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Preparation method of n-nonanal volatile gas sensitive material

A gas-sensitive material and volatile gas technology, which is applied in the analysis of materials, material resistance, material analysis by electromagnetic means, etc., can solve the problem of low detection sensitivity, and achieve the effect of improving detection sensitivity and specific surface area.

Pending Publication Date: 2021-07-27
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the weak points in the prior art, provide a kind of preparation method of n-nonanal volatile gas sensitive material, solve the technical problem that detection sensitivity is not high in the prior art, use the present invention can significantly Improve detection sensitivity

Method used

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  • Preparation method of n-nonanal volatile gas sensitive material

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preparation example Construction

[0023] A method for preparing a nikanone volatile gas sensitive material, including the following steps:

[0024] (1) Put WCL 6 Soluble in methanol solvent, weigh RUCL 3 , Put RUCL 3 Add to the mixed solvent while stirring;

[0025] (2) Transfer the mixed solution to the high pressure reaction kettle, sealed, naturally cooled, centrifuged, washed, dried to obtain a precursor;

[0026] (3) Precursing the precursor in an inert atmosphere to obtain the gas sensitive material;

[0027] (4) The obtained gas sensitive material was added to the deionized water grinding to form a paste, and then the paste was evenly applied to the outer surface of the gas sensor substrate and completely covered with the gold electrode, and naturally drying and formed a gas-sensitive coating at room temperature. Gas sensitive components.

[0028] Step (1), WCL 6 And the molar ratio of the methanol solvent is 1: 1, WCL 6 RUCL 3 The mass ratio is 60-90: 1; in step (2), the temperature of the sealed reaction ...

Embodiment 1

[0032] (1) Weigh 0.375 g WCL 6 Soluble in 80 mL of methanol solvent, weigh 5 mg rucl 3 Add to the mixed solvent while stirring;

[0033] (2) The mixed solution was moved to a high pressure reaction kettle, and the heat was 160 ° C for 24 h, and the precursor was obtained after centrifugation.

[0034] (3) Put the precursor is placed in an inert atmosphere to heat treatment 2 h at 300 ° C to obtain a gas sensitive material;

[0035] Among them, the prepared gas sensitive material components include WO 3-x And Ru, WO 3-x And the mass percentage of Ru is 99% and 1%, respectively, in this example WO 3-x W 18 O 49 .

[0036] The prepared gas sensitive material was detected, and the transmissive electron microscope was observed, it will be apparent that the microstructure of the gas sensitive material is sea urchin, such as figure 1 Down, pure WO 3-x The average diameter of 700-800 nm, 1 wt% RU doped WO 3-x The average diameter is 600-700 nm, the grain size is significantly reduced; the...

Embodiment 2

[0038] The present embodiment differs from the first embodiment in that the Ag replacement RUCL is used in step (1). 3 , The components of the prepared gas sensitive material include WO 3-x And AG, the mass percentage is 99% and 1%, respectively; pure WO 3-x The specific surface is 17 m2 / g, 1 wt% Ag doped WO 3-x The specific surface is 50 m2 / g; when 1 ppm is oxylgenal aldehyde gas, 1 wt% Ag is doped with WO 3-x The sensitivity reaches 15.6, higher than pure WO 3-x Sensitivity (12.4); 1 WT% AG Doped WO 3-x Response / recovery time is 10 s and 122 s, faster than pure WO 3-x Response / recovery time (12 S / 149 s).

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Abstract

The invention discloses a preparation method of an n-nonanal volatile gas sensitive material in the technical field of gas sensitive materials. The method comprises the following steps: (1) dissolving WCl6 in a methanol solvent, weighing RuCl3, and adding the RuCl3 into a mixed solvent while stirring; (2) transferring the mixed solution into a high-pressure reaction kettle, carrying out sealed reaction, naturally cooling, centrifuging, washing and drying to obtain a precursor; and (3) carrying out heat treatment on the precursor in an inert atmosphere to obtain the gas sensitive material. When the prepared gas sensitive material is used for detecting the volatile gas of the n-nonanal, the detection precision can be improved.

Description

Technical field [0001] The present invention belongs to the field of gas sensitive materials, and more particularly to the preparation method of nikylene volatile gas sensitive materials. Background technique [0002] As one of human staple food, rice is rich in nutrients, is the main source of heat, close to people's lives, and the quality of its quality is directly related to the national planned people's livelihood. The rice will agitate during the storage process, which affects the practicality of rice, where mildew can be controlled by adjusting its own moisture content, while the agonism is accompanied by always, there is no elimination, therefore need to be a rice Test. As the storage time is prolonged, the content of aldehyde volatile substances such as rice aging produced by rice increases. Therefore, the detection of nikanone concentration is of great significance for rice storage quality identification. [0003] The change in nikandehyde concentration can represent its...

Claims

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Application Information

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IPC IPC(8): C01G41/02G01N27/12
CPCC01G41/02G01N27/125C01P2004/04C01P2004/30C01P2004/62Y02A50/20
Inventor 张超徐金勇刘可为
Owner YANGZHOU UNIV
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