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Fused ring squaramide polymer, humidity sensor based on fused ring squaramide polymer and preparation method thereof

A technology of humidity sensitive sensor and square amide, which is applied in the field of organic semiconductor materials, can solve problems such as poor reproducibility and interchangeability, high temperature coefficient of resistance, and damage to humidity sensing performance, achieving short response time, short recovery time, and convenient preparation Effect

Active Publication Date: 2021-12-10
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the electrolyte salt in the electrolyte material is easy to absorb water and be diluted, or even flow out, which destroys the moisture-sensing performance of the material; although ceramics and porous metal materials have excellent heat resistance and respond quickly to humidity, their temperature coefficient of resistance is relatively low. High, poor reproducibility and interchangeability, and not resistant to contamination

Method used

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  • Fused ring squaramide polymer, humidity sensor based on fused ring squaramide polymer and preparation method thereof
  • Fused ring squaramide polymer, humidity sensor based on fused ring squaramide polymer and preparation method thereof
  • Fused ring squaramide polymer, humidity sensor based on fused ring squaramide polymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Synthesis of Polymer 1,5-PDAS and Preparation of Sensors

[0042] (1) Synthesis of polymer 1,5-PDAS:

[0043]

[0044] Weigh 1,5-diaminoanthraquinone (238.25 mg, 2 mmol) and squaraine (114.06 mg, 2 mmol), and place in n-butanol (50 mL), heat at 130°C and reflux for 18 h, react After the end, when the temperature dropped to room temperature, the product was filtered, washed with tetrahydrofuran and acetone, and dried to obtain the square amide polymer 1, 5 - PDAS. 1, 5 – The IR spectrum of PDAS as figure 2 As shown, the molecular weight is 12000~16000.

[0045] Depend on figure 2 It can be seen that after the polymerization reaction is completed, the characteristic peak of hydroxyl in squaraine disappears, the characteristic peak of C=O double bond remains, and the peak position of the characteristic peak of C-N bond has a certain migration due to the change of charge density, indicating that the polymerization 1,5-PDAS.

[0046] (2) Preparation of t...

Embodiment 2

[0051]Example 2: Measurement experiment of humidity sensor's impedance response to humidity at different frequencies

[0052] The device prepared in Example 1 is placed in the testing machine, the frequency is adjusted in the range of 10 Hz to 100 kHz, and the device is tested at different relative humidity levels such as 11%, 33%, 54%, 75%, 85%, 95%. Impedance changes in the atmosphere, as a result of image 3 shown.

[0053] from image 3 It can be seen from the figure that for different concentrations of humidity atmosphere, the humidity sensor based on square amide polymer 1, 5-PDAS has different impedance changes under different frequency conditions. powerful.

Embodiment 3

[0054] Embodiment 3: The recovery performance measurement experiment of humidity sensor under the relative humidity between 11% and 95%

[0055] Under the condition of frequency of 100 Hz, first place the device under the condition of 11% relative humidity, after the impedance is stable, then place the device under the condition of 95% relative humidity, and after the impedance is stable, place the device again Under the condition of 11% relative humidity, repeat the above cycle, the result is as follows Figure 4 shown.

[0056] For humidity sensors based on squaramide polymer 1, 5-PDAS, from Figure 4 It can be found that the stability of the device is very good; from Figure 5 It can be found that the device test response time is as short as less than 2 s; from Figure 6 It can be found that the recovery time of the device is as short as less than 1 s. It can be seen that the device not only has good stability, but also has short response time and short recovery time. ...

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Abstract

The invention discloses a condensed ring squaramide polymer, a humidity sensor based on a condensed ring squaramide polymer and a preparation method thereof, specifically, the humidity sensor of the present invention comprises an interdigital electrode and a coating film covering the surface of the interdigital electrode Material, the coating material is fused ring polymer 1,5‑PDAS, which is brushed on the interdigitated electrodes. The humidity sensitive sensor of the present invention has the following advantages: convenient preparation and simple operation; short response time, less than 2 seconds; short recovery time, less than 1 second; stable device performance; in high humidity environment, the humidity hysteresis of the device is small, 6% .

Description

technical field [0001] The invention belongs to the technical field of organic semiconductor materials, and in particular relates to two humidity-sensitive sensors based on fused-ring squaramide polymers, a preparation method thereof, and an application thereof in air humidity detection. Background technique [0002] With the development of science and technology, many fields have more stringent requirements on environmental humidity, such as aerospace industry, agriculture, precision machinery and laboratories, all need to effectively monitor the environmental humidity. The core of the humidity sensor is the humidity sensor, which uses the adsorption of the humidity-sensitive material to directly absorb water molecules, so that the surface conductance, volume, dielectric constant and other humidity-sensing characteristic quantities change, and after the detection and conversion of the changing circuit, the output electrical signal to detect humidity. Currently known moistu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/121G01N27/126
Inventor 路建美贺竞辉
Owner SUZHOU UNIV
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