Olivine structure gas-sensitive material for detecting formaldehyde and preparation method thereof

An olivine structure and gas-sensing material technology, which is applied in the field of olivine-structure gas-sensing materials and their preparation, can solve the problems that the sensitivity, selectivity, long-term stability, rapid response-recovery indoor air detection cannot be fully satisfied, and the like, Achieve the effect of excellent selectivity, low energy consumption, and great application prospects

Active Publication Date: 2021-09-07
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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  • Olivine structure gas-sensitive material for detecting formaldehyde and preparation method thereof
  • Olivine structure gas-sensitive material for detecting formaldehyde and preparation method thereof
  • Olivine structure gas-sensitive material for detecting formaldehyde and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0031] (1) Add 5mmol of sodium hydroxide (NaOH) to 5mL of deionized water, and prepare an alkaline solution with a concentration of 1mol / L;

[0032] (2) Weigh 26.2mg germanium oxide (GeO 2 ), added in the alkaline solution of step (1), stirred and dissolved; 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 (2) is added to 5mL deionized water, and the configuration concentration is a cadmium solution of 0.1mol / L;

[0034] (4) Mix the solution of step (2) and step (3), add 50mg surfactant polyethylene oxide-polyoxypropylene-polyoxyethylene triblock copolymer (P123) and stir for 15 minutes ; Transfer the stirred mixed solution to a reaction kettle, and conduct a hydrothermal reaction at 200° C. for 12 hours;

[0035] (5) After the reactor is cooled to room temperature, the reaction solution is centrifuged, an...

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 4 mm and a diameter of 1 mm. At both ends of the outer surface of the ceramic tube, ring-shaped, separate and parallel gold electrodes are distributed. The distance between the two gold electrodes is 1.15mm, and the width of the gold electrodes is 0.5mm. Two platinum wires are connected to each gold electrode. wire. The heating part is a nickel-chromium alloy heating wire, which passes through 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 cadmium germanate nanosheets prepared in Example 1 in an agate mortar, add 10 mL of dehydrated alcohol with a mass fraction of 95%, a...

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Abstract

The invention discloses an olivine structure gas-sensitive material with high sensitivity and excellent selectivity to formaldehyde and a preparation method thereof, and belongs to the technical field of gas-sensitive materials. According to the invention, a germanium source, a silicon source, a cadmium source and a surfactant are used as raw materials, and the gas sensitive material with an olivine structure is prepared by adopting a hydrothermal synthesis method and comprises cadmium germanate, cadmium silicon germanate, cadmium silicate and a compound thereof. Test results show that the material is composed of nanosheets, the thickness of each sheet layer is about 20 nm, and the diameter of each sheet layer is about 200 nm. At a relatively low working temperature (140 DEG C), the material shows very high sensitivity to formaldehyde, has extremely low detection lower limit and quick response recovery capability, and has very small response to other volatile organic compounds (such as acetone, benzene, methylbenzene, dimethylbenzene, nitrobenzene and the like). The preparation method disclosed by the invention is a hydrothermal synthesis method, and the method has the advantages of simple required equipment, mild production conditions, simple process, stable structure of a target material and easiness in batch production and application.

Description

technical field [0001] The invention belongs to the technical field of gas-sensing materials, and in particular relates to an olivine-structured gas-sensing material with high sensitivity and excellent selectivity to formaldehyde and a preparation method thereof. Background technique [0002] A gas sensor is a device used to detect gas concentration and composition, and it plays an extremely important role in environmental protection and safety monitoring. There are many kinds of gas sensors, among which semiconductor gas sensors are the most widely used. 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. Slight indoor formaldehyde concentration exceeding the standard will enhance people's discomfort; severe indoor formaldehyde concentration exceeding the standard will greatly incr...

Claims

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Application Information

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Patent Type & Authority Applications(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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