent), 0.1% rhodium powder (weight percent), 0.2% palladium powder (weight percent), add an appropriate amount of cerium aluminum alloy powder, and the balance is tin powder, after 1 hour mixing , placed in a corundum ball mill jar, vacuumed, filled with argon, and mechanically alloyed under an argon protective atmosphere. The rotation speed of the planetary high-energy ball mill is 1000rad / min, the ball milling time is 30 hours, and the ball milling temperature is 220K; it is bidirectionally pressed in a steel mold to form a green body, and the green body forming pressure is 450MPa; it is put into a reaction synthesis furnace for sintering, and the reaction synthesis temperature is 1300K. The reaction synthesis oxygen atmosphere concentration is relatively high, and the reaction synthesis time is 3 hours. Sputtering deposition is carried out for about 45 minutes, and a tin dioxide film with a thickness of about 30 microns is...

Embodiment 3

[0044] By 0.02% platinum powder (percentage by weight), 0.1% rhodium powder (percentage by weight), 0.2% palladium powder (percentage by weight), 3% silver powder (percentage by weight), add an appropriate amount of tin-cerium alloy powder, the balance It is tin powder. After mixing for 1 hour, put it into a ball mill jar made of corundum material, vacuumize it, fill it with argon gas, and carry out mechanical alloying under the protective atmosphere of argon gas. Planetary high-energy ball mill speed 1200rad / min, ball milling time 60 hours, ball milling temperature 220K; cold isostatic pressing forming: 200-400MPa; press forming into green body; put into reaction synthesis furnace for sintering, reaction synthesis temperature 1400K, reaction synthesis The concentration of oxygen atmosphere is relatively high, and the reaction synthesis time is 2 hours. Sputtering deposition is carried out for about 30 minutes, and a tin dioxide film with a thickness of about 20 microns is obt...

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Abstract

The invention discloses a preparation method for a novel nano precious metal particle modified tin dioxide gas sensitive material. The preparation method for the nano precious metal particle modified tin dioxide gas sensitive material comprises the following steps of: adding a small quantity of other elements serving as performance tuning elements into raw materials of precious metal powder (two or more types of Ag, Au, Pt, Ru, Rh, Pd, Ir and Re), tin powder or alloy powder of the precious metals and tin, wherein the mass fraction ratio of the precious metals to the tin is controlled to be between 2 and 10 percent; performing mechanical alloying in a low-temperature ball mill, wherein the prepared precious metals are enwrapped by the tin powder, and formed nano-clusters are uniformly distributed in powder; pressing the prepared compound powder; performing oxygen atmosphere sintering at a certain temperature; and finishing reactive synthesis of oxides by controlling the process condition. The prepared precious metals are distributed in a tin dioxide target material in the form of nano particles, and the previous metal nano particles prepared by sputtering or depositing are uniformly distributed on a tin dioxide gas sensitive thin film. The novel gas sensitive material prepared by the method has high gas sensitive comprehensive performance, low cost, wide detection of harmful gases and long service life.

Description

technical field [0001] The invention relates to the field of functional material science, in particular to a reaction synthesis technique for preparing tin dioxide gas-sensing materials modified by nanometer precious metal particles. Background technique [0002] Main features of known tin dioxide gas sensitive materials: tin dioxide (SnO 2 ) materials have a series of excellent gas-sensing properties and physical and chemical properties. Various gas sensors can be obtained through different doping modifications, which are suitable for the detection of trace and low-concentration gases. They have adjustable, conductive properties, high thermal stability and chemical stability. Sex and other advantages, such as H 2 , H 2 S, NO x , CO et al. The superiority of tin dioxide as a sensitive material has been widely recognized, making it one of the most studied metal oxide sensitive materials. The electronic effect of noble metals is particularly significant for the improvemen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/06
Inventor 陈敬超周晓龙于杰杜焰冯晶阮进
Owner KUNMING UNIV OF SCI & TECH
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