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Reduced graphene oxide-polyethyleneimine-Co3O4 oxide semiconductor composite material, preparation method and application

A technology of oxide semiconductor and polyethyleneimine, which is applied in the field of reduced graphene oxide-polyethyleneimine-cobalt tetraoxide oxide semiconductor composite material and its preparation and application, can solve the problems of low sensitivity and low selectivity, and achieve the goal of using The method is simple and the crystallinity is good

Inactive Publication Date: 2017-08-11
HEILONGJIANG UNIV
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  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of low selectivity and low sensitivity of the existing sensitive materials for detecting ammonia at room temperature, the presen

Method used

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  • Reduced graphene oxide-polyethyleneimine-Co3O4 oxide semiconductor composite material, preparation method and application
  • Reduced graphene oxide-polyethyleneimine-Co3O4 oxide semiconductor composite material, preparation method and application
  • Reduced graphene oxide-polyethyleneimine-Co3O4 oxide semiconductor composite material, preparation method and application

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Example Embodiment

[0029] Specific embodiment 1: This embodiment reduces graphene oxide-polyethyleneimine-cobalt tetroxide oxide semiconductor composite material, which is made of reduced graphene oxide, directing agent and cobalt-containing material;

[0030] The mass ratio of the reduced graphene oxide to the directing agent is 1: (27-167); the mass ratio of the cobalt-containing material to the directing agent is 1: (0.4 to 3).

[0031] This embodiment has the following beneficial effects:

[0032] The reduced graphene oxide-polyethyleneimine-cobalt tetraoxide semiconductor oxide composite material of this embodiment is used as a sensitive material to detect ammonia in the air. It does not require a heating system and can be at room temperature, ie, 20°C to 30°C, and humidity Operating under the condition of 25% to 35%, the molar concentration of ammonia gas detected is as low as 0.03ppm, the sensitivity is higher than 14.3%, and the method of use is simple;

[0033] The Co of the reduced graphene ox...

Example Embodiment

[0034] Specific embodiment two: This embodiment is different from the specific embodiment one in that the directing agent is polyethyleneimine. The other steps and parameters are the same as in the first embodiment.

Example Embodiment

[0035] Specific embodiment three: This embodiment is different from specific embodiment one or two in that the cobalt-containing material is cobalt nitrate hexahydrate, and the molecular formula of cobalt nitrate hexahydrate is Co(NO 3 ) 2 ·6H 2 O. The other steps and parameters are the same as in the first or second embodiment.

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Abstract

The invention relates to a reduced graphene oxide-polyethyleneimine-Co3O4 oxide semiconductor composite material, a preparation method and an application and aims to solve the problem that the conventional ammonia gas detecting sensitive material is low in selectivity and sensitivity at room temperature. The composite material is prepared from reduced graphene oxide, a directing agent and a cobalt-containing material. The preparation method comprises the following steps: 1, preparation of reduced graphene oxide suspension; 2, preparation of a polyethyleneimine solution and reduced graphene oxide suspension mixed solution; 3, regulation of pH; 4, aging; 5, hydrothermal synthesis. The sensitivity of the prepared composite material is higher than 14.3% when the composite material serving as a sensitive material is used for detecting ammonia gas in air, an application method is simple, and formed Co3O4 is a polycrystalline material and has higher degree of crystallinity. The invention applies to preparation of the oxide semiconductor composite material.

Description

technical field [0001] The invention relates to a reduced graphene oxide-polyethyleneimine-cobalt trioxide oxide semiconductor composite material, a preparation method and an application. Background technique [0002] Today, with frequent smog phenomena, the formation and harm of PM 2.5 have attracted much attention, except for SO 2 , NO x In addition to substances that can directly form aerosols and PM 2.5, there is another important source of pollution that has been neglected by people, namely ammonia pollution, which is one of the main culprits for the continuous increase of PM 2.5 index. Facts have shown that ammonia is indeed one of the main precursors for the formation of PM 2.5, and 15-35% of the nitrogen in the final PM 2.5 in the atmosphere comes from ammonia. relative to H 2 S. NO x , SO 2 , CO and other well-known toxic and harmful gases, the relative density of ammonia is low, about 20-30ppb, and the concentration difference between urban and rural areas is ...

Claims

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Application Information

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IPC IPC(8): G01N27/04G01N27/30
CPCG01N27/04G01N27/041G01N27/30G01N27/308
Inventor 史克英李丽刘思宇
Owner HEILONGJIANG UNIV
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