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A rare earth doped modified graphene composite material gas sensor for detecting NOx and its preparation method

A composite material, rare earth doping technology, applied in the direction of material resistance, can solve the problems of poor gas sensor resistance, long response time, low sensitivity of gas sensitive materials, etc., to achieve enhanced gas sensing performance, good electrical conductivity, improved The effect of gas-sensing response

Inactive Publication Date: 2016-05-11
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention aims to solve the problems of low sensitivity, long response time and poor resistance of the gas sensor to various factors other than gas concentration in the existing gas sensitive materials, and provides a method for detecting NO x Rare earth-doped modified graphene composite gas sensor and preparation method thereof

Method used

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  • A rare earth doped modified graphene composite material gas sensor for detecting NOx and its preparation method
  • A rare earth doped modified graphene composite material gas sensor for detecting NOx and its preparation method
  • A rare earth doped modified graphene composite material gas sensor for detecting NOx and its preparation method

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specific Embodiment approach 1

[0017] Specific implementation mode one: a kind of method for detecting NO in this implementation mode x Rare earth-doped modified graphene composite gas sensor, a kind of gas sensor for detecting NO x The rare earth-doped modified graphene composite material gas sensor consists of graphene, distilled water, copper acetate solution with a concentration of 10mmol / L~20mmol / L, cerium nitrate solution with a concentration of 10mmol / L~20mmol / L, and a concentration of Preparation of 16mmol / L~32mmol / L sodium hydroxide solution and 6mmol / L~12mmol / L glucose solution to obtain rare earth doped modified graphene composite material, and rare earth doped modified graphene composite material It is prepared by mixing with a dispersant, adding the dispersion liquid onto the surface of the gold interdigitated electrode, and finally drying;

[0018] The quality of described graphene and the volume ratio of distilled water are 1g:(5~10) L; The quality of described graphene and the volume ratio ...

specific Embodiment approach 2

[0020]Embodiment 2: This embodiment is different from Embodiment 1 in that: the graphene is graphite oxide or expanded graphite. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0021] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the described graphite oxide is prepared according to the following steps:

[0022] 1. Treatment of natural flake graphite: H 2 SO 4 Place in a reaction vessel, heat the reaction vessel to 88°C-92°C under oil bath conditions, then add potassium persulfate, and add potassium persulfate within 16min-20min, then add P 2 o 5 And lower the temperature to 75°C-80°C. Under the condition of stirring at 75°C-80°C, add 200-300-mesh natural flake graphite and react for 30min-40min to obtain a mixture, and place the mixture at a temperature of 75°C-85 Dry in an oven at ℃ for 4h-5h, and finally wash the dried mixture until the pH of the washing liquid is 7 to obtain pretreated graphite; the mass and mass fraction of the natural flake graphite are 18%-22% h 2 SO 4 The volume ratio is 1g:(5~6) mL; the mass ratio of described natural flake graphite and potassium persulfate is 1...

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Abstract

The invention provides a rare-earth doped modified graphene composite material gas sensitive element for detecting NOx and a preparation method of the gas sensitive element, and relates to a gas sensitive element for detecting the NOx and the preparation method of the gas sensitive element, solving the problems that an existing gas sensitive material is low in sensitivity, slow in response, and poor in resistance to factors except gas concentration. The rare-earth doped modified graphene composite material gas sensitive element for detecting the NOx is prepared from graphene, distilled water, a cupric acetate solution, a ceric nitrate solution, a sodium hydroxide solution and a glucose solution; an obtained rare-earth doped modified graphene composite material is mixed with a dispersant and a dispersion solution is dropwise added to the surface of a gold interdigital electrode to prepare the rare-earth doped modified graphene composite material gas sensitive element. The preparation method comprises the following steps: 1, preparation of the rare-earth doped modified graphene composite material; and 2, assembling of the composite material gas sensitive element.

Description

technical field [0001] The present invention relates to the detection of NO x Gas sensor and its preparation method. Background technique [0002] With the acceleration of the world's industrialization process and the rapid development of cities, human beings emit a large amount of NO in production and life. x . It is of obvious and very important strategic significance to study new gas-sensing materials with high performance. Sensor technology is one of the important foundations of modern detection and automation technology, and it has penetrated into various fields of human life. With the increasing popularization and application of microcomputer and microelectronic technology, new requirements are put forward for the performance, quantity and use of sensors, which makes people pay more attention to the development of new sensors. Graphene is the most active and promising gas-sensing material in the field of gas-sensing research. [0003] Metal-oxide-semiconductor gas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
Inventor 李丽宋嘉宝王婧超田野史克英
Owner HEILONGJIANG UNIV
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