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A Nitrogen Dioxide Gas Sensitive Material Based on Tetrapyrenylporphyrin Cobalt Aggregates

A technology of gas-sensitive materials and aggregates, which is applied in the field of nitrogen dioxide detection at room temperature, can solve the problems of low responsivity of gas sensors, poor conductivity of porphyrin, and low sensitivity, and achieve improved electron migration ability, increased sensitivity, and preparation The effect of simple process and equipment

Inactive Publication Date: 2021-08-10
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poor conductivity of porphyrin molecules makes the prepared gas sensors show defects such as low responsivity, low sensitivity, and poor selectivity, which limits its further application.

Method used

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  • A Nitrogen Dioxide Gas Sensitive Material Based on Tetrapyrenylporphyrin Cobalt Aggregates
  • A Nitrogen Dioxide Gas Sensitive Material Based on Tetrapyrenylporphyrin Cobalt Aggregates
  • A Nitrogen Dioxide Gas Sensitive Material Based on Tetrapyrenylporphyrin Cobalt Aggregates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Cobalt tetrapyrenylporphyrin was used as an organic semiconductor material to detect nitrogen dioxide gas under dry conditions. First, pipette the assembled cobalt tetrapyrenylporphyrin and drop 1-2 drops on the ITO conductive glass, and keep heating at 35 degrees Celsius for 1 hour on a hot stage to ensure that the solution is fully volatilized. Finally, the ITO conductive glass with cobalt tetrapyrenylporphyrin was tested for gas sensitivity on the Keysight B2912A instrument, and finally the detection of nitrogen dioxide gas by cobalt tetrapyrenylporphyrin under dry conditions was obtained.

Embodiment 2

[0029] Example 2: Cobalt tetrapyrenylporphyrin was used as an organic semiconductor material to detect nitrogen dioxide gas under humidity conditions. First, pipette the assembled cobalt tetrapyrenylporphyrin and drop 1-2 drops on the ITO conductive glass, and keep heating at 35 degrees Celsius for 1 hour on a hot stage to ensure that the solution is fully volatilized. Finally, the ITO conductive glass with tetrapyreneyl porphyrin cobalt is subjected to a gas sensitivity test on the Keysight B2912A instrument, and the nitrogen gas passing through the ITO conductive glass is passed through a certain concentration of sodium chloride solution, thereby controlling its humidity to be 0%, and finally The detection sensitivity of cobalt tetrapyrenylporphyrin to nitrogen dioxide gas reaches 44.7% under the condition of 0% humidity, and the minimum detection limit is 50ppb.

Embodiment 3

[0030] Example 3: Cobalt tetrapyrenylporphyrin was used as an organic semiconductor material to detect nitrogen dioxide gas under humidity conditions. First, pipette the assembled cobalt tetrapyrenylporphyrin and drop 1-2 drops on the ITO conductive glass, and keep heating at 35 degrees Celsius for 1 hour on a hot stage to ensure that the solution is fully volatilized. Finally, the ITO conductive glass with tetrapyrenyl porphyrin cobalt is subjected to a gas sensitivity test on the Keysight B2912A instrument, and the nitrogen gas passing through the ITO conductive glass is passed through a certain concentration of sodium chloride solution, thereby controlling its humidity to be 45%, and finally The detection sensitivity of cobalt tetrapyrenylporphyrin to nitrogen dioxide gas reaches 92.9% under the condition of humidity of 45%, and the minimum detection limit is 50ppb.

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Abstract

The invention relates to the research field of nitrogen dioxide detection at room temperature, in particular to the preparation and application of a tetrapyrenylporphyrin cobalt aggregate gas-sensitive material. Four pyrene groups are introduced into the four meso-positions of porphyrin to obtain 5,10,15,20-tetrakis(1-pyrenyl)cobalt porphyrin, and the tetrapyrene cobalt porphyrin is used in dichloro The solubility in methane and methanol has the characteristics of significant difference, add 2.5mL methanol to 0.5mL1×10 ‑3 In the dichloromethane solution of mol / L cobalt tetrapyrenylporphyrin, self-assembled aggregates were precipitated; the generated self-assembled aggregates were added dropwise on a glass substrate with ITO interdigitated electrodes as a semiconductor active layer, realizing Low concentration of NO in the range of 0% to 75% humidity at room temperature 2 Sensitive and rapid detection, the detection limit is 50ppb.

Description

technical field [0001] The invention relates to the research field of nitrogen dioxide detection at room temperature, in particular to the preparation and application of a tetrapyrenylporphyrin cobalt aggregate gas-sensitive material. Four pyrene groups are introduced into the four meso-positions of porphyrin to obtain 5,10,15,20-tetrakis(1-pyrenyl)porphyrin cobalt compound, and the tetrapyrene cobalt porphyrin compound is used in dichloro The solubility in methane and methanol has the characteristics of significant difference, add 2.5mL methanol to 0.5mL 1×10 -3 In the dichloromethane solution of mol / L cobalt tetrapyrenylporphyrin, self-assembled aggregates were precipitated; the generated self-assembled aggregates were added dropwise on a glass substrate with ITO interdigitated electrodes as a semiconductor active layer, realizing Low concentration of NO in the range of 0% to 75% humidity at room temperature 2 Sensitive and rapid detection, the detection limit is 50ppb. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
Inventor 孙琦琦李东封维港杨超逸刘承奔陈艳丽
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)