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An olive structure and preparation method for detecting formaldehyde

A technology of olivine structure and gas-sensing materials, which is applied in the field of olivine-structure gas-sensing materials and its preparation, can solve the problems that cannot fully meet the sensitivity, selectivity, long-term stability, rapid response-recovery indoor air detection, etc. Achieve excellent selectivity, low preparation cost and simple operation

Active Publication Date: 2022-06-28
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these materials generally have more or less problems, and cannot fully meet the index requirements for indoor air detection such as sensitivity, selectivity, long-term stability, and rapid response-recovery.

Method used

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  • An olive structure and preparation method for detecting formaldehyde
  • An olive structure and preparation method for detecting formaldehyde
  • An olive structure and preparation method for detecting formaldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Preparation of an olivine structure gas sensing material

[0031] (1) 5mmol of sodium hydroxide (NaOH) is added to 5mL of deionized water, and the configuration concentration is an alkaline solution of 1mol / L;

[0032] (2) Weigh 26.2 mg of germanium oxide (GeO 2 ), added to the alkaline solution of step (1), stirring and dissolving; the molar concentration of germanium solution is 0.05mol / L;

[0033] (3) Weigh 114.2 mg cadmium chloride 2.5 hydrate (CdCl 2 ·2.5H 2 0), added to 5mL of deionized water, the configuration concentration is 0.1mol / L cadmium solution;

[0034] (4) Mix the solutions of step (2) and step (3), add 50 mg of surfactant polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123), and stir for 15 minutes ; The mixed solution after stirring was transferred to the reactor, and the hydrothermal reaction was carried out at 200 ° C for 12 hours;

[0035] (5) After the reaction kettle is cooled to room temperature, th...

Embodiment 2

[0036]Example 2: Fabrication and gas-sensing properties of gas-sensing devices based on cadmium germanate nanosheets

[0037] The gas sensor is mainly composed of alumina ceramic tube, nickel-chromium alloy heating wire and base. The alumina ceramic tube has a length of 4mm and a diameter of 1mm. Ring-shaped, separate and parallel gold electrodes are distributed on both ends of the outer surface of the ceramic tube. The distance between the two gold electrodes is 1.15mm, the width of the gold electrodes is 0.5mm, and two platinum wires are connected to each gold electrode. wire. The heating part is a nickel-chromium alloy heating wire, which passes through the inside of the alumina ceramic tube, and its function is to provide a stable working temperature for the gas sensor.

[0038] The preparation steps of the gas sensor are as follows: (1) Put 50 mg of the cadmium germanate nanosheets prepared in Example 1 in an agate mortar, add 10 mL of 95% absolute ethanol by mass, and ...

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Abstract

The invention discloses an olivine structure gas-sensing material with high sensitivity and excellent selectivity to formaldehyde and a preparation method thereof, belonging to the technical field of gas-sensing materials. The invention uses germanium source, silicon source, cadmium source and surfactant as raw materials, and adopts hydrothermal synthesis method to prepare gas sensitive material with olivine structure, including cadmium germanate, cadmium silicon germanate, cadmium silicate and their composite thing. The test results show that the material is composed of nanosheets with a thickness of about 20nm and a diameter of about 200nm. At a lower working temperature (140°C), the material exhibits high sensitivity to formaldehyde, and has an extremely low detection limit and fast response recovery ability. xylene, nitrobenzene, etc.) have little response. The preparation method of the invention is a hydrothermal synthesis method, which requires simple equipment, mild production conditions, simple process, stable structure of the target material, and easy batch production and application.

Description

technical field [0001] The invention belongs to the technical field of gas sensitive materials, and in particular relates to an olivine structure gas sensitive material with high sensitivity and excellent selectivity to formaldehyde and a preparation method thereof. Background technique [0002] Gas sensor is a device used to detect gas concentration and composition, which plays an extremely important role in environmental protection and safety monitoring. There are many kinds of gas sensors, of which the most widely used is the semiconductor gas sensor. This is because the semiconductor gas sensor has the advantages of high sensitivity, fast response, long service life and low cost. [0003] Formaldehyde is one of the main indoor gaseous pollutants, which is extremely harmful to the human body. Mild indoor formaldehyde concentration exceeding the standard will increase people's discomfort; severe indoor formaldehyde concentration exceeding the standard will greatly increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/126G01N27/127
Inventor 李国栋李佳玉邹晓新
Owner JILIN UNIV
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