Nanowire cluster WO3-W18O49 heterojunction membrane sensitive to ammonia gas

A technology of WO3-W18O49 and nanowires, which is applied in the field of gas sensors, can solve problems such as pollution and cumbersome steps, and achieve the effects of good repeatability, simple preparation, and low cost of raw materials

Inactive Publication Date: 2018-03-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Usually, the first component needs to be synthesized first, and then mixed with the second component, or the precursors of the two co

Method used

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  • Nanowire cluster WO3-W18O49 heterojunction membrane sensitive to ammonia gas
  • Nanowire cluster WO3-W18O49 heterojunction membrane sensitive to ammonia gas
  • Nanowire cluster WO3-W18O49 heterojunction membrane sensitive to ammonia gas

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Embodiment 1

[0018] Embodiment 1, 0.297 gram of WCl 6 Dissolve in 50 mL of isopropanol and continue stirring at room temperature for 30 minutes. Then the above solution was poured into a stainless steel reaction kettle for hydrothermal reaction, the hydrothermal condition was 200° C. for 24 hours. The hydrothermal reaction product was cooled at room temperature, and then centrifuged and washed three times with deionized water and absolute ethanol, and the centrifuged sample was dried in a vacuum oven at 60°C to obtain WO 3 -W 18 o 49 powder. Dissolve 0.05 g of the powder in 2 ml of methanol solvent and perform ultrasonication for 2 hours, then use a suspension coater to suspend the solution onto a ceramic sheet printed with a platinum electrode, and place it in a muffle furnace after the film is completely dry For 2 hours, the temperature in the furnace was set to 100 ° C, and finally the test substrate was obtained. The preparation flow chart of the thin film device is as follows fig...

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Abstract

The invention provides a preparation method useful for detecting a nanowire cluster WO3-W18O49 heterojunction membrane of NH3, and belongs to the technical field of gas sensitive sensors. Tungsten hexachloride is mixed with isopropyl alcohol; nanowire cluster WO3-W18O49 heterojunction powder is prepared with a solvothermal method, is prepared into a membrane device through a suspension-coating method; and then a gas-sensitive test is performed. in a test temperature range (100 to 300 DEG C), a response value of a sample to 500ppm NH3 at the temperature of 250 DEG C is up to 23.3, and response/recovery time is 13s/49s; moreover, the nanowire cluster WO3-W18O49 heterojunction membrane can be used for detecting NH3 (2 to 1000ppm) with a concentration in a large range, and has high selectivityand stability specific to NH3. The sensor membrane has the advantages of simple preparation method, low raw material cost, superior material membrane performance, high repeatability, and good application value and prospect.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, in particular to a nanowire cluster WO 3 -W 18 o 49 Preparation of heterojunction thin films and their gas-sensing properties to ammonia. Background technique [0002] In recent years, tungsten oxide materials (WO x-3 ) has gradually received widespread attention. in WO x-3 In the material, oxygen vacancies are shallow donors, which can effectively improve the electrical conductivity and donor density of the material, and enhance the material’s ability to react to gases (such as NH 3 , CO 2 , NO 2 ) adsorption, therefore, WO x-3 The material has an attractive prospect in the field of gas detection. W 18 o 49 (WO 2.72 ) is a more representative WO x-3 material, due to W 18 o 49 The forbidden band width is narrow, on the other hand W 18 o 49 is WO x-3 Material (WO 2.625 -WO 3 ) in a material with the highest content of oxygen defects, these properties make W 18 o 49 Materi...

Claims

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Application Information

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IPC IPC(8): G01N27/12C01G41/02
CPCG01N27/127C01G41/02
Inventor 薛庆忠熊雅朱纵野郭天超李晖
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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