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Room temperature graphene oxide/phthalocyanine composite material ammonia sensitive element and preparation method thereof
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A composite material and graphene technology, applied in the direction of material resistance, etc., can solve the problems of high resistance, poor reversibility and selectivity of the gas sensor, achieve good sensitivity, fast response, and improve the effect of gas sensor performance
Inactive Publication Date: 2016-04-13
HEILONGJIANG UNIV
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[0003] The purpose of the present invention is to provide a graphene oxide / phthalocyanine at room temperature in order to solve the technical problem of poor reversibility and selectivity of the graphene oxide ammonia sensor and the high resistance value of the gas sensor in which metal phthalocyanine is the ammonia sensitive material. Composite material ammonia sensitive element and preparation method thereof
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specific Embodiment approach 1
[0025] Specific Embodiment 1: In this embodiment, the room-temperature graphene oxide / phthalocyanine composite material ammonia-sensitive element is composed of an interdigitated electrode and a graphene oxide / phthalocyanine composite material; wherein the phthalocyanine in the graphene oxide / phthalocyanine composite material The cyanine is an amino metal phthalocyanine.
[0026] The graphene oxide / phthalocyanine composite material ammonia-sensitive element described in the present embodiment is at room temperature, at 12.5ppm-3200ppmNH 3 It has a better response in the concentration range, and at a lower concentration of NH 3 range NH 3 There is a good linear relationship between concentration and response.
[0027] The room temperature graphene oxide / phthalocyanine composite material ammonia sensor described in this embodiment has good sensitivity, reversibility, and stability in different concentrations of ammonia, and has good sensitivity to the same concentration of CO ...
specific Embodiment approach 2
[0028] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the general formula of the amino metal phthalocyanine is MPcR x (NH 2 ) y , wherein x is 0 or 3, y is 1 or 4, R is an alkyl or alkoxy group, and wherein M is Cu, Ni, Fe, Co, Pb or Zn. . Others are the same as in the first embodiment.
specific Embodiment approach 3
[0029] Specific embodiment three: the preparation method of the room temperature graphene oxide / phthalocyanine composite material ammonia-sensitive element in this embodiment is carried out according to the following steps:
[0031] Graphene oxide is dispersed in N, N-dimethylformamide, obtains the solution that graphene oxide concentration is 10-50mg / ml, then according to graphene oxide mass and thionyl chloride volume ratio is 1mg: (1- 2) Add thionyl chloride in the proportion of ml, stir and heat under reflux for 24-36 hours under the condition of 70-80°C, distill and remove thionyl chloride, according to the mass ratio of phthalocyanine to graphene oxide (0.5-5 ): 1. Add phthalocyanine N,N-dimethylformamide solution and triethylamine at a ratio of (10-30)mg:1mL by volume to triethylamine, under nitrogen protection, 60-100°C Stir the reaction for 72-96 hours under certain conditi...
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Abstract
The invention discloses a room-temperature oxidized graphene / phthalocyanin composite ammonia sensitive element and a preparation method thereof, relating to an ammonia sensitive element and a preparation method thereof. The invention aims to solve the technical problems that the reversibility and selectivity of an oxidized graphene ammonia sensitive element are poor and a gas sensitive element with metal phthalocyanin as an ammonia sensitive material has a relatively high resistance value. The method comprises the steps of firstly, preparing an oxidized graphene / phthalocyanin composite ammonia sensitive material; secondly, preparing an oxidized graphene / phthalocyanin composite gas sensitive element. The room-temperature oxidized graphene / phthalocyanin composite ammonia sensitive element has better response at room temperature within the NH3 concentration range of 12.5-3200ppm, has a good linear relation between NH3 concentration and the response within a relatively low NH3 concentration range, and has favorable sensitivity, reversibility and stability in different-concentration ammonia gases. The room-temperature oxidized graphene / phthalocyanin composite ammonia sensitive element and the preparation method thereof belong to the preparation field of gas sensitive elements.
Description
technical field [0001] The invention relates to an ammonia sensitive element and a preparation method thereof. Background technique [0002] Compared with traditional gas-sensing materials, graphene has a unique two-dimensional nanostructure, huge specific surface area, relatively high electrical conductivity, carrier mobility and stable physical and chemical properties. A class of gas-sensitive nanomaterials with the most research and practical value has become one of the research hotspots in the field of gas sensors at home and abroad in recent years. Since A. Geim and K. Novoselov successfully separated stable graphene (Graphene) for the first time in 2004, and won the Nobel Prize in 2010, graphene has been attracted by the fields of physics, chemistry and materials science as well as high-tech for its extraordinary properties. All countries in the world have invested a lot of research and development in preparation and application, hoping to occupy the commanding height...
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