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High-sensitivity low-operation-temperature formaldehyde gas sensitive material and preparation method and application thereof

A working temperature, high sensitivity technology, applied in the field of materials, can solve the problems of low sensitivity, high working temperature, poor selectivity, etc., to achieve the effect of good selectivity and fast response-recovery time

Inactive Publication Date: 2016-12-07
YUNNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ying Wang et al. (Ying Wang, Dingsheng Jiang, Wei Wei, Linghui Zhu, Jingran Zhou, Dongming Sun, Applications for rapid formaldehydenanoreactor with hierarchical and spherical structure, Sens Actuators, B 2016, 227, 475-481.) Prepared Cu@SnO by solvothermal method 2 Spherical nano-reactor, the best working temperature for detecting formaldehyde is 230°C, and the sensitivity to 200 ppm formaldehyde at this temperature is 81, while for C 2 h 2 The sensitivity of other gases is below 25, the selection has been improved, but the working temperature is too high
[0005] In a nutshell, the current formaldehyde gas sensor still has problems such as high working temperature (generally 190-350°C), poor selectivity or low sensitivity, making it difficult to be practical

Method used

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  • High-sensitivity low-operation-temperature formaldehyde gas sensitive material and preparation method and application thereof

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preparation example Construction

[0034] The preparation method of the formaldehyde gas-sensitive material with high sensitivity and low working temperature of the present invention comprises the following steps:

[0035] A. Weigh the raw material Ag-LaFeO according to the formula ratio 3 and modified carbon material, after mixing and grinding, add deionized water with a solid-liquid volume ratio of 1:1~3 to obtain solution a;

[0036] B. Vibrate solution a by ultrasonic waves, introduce it into a microwave reaction device, react at normal pressure and temperature 40-90°C for 0.5-10 hours, dry to a moisture content of 2-7%, and grind to obtain the target product.

[0037] The particle size of grinding in step A is 40~100nm.

[0038] The frequency of ultrasonic oscillation in step B is 10k~40k Hz.

[0039] The time of ultrasonic oscillation is 30~90min.

[0040] The drying in step B is to dry at 50-250°C for 1-2 days.

[0041] The particle size of grinding in step B is 40~100nm.

[0042] The application of...

Embodiment 1

[0045] The raw material composition is Ag-LaFeO 3 , The mass ratio of carbon nanotubes to the raw material components is 1:0.03;

[0046] Weighing Ag-LaFeO 3 Mix 1.0000g with 0.0030g of carbon nanotubes evenly, add 30mL of deionized water, oscillate ultrasonically for 45min, then introduce microwave reaction for 2h and dry at 80°C to obtain carbon nanotube modified Ag-LaFeO 3 .

Embodiment 2

[0048] The raw material composition is Ag-LaFeO 3 , The mass ratio of graphene to the raw material composition is 1:0.07;

[0049] Weighing Ag-LaFeO 3 Mix 1.0000g with 0.007g graphene evenly, add 40mL deionized water, oscillate ultrasonically for 60min, then introduce microwave reaction for 2h and dry at 80°C to obtain graphene-modified Ag-LaFeO 3 .

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Abstract

The invention discloses a high-sensitivity low-operation-temperature formaldehyde gas sensitive material and a preparation method and application thereof. The high-sensitivity low-operation-temperature formaldehyde gas sensitive material is prepared from Ag-LaFeO3 and a modified carbon material in a mole ratio of 1:(0.01-0.5) by steps of raw material weighing, mixing, grinding, ultrasonic vibrating, microwave synthesizing, drying and the like. The application refers to application of the high-sensitivity low-operation-temperature formaldehyde gas sensitive material to preparation of formaldehyde gas sensors. By providing of raw materials and ratios for preparation of different carbon material modified Ag-LaFeO3, a method for preparing different carbon material modified Ag-LaFeO3 formaldehyde gas sensitive materials is provided on the basis of the provided raw materials and ratios to obtain a lanthanum ferrite based formaldehyde gas sensitive material high in sensitivity and selectivity and low in operation temperature.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a formaldehyde gas-sensitive material with high sensitivity and low working temperature, a preparation method and application thereof. Background technique [0002] In recent years, with the rapid development of my country's economy, especially the improvement of living standards, and the resulting rapid development of the interior decoration industry, the pollution caused by building materials and decoration has become the main source of indoor environmental pollution. In addition, in order to save energy, the building structure usually has a good airtight function, which aggravates the deterioration of indoor air quality. At present, among the four major pollutions of indoor formaldehyde, benzene and benzene series, ammonia and radioactivity, formaldehyde pollution is the most harmful and most difficult to cure. Formaldehyde pollution mainly comes from various de...

Claims

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Application Information

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IPC IPC(8): G01N33/00
CPCG01N33/0047
Inventor 张裕敏柳清菊张瑾朱忠其
Owner YUNNAN UNIV