Hemin-graphene composite material and application in detection of nitric oxide gas

A composite material and hematin technology, which is applied in the hematoxylin-graphene composite material and its application in the detection of nitric oxide gas, can solve the problem of long response time and recovery time, poor sensitivity and selectivity, high Working temperature and other issues, to achieve the effect of high sensitivity and selectivity, easy separation and high yield

Active Publication Date: 2021-06-25
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some studies have used metal oxides such as tungsten oxide, zinc oxide, tin oxide, etc. for gas phase sensing of NO, but these gas sensing materials require high operating temperature (>200°C) and high energy consumption, and show poor performance at room temperature. Poor sensitivity and selectivity with long response and recovery times

Method used

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  • Hemin-graphene composite material and application in detection of nitric oxide gas
  • Hemin-graphene composite material and application in detection of nitric oxide gas
  • Hemin-graphene composite material and application in detection of nitric oxide gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment provides a hematin-graphene composite material, which is prepared according to the following steps:

[0047] (1) Synthesis of graphene oxide: In this embodiment, graphene oxide is synthesized by means of low temperature reaction-medium temperature reaction-high temperature reaction-centrifugation, as follows:

[0048] Low-temperature reaction: Take 23mL of 98% concentrated sulfuric acid and add it to a beaker of appropriate size, use pre-made ice cubes to cool it down to -1~1°C, then add 1g of natural graphite, stir for 50 minutes, and then slowly add 6g of potassium permanganate, stirred for 3 hours. During this period, the system temperature was kept at -1-1°C.

[0049] Medium temperature reaction: transfer the above system to a constant temperature water bath at 40°C, and stir for 45 minutes.

[0050] High temperature reaction: transfer the above system to a constant temperature water bath at 80°C. After the temperature of the system rises to 80°C, ...

Embodiment 2

[0079] Embodiment 2: Embodiment 2 provides a hematin-graphene composite material. The synthesis process is the same as that of Embodiment 1, except that the temperature for the solvothermal reaction in step (2) is 150° C.

[0080] Effect comparative example 4 first prepared the gas-sensing electrode based on the composite material of comparative example 4 and the crystalline hemin-graphene composite material of embodiment 2 by the drop coating method, and the gas-sensing electrode was prepared by the following steps: respectively The anhydrous ethanol dispersion solution of the composite material prepared in Comparative Example 4 and Example 2 was shaken evenly, and 10 μL of the above solution was dropped on the interdigitated electrode of a commercial ceramic substrate, and the interdigitated electrode was heated on a hot stage at 75°C After 15 minutes, the ethanol solvent was completely evaporated.

[0081] The gas sensing performance of the above-mentioned gas-sensing elect...

Embodiment 3

[0083] Example 3 provides a dispersion of a composite material. The synthesis process is the same as that of Example 1, except that the amount of ammonia water added in step (2) is 360 μL.

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Abstract

The invention discloses a hemin-graphene composite material and an application in detection of nitric oxide gas. The hemin-graphene composite material comprises hemin and a sheet-like material coating the hemin, wherein the sheet-like material is nitrogen-doped reduced graphene oxide, the hemin is a crystal, the structure formula of the hemin is defined in the specification, R1 to R8 are respectively and independently selected from -H, alkyl, alkylene, hydroxyalkyl, -R9-COOH, amino, aminoalkyl, alkoxy, phenyl and phenylamino, R9 is alkylene, M is a transition metal cation, P is an anion, n represents the number of charges, and n is a natural number. According to the invention, the composite material formed by wrapping the hemin with crystals and the nitrogen-doped rGO can accurately detect nitric oxide gas molecules, the detection process can be carried out at room temperature, and the composite material has very high selectivity and stability and has a relatively great application prospect in the fields of biosafety, disease diagnosis and treatment and the like.

Description

technical field [0001] The invention relates to the technical field of gas detection, in particular to a hemin-graphene composite material and its application in detecting nitric oxide gas. Background technique [0002] As a non-invasive disease diagnosis and treatment method, human breath detection has the advantages of fast sensitivity, portability, and low cost. In recent years, a variety of new respiratory infectious diseases have broken out globally. The development of breath detection technology for rapid diagnosis and treatment of diseases is undoubtedly a beneficial supplement and an important technical reserve in the field of national biosecurity. Nitric oxide (NO) is an important messenger molecule in the human body, and it is a marker of respiratory diseases such as asthma in human exhalation. The development of sensing and detection technology for low-concentration NO is still a major challenge in this field. [0003] Traditional gas detection and analysis metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/125Y02A50/20
Inventor 王耀王建强高宜逊周国富
Owner SOUTH CHINA NORMAL UNIVERSITY
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