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Planar room-temperature NH3 sensor based on TPA-DCPP (7,10-bis(diphenyl amino) phenyl-2,3-dicyanopyrazino phenanthrene) organic sensitive film, and preparation method thereof

A technology of ammonia sensor and sensitive thin film, which is applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problems of poor response recovery characteristics, low sensitivity, easy attenuation, etc., to improve the detection limit and sensitivity, and the device preparation method is simple, The effect of reducing the output resistance

Inactive Publication Date: 2019-07-23
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of sensor has disadvantages such as low sensitivity, poor response recovery characteristics, and long response recovery time.
At the same time, in terms of the selection of sensor types, the manufacturing methods of side-heating devices are complicated and the individual differences are large, while organic thin-film transistor devices (OFET) have the disadvantages of poor device stability and easy attenuation.

Method used

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  • Planar room-temperature NH3 sensor based on TPA-DCPP (7,10-bis(diphenyl amino) phenyl-2,3-dicyanopyrazino phenanthrene) organic sensitive film, and preparation method thereof
  • Planar room-temperature NH3 sensor based on TPA-DCPP (7,10-bis(diphenyl amino) phenyl-2,3-dicyanopyrazino phenanthrene) organic sensitive film, and preparation method thereof
  • Planar room-temperature NH3 sensor based on TPA-DCPP (7,10-bis(diphenyl amino) phenyl-2,3-dicyanopyrazino phenanthrene) organic sensitive film, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The TPA-DCPP organic sensitive material was coated on the gold interdigital electrode substrate by spin coating to prepare the room temperature ammonia sensor, and the gas sensitivity of the sensor was tested under 98% relative humidity. The specific process is as follows:

[0033] 1. Preparation of TPA-DCPP organic sensitive material: TPA-DCPP sensitive material is prepared by Suzuki coupling reaction. The synthesis process is as described above. For details, please refer to Angewandte Chemie International Edition (DOI: 10.1002 / anie.201506687) and ZL 201510267689.9.

[0034] 2. Making golden interdigital electrodes and square resistors: in Al with a length and width of 8.2×8.2mm 2 O 3 Photolithographic transfer of the designed electrode mask pattern on the ceramic substrate (8mm×8mm size, the middle area is the interdigital shape, the logarithm is 10 pairs, there is a square resistor at the upper and lower four corners, and the side length is 2×2mm , The width of each interd...

Embodiment 2

[0037] Table 1: Response value data of room temperature ammonia gas sensor prepared by the present invention to 100ppm ammonia gas under different humidity

[0038]

[0039] Table 2: The response value of the device under 98%RH varies with the ammonia concentration

[0040] Ammonia concentration (ppm) Response value (S) 0.55.38％ 114.00％ 215.53％ 522.67％ 1027.18％ 2048.75％ 5054.00％ 10076.34％

[0041] Connect the SM-8213 resistance signal tester to the square resistance, and the sensors are placed in air, 500ppb ammonia, 1ppm ammonia, 2ppm ammonia, 5ppm ammonia, 10ppm ammonia, 20ppm ammonia, 50ppm ammonia, 100ppm ammonia Conduct resistance signal test in a good atmosphere. The response value of the device is ΔR / R air , ΔR=R air -R Ammonia .

[0042] Table 1 lists the room temperature ammonia sensors with TPA-DCPP as the organic sensitive film and the gold interdigital electrode as the substrate respectively at 98%RH, 85%RH, 75%RH, 59%RH, 35%RH, 25% RH, 17% RH response value to ...

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Abstract

The invention discloses a planar room-temperature NH3 sensor based on a TPA-DCPP (7,10-bis(diphenyl amino) phenyl-2,3-dicyanopyrazino phenanthrene) organic sensitive film, and a preparation method thereof, and belongs to the technical field of gas sensors. The sensor consist of an Al2O3 ceramic plate, a gold interdigital electrode and a TPA-DCPP organic sensitive material film from bottom to top in sequence. The preparation method for the planar room-temperature NH3 sensor comprises the following steps that: firstly, through Suzuki coupled reaction, preparing a TPA-DCPP organic sensitive material; then, through a sputtering method, independently preparing nickel and gold to the Al2O3 ceramic substrate to prepare the interdigital electrode; and then, utilizing a spin-coating method to prepare the TPA-DCPP organic sensitive material on the interdigital electrode. By use of the sensor and the preparation method, the working temperature of the sensor is effectively lowered, the NH3 can bedetected under a room temperature condition, and the ppb(part per billion)-magnitude detection of the NH3 can be realized under high humidity (98%RH (Relative Humidity)). In addition to a high response speed for the NH3 at the room temperature, the sensor disclosed by the invention also has good selectivity and stability.

Description

Technical field [0001] The invention belongs to the technical field of gas sensors, and specifically relates to a flat room temperature ammonia (NH) based on TPA-DCPP organic sensitive film 3 ) The sensor and its preparation method are mainly applied to the detection of ammonia at room temperature. Background technique [0002] Ammonia (NH 3 ) Is a colorless and toxic reducing gas, which is generally produced during construction, interior decoration, farming and livestock breeding, vehicle emissions and other production and living activities, and is affected by environmental factors such as temperature and humidity. The increase in humidity will diffuse a greater concentration of ammonia. With the increasing emissions of ammonia in recent years, it has been recognized as a gas that is very harmful to the living environment and human health. For example, when the concentration in the air reaches 25ppm, NH 3 It can damage the eyes, respiratory tract and other organs. When the conc...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/126
Inventor 刘方猛贺俊铭卢革宇王悦康博南闫旭梁喜双高原刘晓敏
Owner JILIN UNIV
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