Preparation of three-dimensional SiO2-Ag porous structure and application of three-dimensional SiO2-Ag porous structure in detection of volatile organic compounds

A volatile organic compound, porous structure technology, applied in measurement devices, material excitation analysis, instruments, etc., can solve the problems of easy disintegration, troublesome preparation of MOFs structure, difficult use and storage of substrates, etc.

Active Publication Date: 2020-05-22
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method of the MOFs structure is cumbersome, and the prepared MOFs structure is unstable and easy to disintegrate, which brings great difficulties to the use and storage of the substrate.

Method used

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  • Preparation of three-dimensional SiO2-Ag porous structure and application of three-dimensional SiO2-Ag porous structure in detection of volatile organic compounds
  • Preparation of three-dimensional SiO2-Ag porous structure and application of three-dimensional SiO2-Ag porous structure in detection of volatile organic compounds
  • Preparation of three-dimensional SiO2-Ag porous structure and application of three-dimensional SiO2-Ag porous structure in detection of volatile organic compounds

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Experimental program
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Effect test

preparation example Construction

[0067] Preparation of atmospheres with different concentrations: According to Raoult's law, the partial pressure of the components in the ideal mixture is related to the mole fraction of the components in the solution. In this experiment, n-decane with a small vapor pressure is used as an irrelevant component to prepare the mixture Liquid, by calculating the vapor pressure of the target gas in the mixture with n-decane as solvent, and then calculate its gas concentration. By changing the molar ratio of n-decane / pure target gas solution, different concentrations of target gas atmospheres can be obtained.

[0068] Raman measurement of VOCs vapor: Before Raman measurement, first cut the aged substrate into a 4mm×4mm solid as the Raman active matrix. Add 2ml of the prepared mixed solution to the liquid pool in the closed Raman cell. After the target gas volatilizes and reaches saturation, quickly put the cut substrate into the closed Raman cell, and take it out after a period of a...

Embodiment 1

[0070] 1. Synthesis of silica sol

[0071] The method for preparing silica sol is sol-gel method. Silica microspheres with a diameter of about 10 nm were prepared by hydrolyzing tetraethyl silicate by an acid-catalyzed method. First mix tetraethyl orthosilicate, absolute ethanol and water with a volume ratio of 2.2:1.655:0.25 evenly, then add 0.118ml of hydrochloric acid solution with a concentration of 0.036M during the stirring process, and stir thoroughly for 60 minutes to obtain a colorless and transparent The oily liquid is silica sol.

[0072] 2. Preparation of Ag-NPs

[0073] First prepare silver ammonia solution, dissolve silver nitrate in deionized water under vigorous stirring, then add ammonia solution dropwise to it to make 0.1M silver ammonia solution; mix 0.017g sodium citrate, 0.2175g PVP and 0.055g glucose Dissolve in 50mL deionized water, stir and heat to 100°C, add 4.5mL silver ammonia solution dropwise within 2min, keep the mixed solution at 100°C for 30 ...

Embodiment 2

[0077] by adding to SiO 2 Different volumes of AgNPs solutions were added to the sol to adjust the SiO 2 -The content of silver nanoparticles in the Ag sol, so as to obtain SiO with different doping amounts 2 -Ag three-dimensional porous structure matrix. The detection results showed that the addition of 70 μL AgNPs solution of SiO 2 -Ag substrate has the best SERS enhancement effect ( Figure 7 a), is SiO 2 3.6 times the base ( Figure 6 ). When gas molecules are in contact with or close to silver nanoparticles, the electromagnetic enhancement mechanism (EM) and chemical enhancement mechanism (CE) of silver nanoparticles will increase the intensity of the incident field and the intensity of the scattered field, thus improving the detection sensitivity of gas molecules. The doping amount of silver nanoparticles will affect the response of the substrate to target gas molecules. When the doping amount is small, because the distance between the silver nanoparticles is too ...

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Abstract

The invention discloses preparation of a three-dimensional SiO2-Ag porous structure and application of the three-dimensional SiO2-Ag porous structure in detection of volatile organic compounds. The preparation method comprises the following steps: firstly, preparing a SiO2 gas adsorption carrier with high specific surface area and high porosity through an acid-base two-step catalysis method, and then doping silver nanoparticles with a certain size into silicon dioxide to prepare the three-dimensional SiO2-Ag porous structure material. The structure has a large surface area; the porosity is high; high-concentration silicon hydroxyl (Si-OH) on the surface is realized; under the dual effects of physical adsorption and chemical bonding, the substrate has good gas adsorption and capture effects, can be used as a substrate material for enhancing Raman spectra for detection of volatile organic compounds, has excellent signal reproducibility and good stability, and has great application potential in field detection.

Description

technical field [0001] The invention relates to a three-dimensional SiO 2 - Preparation of Ag porous structure and its application in the detection of volatile organic compounds. Background technique [0002] With the development of modern industry, people's daily life is filled with more and more industrial products, which release volatile organic compound (VOCs) gas in the indoor air. When the concentration of most VOCs reaches a certain level, it will pose a threat to human health. For example, acetone can irritate the throat, nose and eyes. Long-term exposure to acetone can lead to diseases such as pharyngitis, bronchitis and dermatitis. In addition, toluene is irritating to the skin and mucous membranes. High concentrations of toluene can cause nervousness, restlessness, and rapid heartbeat. Toluene can also cause damage to the liver or kidneys. Chloroform also has certain toxicity, which not only has great harm to the central nervous system of the human body, but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658Y02A50/20
Inventor 张茂峰刘雍凯李皓玥王雅茹
Owner HEFEI UNIV OF TECH
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