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Ferrous selenide/iron oxide nanoparticle heterojunction as well as preparation method and application thereof

A nanoparticle and heterojunction technology, applied in the direction of metal selenide/telluride, iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of high working temperature and long recovery time, and achieve low production cost and small size The effect of uniform and excellent gas sensing performance

Active Publication Date: 2020-06-23
咸阳瞪羚谷新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Chinese invention patent CN108896622A discloses a kind of SnO 2 -Preparation method of ZnO gas-sensitive sensing material, the response of the heterostructure to the target gas is significantly improved, but the recovery time is slightly longer and the working temperature is slightly higher

Method used

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  • Ferrous selenide/iron oxide nanoparticle heterojunction as well as preparation method and application thereof
  • Ferrous selenide/iron oxide nanoparticle heterojunction as well as preparation method and application thereof
  • Ferrous selenide/iron oxide nanoparticle heterojunction as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Prepare the precursor solution

[0037] Add 6mL of oleylamine and 8mL of octadecene into a three-necked flask to obtain a mixed solution, under nitrogen atmosphere, add 0.10g FeCl 2 ·4H 2 O was added to the mixed solution, heated to 120° C., and stirred to be fully dissolved to obtain a precursor solution.

[0038] 2. Preparation of FeSe 2 Nanoparticles

[0039] Dissolve 0.78 g of Se powder in 2 mL of oleylamine, and then add it dropwise to the precursor solution to obtain a reaction solution. The reaction solution was reacted at 150 ° C for 0.5 h, and then centrifuged for cleaning (1 time with acetone and 3 with ethanol). The precipitate was collected and dried at 60 °C for 12 h in a vacuum drying oven to obtain FeSe 2 Nanoparticle powder.

[0040] 3. Preparation of FeSe 2 / Fe 2 O 3 Nanoparticle heterojunction

[0041] take FeSe 2 The nanoparticle powder was placed in a quartz boat, and FeSe was prepared by oxidation at 250 °C for 2 h in an air atmosphere....

Embodiment 2

[0043] 1. Prepare the precursor solution

[0044] 7mL of oleylamine and 9mL of octadecene were added to a three-necked flask to obtain a mixed solution, which was heated to 124°C under an argon atmosphere, and 0.105g of FeCl was added. 2 ·4H 2 O was added to the mixed solution, stirred to be fully dissolved, and a precursor solution was obtained.

[0045] 2. Preparation of FeSe 2 Nanoparticles

[0046] Dissolve 0.079g of Se powder in 2.5mL of oleylamine, then add it dropwise to the precursor solution to obtain a reaction solution, react the reaction solution at 140°C for 0.5h, and then perform centrifugal cleaning (acetone wash once, ethanol Wash 3 times) collect the precipitate and dry it in a vacuum oven at 60°C for 12h to obtain FeSe 2 Nanoparticle powder.

[0047] 3. Preparation of FeSe 2 / Fe 2 O 3 Nanoparticle heterojunction

[0048] Get the FeSe gained in step 2) 2 The nanoparticle powder was placed in a quartz boat and oxidized at 250 °C for 1 h in an air atmo...

Embodiment 3

[0050] 1. Prepare the precursor solution

[0051] Add 8 mL of oleylamine and 9 mL of octadecene into a three-necked flask to obtain a mixed solution, which is heated to 126 ° C under protective gas, and 0.11 g of FeCl is added. 2 ·4H 2 O was added to the mixed solution, stirred to be fully dissolved, and a precursor solution was obtained.

[0052] 2. Preparation of FeSe 2 Nanoparticles

[0053] Dissolve 0.08g of Se powder in 2.3mL of oleylamine, and then add it dropwise to the precursor solution to obtain a reaction solution. The reaction solution was reacted at 146 ° C for 0.6h, and then it was centrifuged and washed (washed once with acetone). , washed with ethanol for 3 times) to collect the precipitate and dry it in a vacuum drying oven at 60 °C for 12 h to obtain FeSe 2 Nanoparticle powder.

[0054] 3. Preparation of FeSe 2 / Fe 2 O 3 Nanoparticle heterojunction

[0055] take FeSe 2 The nanoparticle powder was placed in a quartz boat and oxidized at 280 °C for 3 ...

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Abstract

The invention discloses a ferrous selenide / ferric oxide nanoparticle heterojunction as well as a preparation method and an application thereof, which belong to the field of material preparation. The preparation method comprises the following steps: the reaction temperature in the step 1) is used for removing moisture in the atmosphere; a complex of hydroxyl iron can be formed in the precursor solution; the reaction temperature and time in the step 2) are used for controlling the morphology and size of FeSe2; the FeSe2 nanoparticles are prepared by using FeSe2 as a substrate material, and the oxidation temperature and time are controlled, and the FeSe2 nanoparticles serving as the substrate material are oxidized in air to form Fe2O3 on the surface of the FeSe2 nanoparticles, thereby finallythe FeSe2 / Fe2O3 nanoparticle heterojunction can be formed. The FeSe2 / Fe2O3 nanoparticles are the n-n type heterojunctions, have a high specific surface area and can provide high active sites, and theexistence of the heterojunctions is beneficial to providing higher carrier migration.

Description

technical field [0001] The invention belongs to the field of material preparation, in particular to a ferrous selenide / iron oxide nanoparticle heterojunction, a preparation method and applications thereof. Background technique [0002] The continuous progress of social science and technology has driven the rapid development of the industry, accompanied by a large amount of polluting gas emissions, which has caused a bad impact on the atmospheric environment and seriously threatened the living environment and health of human beings. Detection of harmful gases is the most important part of controlling gas emissions and purifying the atmosphere. Among them, NO 2 It is a typical toxic and harmful gas. In recent years, the NO 2 The real-time and effective detection has attracted widespread attention. Based on this, it is very important to find and develop cheap and high-performance gas sensors. At present, the common gas sensing materials have the problems of high working te...

Claims

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Application Information

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IPC IPC(8): C01G49/06C01B19/04G01N27/12B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B19/007C01G49/06C01P2002/72C01P2004/04G01N27/127
Inventor 戴正飞张旭梁婷婷张鹏飞
Owner 咸阳瞪羚谷新材料科技有限公司
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