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A kind of tin oxide-iron oxide nanocomposite particles modified by platinum particles and its preparation method and application

A nano-composite particle and iron oxide nanotechnology, applied in the field of gas-sensing sensing materials, can solve the problems of expensive styrene gas detection equipment, complicated operation process, undeveloped metal oxide resistance gas sensor, etc., and achieve good gas Sensitivity, simple operation, low cost effect

Active Publication Date: 2020-12-15
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of expensive styrene gas detection equipment and complicated operation process in the prior art, and no metal oxide resistance gas sensor capable of detecting styrene gas has been developed, the invention provides a platinum particle modified The tin oxide-iron oxide nanocomposite particle and its preparation method and application; the tin oxide-iron oxide nanocomposite particle modified by platinum particles has good gas sensitivity, and can be used as a sensing layer to realize high-sensitivity tracking of styrene gas Quantitative detection, and low cost of use, no need for expensive detection equipment, simple operation, fast and efficient

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  • A kind of tin oxide-iron oxide nanocomposite particles modified by platinum particles and its preparation method and application
  • A kind of tin oxide-iron oxide nanocomposite particles modified by platinum particles and its preparation method and application
  • A kind of tin oxide-iron oxide nanocomposite particles modified by platinum particles and its preparation method and application

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preparation example Construction

[0027] A tin oxide-iron oxide nanocomposite particle modified by platinum particles, the preparation method of which may comprise the following steps:

[0028] Step A, disperse the tin oxide-iron oxyhydroxide nanocomposite particles in the ethanol-acetonitrile mixed solution, make the concentration of the tin oxide-iron oxyhydroxide nanocomposite particles in the mixed solution be 0.1-1.5mg / mL, and stir magnetically for 10-30min , then sequentially add ammonia water and 3-aminopropyltriethoxysilane, and magnetically stir at 20-100°C for 10-48 hours, and then perform solid-liquid separation and washing to obtain amino-modified tin oxide-iron oxyhydroxide nanocomposite particles. Wherein, the volume ratio of ethanol to acetonitrile in the ethanol-acetonitrile mixture is 1:0.5-10; the amount of ammonia water is 0.01-0.2 times the total mass of the tin oxide-iron oxyhydroxide nanocomposite particles; the The dosage of 3-aminopropyltriethoxysilane is 0.01-0.25 times of the total m...

Embodiment 1

[0042] A tin oxide-iron oxide nanocomposite particle modified by platinum particles, the preparation method of which may comprise the following steps:

[0043] Step a1, according to the weight ratio of tin tetrachloride pentahydrate: aqueous ethanol solution: hydrochloric acid solution with a concentration of 35 to 40 wt% = 0.5 to 2:50 to 150:1, add tin tetrachloride pentahydrate to the aqueous ethanol solution and stir for 20 min , and then add a hydrochloric acid solution with a concentration of 35-40 wt%, and place it at 200° C. for a closed reaction for 12 hours, and then perform solid-liquid separation and washing treatment, thereby obtaining tin oxide hollow spheres.

[0044] Step b1, disperse 50 mg of the tin oxide hollow spheres into 50 mL of deionized water, and stir magnetically for 10 min to obtain a tin oxide dispersion; add ferric chloride to the tin oxide dispersion, and control its concentration to 0.8 mg / mL, magnetically stirred for 30 minutes to obtain a mixe...

Embodiment 2

[0054] A tin oxide-iron oxide nanocomposite particle modified by platinum particles, the preparation method of which may comprise the following steps:

[0055] Step a2, according to the weight ratio of tin tetrachloride pentahydrate: ethanol aqueous solution: 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 , and then add a hydrochloric acid solution with a concentration of 35-40 wt%, and place it at 200° C. for a closed reaction for 10 hours, and then carry out solid-liquid separation and washing treatment, thereby obtaining tin oxide hollow spheres.

[0056]Step b2, disperse 50 mg of the tin oxide hollow spheres into 50 mL of deionized water, and stir magnetically for 10 minutes to obtain a tin oxide dispersion; add ferric chloride to the tin oxide dispersion, and control its concentration to 0.8 mg / mL, magnetically stirred for 30 minutes to obtain a mixed di...

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Abstract

The invention discloses platinum particle modified tin oxide-iron oxide composite nanoparticles as well as a preparation method and an application of the composite nanoparticles. The surfaces of tin oxide-hydroxyl iron oxide composite nanoparticles are modified with 3-aminopropyl triethoxysilane, platinum particles with ultrasmall sizes are supported on the surfaces of the oxide-hydroxyl iron oxide composite nanoparticles through the in-situ reduction process, finally, high-temperature calcination is performed under protection of inert gas, and the platinum particle modified tin oxide-iron oxide composite nanoparticles are obtained. The platinum particle modified tin oxide-iron oxide composite nanoparticles can serve as a sensing material in a gas sensor and is used for high-sensitivity trace detection of styrene gas. The composite nanoparticles have good gas sensitivity, can monitor styrene gas as a gas-sensitive sensing layer, are low in use cost, do not require expensive detection devices and are simple, rapid and efficient to operate.

Description

technical field [0001] The invention relates to the field of gas-sensing sensing materials, in particular to a platinum particle-modified tin oxide-iron oxide nanocomposite particle and a preparation method and application thereof. Background technique [0002] Styrene is a chronic toxic gas, which is seriously harmful to the human nervous system and respiratory system, and long-term exposure may cause leukemia and cancer. According to the "Odor Pollutant Emission Standard" (GB14554-93), the minimum critical value of the concentration of styrene gas emitted into the atmosphere cannot exceed 0.6ppm, so trace amounts of styrene must be detected. [0003] At present, the technologies used to detect styrene gas mainly include gas chromatography-mass spectrometry, laser detection method, surface acoustic wave sensing technology and piezoelectric optical sensor; however, these detection technologies have the disadvantages of expensive detection equipment and complicated operation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 段国韬刘波李圆圆高磊
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI