Gas sensitive element by taking single-walled carbon nanotube/phthalocyanine composite material as ammonia-sensitive material and preparation method thereof

A single-walled carbon nanotube and composite material technology, which is applied in the field of gas sensing elements and their preparation, can solve the problems of poor reversibility and high resistance value, and achieve the effects of fast response, excellent comprehensive performance and improved gas sensing performance.

Inactive Publication Date: 2013-09-18
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The present invention aims to solve the problems of poor reversibility of the gas sensor with single single wall carbon nanotube as ammonia sensitive material and high resistance value of the gas sensor with metal phthalocyanine as ammonia sensitive material, and provides a single wall carbon nanotube Gas sensor with nanotube / phthalocyanine composite material as ammonia sensitive material and preparation method thereof

Method used

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  • Gas sensitive element by taking single-walled carbon nanotube/phthalocyanine composite material as ammonia-sensitive material and preparation method thereof
  • Gas sensitive element by taking single-walled carbon nanotube/phthalocyanine composite material as ammonia-sensitive material and preparation method thereof
  • Gas sensitive element by taking single-walled carbon nanotube/phthalocyanine composite material as ammonia-sensitive material and preparation method thereof

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specific Embodiment approach 1

[0016] Specific Embodiment 1: In this embodiment, a gas sensor with single-wall carbon nanotube / phthalocyanine composite material as ammonia-sensitive material is composed of interdigital electrodes and single-wall carbon nanotube / phthalocyanine composite material; The phthalocyanine in the single-wall carbon nanotube / phthalocyanine composite material is a pentyloxy metal phthalocyanine.

[0017] The gas sensor using the single-walled carbon nanotube / phthalocyanine composite material as the ammonia-sensitive material described in this embodiment mode is at room temperature, and at room temperature, 0.6ppm~80ppmNH 3 It has a good response in the concentration range, and the low concentration of NH in the range of 0.6ppm to 40ppm 3 range NH 3 There is a good linear relationship between concentration and response, and 600ppb NH can be detected 3 .

[0018] The gas sensor using the single-walled carbon nanotube / phthalocyanine composite material as the ammonia-sensitive material...

specific Embodiment approach 2

[0019] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the structural formula of the pentyloxy metal phthalocyanine is or in M in is Cu, Pb, Ni, Co or Zn; Wherein M in is Cu, Pb, Ni, Co or Zn; Wherein M in is Cu, Ni, Co or Zn. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0020] Specific embodiment three: In this embodiment, a method for preparing a gas sensor using a single-walled carbon nanotube / phthalocyanine composite material as an ammonia-sensitive material is carried out according to the following steps:

[0021]1. Preparation of carboxylated single-walled carbon nanotubes: Add single-walled carbon nanotubes into an aqueous solution of nitric acid with a concentration of 2mol / L-3mol / L, reflux reaction at a temperature of 80°C-90°C for 36h-48h, and obtain filtered Cake, disperse the filter cake in a hydrochloric acid aqueous solution with a concentration of 0.5mol / L-2mol / L, vibrate ultrasonically for 10min-30min, filter to obtain purified single-walled carbon nanotubes, and then place the obtained purified single-walled carbon nanotubes in mixed acid Heat treatment to obtain the reacted solution, add deionized water to the reacted solution for dilution, and then filter with 0.20 μm polytetrafluoroethylene filter membrane to obtain the crud...

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Abstract

The invention discloses a gas sensitive element by taking a single-walled carbon nanotube / phthalocyanine composite material as an ammonia-sensitive material and a preparation method thereof and relates to a gas sensitive element for measuring ammonia concentration and a preparation method thereof. The invention aims to solve the problems that a gas sensitive element by taking a single single-walled carbon nanotube as an ammonia-sensitive material is poor in reversibility and a gas sensitive element by taking metal phthalocyanine as an ammonia-sensitive material is high in resistance value. The gas sensitive element by taking the single-walled carbon nanotube / phthalocyanine composite material as the ammonia-sensitive material consists of an interdigital electrode and a single-walled carbon nanotube / phthalocyanine composite material. The preparation method comprises the following steps: 1. preparing a carboxylated single-walled carbon nanotube; 2. preparing the single-walled carbon nanotube / phthalocyanine composite material; and 3. dispensing to obtain the gas sensitive element by taking the single-walled carbon nanotube / phthalocyanine composite material as the ammonia-sensitive material. The invention can be used for preparing the gas sensitive element by taking the single-walled carbon nanotube / phthalocyanine composite material as the ammonia-sensitive material.

Description

technical field [0001] The invention relates to a gas sensor for measuring ammonia concentration and a preparation method thereof. Background technique [0002] With the continuous deepening of human understanding of sustainable development strategies, environmental pollution and climate change issues have attracted great attention from all over the world. At the same time, the types and quantities of gases used and produced by people in production and life are increasing year by year. The harmful gases in them not only pollute the environment and affect the climate, but also have the danger of explosion, fire and poisoning. As one of the most effective ways to detect harmful gases, gas sensors have attracted extensive attention from business groups and research institutions around the world in recent years. Traditional semiconductor-based metal oxide materials (such as ZnO, SnO 2 and Fe 2 o 3 etc.) sensors have been widely used to detect nitrogen-containing harmful gase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 王彬吴谊群陈志敏贺春英
Owner HEILONGJIANG UNIV
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