Gold/palladium alloy particle modified tin oxide composite material and preparation method and application thereof

A composite material and tin oxide technology, applied in the field of gas-sensitive sensing materials, can solve the problems of long detection time, expensive equipment, complicated operation process, etc., and achieve the effects of low cost of use, good gas sensitivity, and simple operation

Active Publication Date: 2019-05-03
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of expensive equipment for detection of dimethyl disulfide gas in the prior art, complex operation process, long detection time, inability to perform on-site and real-time detection, and the inability of existing resistive metal oxide gas sensors to detect dimethyl disulfide To solve technical problems such as high-selectivity detection of ether gas, the invention provides a tin oxide composite material modified by gold / palladium alloy particles and its preparation method and application. It not only has good gas sensitivity, but also can be used as a resistive metal oxide The sensing layer of the gas sensor realizes ultra-high selectivity detection of dimethyl disulfide gas, and does not require expensive detection equipment, low detection cost, simple operation, fast and efficient

Method used

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  • Gold/palladium alloy particle modified tin oxide composite material and preparation method and application thereof
  • Gold/palladium alloy particle modified tin oxide composite material and preparation method and application thereof
  • Gold/palladium alloy particle modified tin oxide composite material and preparation method and application thereof

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preparation example Construction

[0018] The preparation method comprises steps:

[0019] The preparation method of the tin oxide composite material modified by gold / palladium alloy particles is characterized in that it comprises the steps:

[0020] Step A, according to tin tetrachloride pentahydrate: ethanol: concentration is the weight ratio of the hydrochloric acid solution=0.5~2:50~150:1 of 35~40wt%, adds tin tetrachloride pentahydrate in ethanol aqueous solution and stirs 10~ 30min, then add a hydrochloric acid solution with a concentration of 35-40wt%, and place it at 150-200°C for a closed reaction for 5-24h, then carry out solid-liquid separation and washing, so as to obtain tin oxide hollow spheres;

[0021] Step B. Disperse tin oxide into the ethanol / toluene mixture so that the concentration of tin oxide particles in the mixture is 0.1-3mg / mL, stir for 10-30min, and then add ammonia water and 3-aminopropyltriethoxy in sequence Silane, and stirred at 20-100°C for 10-48 hours, and then solid-liquid se...

Embodiment 1

[0036] A preparation method of a tin oxide composite material modified by gold / palladium alloy particles, the preparation method may include:

[0037] Step a1, according to the weight ratio of tin tetrachloride pentahydrate: ethanol: hydrochloric acid solution with a concentration of 35-40wt% = 0.5-2:50-150:1, add tin tetrachloride pentahydrate into the ethanol aqueous solution and stir for 30min, Then add a hydrochloric acid solution with a concentration of 35 to 40 wt%, and place it at 200° C. for closed reaction for 10 hours, and then carry out solid-liquid separation and washing, so as to obtain tin oxide hollow spheres.

[0038] Step b1, disperse 0.2g of tin oxide into 100mL of ethanol / toluene mixture (the volume ratio of ethanol to toluene is 1:2.5), stir magnetically for 30min, then add 3mL of ammonia water and 3mL of 3-aminopropyltriethoxy in sequence base silane, and stirred at 80° C. for 48 h, and then solid-liquid separation and washing were carried out to obtain am...

Embodiment 2

[0044] A preparation method of a tin oxide composite material modified by gold / palladium alloy particles, the preparation method may include:

[0045] Step a2, according to the weight ratio of tin tetrachloride pentahydrate: ethanol: hydrochloric acid solution with a concentration of 35-40wt% = 0.5-2:50-150:1, add tin tetrachloride pentahydrate into the ethanol aqueous solution and stir for 20min, Then add a hydrochloric acid solution with a concentration of 35 to 40 wt%, and place it at 180° C. for closed reaction for 10 hours, and then carry out solid-liquid separation and washing, so as to obtain tin oxide hollow spheres.

[0046] Step b2, disperse 0.3g of tin oxide into 100mL of ethanol / toluene mixture (the volume ratio of ethanol to toluene is 1:3), stir magnetically for 30min, then add 2mL of ammonia water and 3mL of 3-aminopropyltriethoxy in sequence base silane, and stirred at 80° C. for 24 hours, and then subjected to solid-liquid separation and washing to obtain amin...

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Abstract

The invention discloses a gold / palladium alloy particle modified tin oxide composite material and a preparation method and application thereof. Tin oxide particles of hollow structure are prepared ina solvothermal method, gold / palladium alloy particle modified tin oxide composite particles in ultra small size are prepared in an in-situ reduction method, and the gold / palladium alloy particle modified tin oxide composite material is obtained via a gentle return process. The material is highly gas sensitive, can serve as a sensing layer of a resistive type metal oxide gas sensor, and can detectdimethyl disulfide gas with a superhigh selectivity; and expensive detection apparatuses are not needed, the detection cost is low, and operation is simple, rapid and efficient.

Description

technical field [0001] The invention relates to a gas-sensitive sensing material, in particular to a tin oxide composite material modified with gold / palladium alloy particles, a preparation method and application thereof. Background technique [0002] Dimethyl disulfide is a typical volatile sulfur-containing toxic substance, which widely exists in sewage treatment, petroleum refining process and wood pulp industry. It is extremely harmful to humans and animals. After long-term exposure, even at low concentrations, it will cause great damage to the human respiratory and nervous systems. Therefore, there is an urgent need to develop some detection techniques to monitor this toxic gas in real time. Currently, several techniques have been developed, such as gas chromatography / mass spectrometry detection, biosensing detection, electrochemical detection and optical detection. However, these technologies have many disadvantages, namely high cost, high power consumption, complica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12B22F9/24B22F1/00B82Y40/00
Inventor 段国韬刘波罗媛媛李科高磊
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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