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Reduced graphene oxide-polyethyleneimine-cobalt trioxide oxide semiconductor composite material and its preparation method and application

A technology of oxide semiconductor and polyethyleneimine, which is applied in the direction of material resistance, analysis of materials, and electrochemical variables of materials, can solve the problems of low selectivity and low sensitivity, and achieve the effect of simple use and good crystallinity

Inactive Publication Date: 2019-06-07
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 present invention further provides a reduced graphene oxide-polyethyleneimine-cobalt tetraoxide semiconductor composite material and its preparation method and application

Method used

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  • Reduced graphene oxide-polyethyleneimine-cobalt trioxide oxide semiconductor composite material and its preparation method and application
  • Reduced graphene oxide-polyethyleneimine-cobalt trioxide oxide semiconductor composite material and its preparation method and application
  • Reduced graphene oxide-polyethyleneimine-cobalt trioxide oxide semiconductor composite material and its preparation method and application

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specific Embodiment approach 1

[0027] Specific Embodiment 1: In this embodiment, the reduced graphene oxide-polyethyleneimine-cobalt oxide semiconductor composite material is made of reduced graphene oxide, a directing agent, and a cobalt-containing material;

[0028] 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:(0.4-3).

[0029] This embodiment has the following beneficial effects:

[0030] The reduced graphene oxide-polyethyleneimine-cobalt tetraoxide semiconductor oxide composite material of this embodiment is used as a sensitive material for detecting ammonia in the air. It does not require a heating system and can be used at room temperature, that is, 20°C to 30°C, and the humidity is Operating under the condition of 25% to 35%, the molar concentration of ammonia detected is as low as 0.03ppm, the sensitivity is higher than 14.3%, and the method of use is simple;

[0031] Co 3 o 4 The p...

specific Embodiment approach 2

[0032] Embodiment 2: This embodiment is different from Embodiment 1 in that: the directing agent is polyethyleneimine. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0033] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is 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. Other steps and parameters are the same as those in Embodiment 1 or 2.

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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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Patent Type & Authority Patents(China)
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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