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Room temperature NH3 sensor based on DPA-Ph-DBPzDCN and gold interdigital electrode and preparation method therefor

An interdigital electrode and finger electrode technology are applied in the room temperature ammonia gas sensor and its preparation, and in the field of rapid detection of ammonia gas at room temperature, which can solve the problems of low response value and long response recovery time, so as to reduce the working temperature and improve the response. Speed ​​and sensitivity, effect of reducing output resistance

Active Publication Date: 2018-12-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with MOS gas sensors, this type of sensor has disadvantages such as low response value and long response recovery time.

Method used

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  • Room temperature NH3 sensor based on DPA-Ph-DBPzDCN and gold interdigital electrode and preparation method therefor
  • Room temperature NH3 sensor based on DPA-Ph-DBPzDCN and gold interdigital electrode and preparation method therefor
  • Room temperature NH3 sensor based on DPA-Ph-DBPzDCN and gold interdigital electrode and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The DPA-Ph-DBPzDCN organic material was coated on the gold interdigitated electrode substrate by the spin coating method to prepare a room temperature ammonia sensor, and the gas sensing performance of the sensor was tested at 98% relative humidity. The specific process is as follows:

[0034] 1. Preparation of DPA-Ph-DBPzDCN sensitive material: under nitrogen atmosphere, heat 6mmol of 3,6-dibromophenanthrenequinone and 6mmol of 4,5-diaminophthalonitrile in 20mL of acetic acid to reflux at 125°C React for 8 hours. Washing and vacuum sublimation at 260°C gave a pale yellow substance, namely 3,6-dibromodibenzo[a,c]phenazine-11,12-dicarbonitrile. 2mmol of the obtained product was reacted with 4.4mmol of 4-diphenylaminophenylboronic acid, 48mL of tetrahydrofuran, and 16mL of water under reflux at 100°C for 12 hours, and the product was column layered with methylene chloride and petroleum ether (volume ratio: 3:1) DPA-Ph-DBPzDCN was obtained by vacuum sublimation at 420°C. ...

Embodiment 2

[0038] Table 1: The room temperature ammonia sensor prepared by the present invention responds to 100ppm ammonia response data at different humidity

[0039]

[0040] Table 2: The response value of the device at 98% RH as a function of ammonia concentration

[0041] Ammonia concentration (ppm)

Response value (S)

2

8.27％

5

20.85％

10

23.08％

20

44.86％

50

58.33％

100

72.73％

[0042] Connect the SM-8213 signal tester to the square resistor, and place the sensor in the atmosphere of air, 2ppm ammonia, 5ppm ammonia, 10ppm ammonia, 20ppm ammonia, 50ppm ammonia, and 100ppm ammonia to test the resistance signal. The response value of the device is ΔR / R 空气 , ΔR=R 空气 -R 氨气 .

[0043] Table 1 lists the room temperature ammonia sensors based on DPA-Ph-DBPzDCN as the sensitive material and gold interdigitated electrodes at 98%RH, 85%RH, 75%RH, 59%RH, 33%RH, 25% Response value to 100ppm ammonia gas under %RH. It c...

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Abstract

Disclosed is a room temperature ammonia (NH3) sensor based on DPA-Ph-DBPzDCN and gold interdigital electrodes and preparation method therefor, belonging to the technical field of gas sensors. The roomtemperature NH3 sensor is composed of an Al2O3 ceramic plate, gold interdigital electrode bases, and a DPA-Ph-DBPzDCN sensitive material thin film from bottom to top. The preparation method comprisesthe following steps: preparing a DPA-Ph-DBPzDCN sensitive material through Suzuki coupling reaction; separately preparing nickel and gold on the Al2O3 ceramic substrate to prepare interdigital electrodes by sputtering; and preparing the DPA-Ph-DBPzDCN sensitive material on the interdigital electrodes by using a spin coating method. According to the room temperature NH3 sensor based on DPA-Ph-DBPzDCN and gold interdigital electrodes and preparation method therefor, a novel organic material DPA-Ph-DBPzDCN is used as a sensitive material, so that the working temperature of the sensor is effectively reduced, and ammonia gas can be detected at room temperature; and good selectivity and stability are achieved besides a rapid response speed for ammonia gas at room temperature.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, in particular to a room temperature ammonia (NH 3 ) sensor and a preparation method thereof, which are mainly used for rapid detection of ammonia at room temperature. Background technique [0002] Ammonia (NH 3 ) is a colorless gas with a strong pungent odor, which can burn the skin, eyes, and mucous membranes of the respiratory organs. When the concentration of inhalation is too high (above 500ppm), it will cause lung swelling and even death. Since ammonia gas is easily liquefied into a colorless liquid or solidified into a snow-like solid, it is mostly used in the preparation of liquid nitrogen, ammonia water, nitric acid, ammonium salts, and amines. has important applications. NH 3 It is generally produced in production and living activities such as building construction, interior decoration, and farming and animal husbandry, and is affected by environmental factors such as humidity. F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/126
Inventor 刘方猛贺俊铭卢革宇王悦康博南孙鹏闫旭梁喜双高原刘凤敏王小龙
Owner JILIN UNIV
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