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Ion-conductive nano-cellulose-based capacitive humidity sensor and preparation method thereof

A nano-cellulose and humidity sensor technology, applied in the direction of material capacitance, instruments, scientific instruments, etc., can solve the problems that the dielectric layer cannot be directly applied and the surface roughness is high, and achieve miniaturization, good biological safety, and wide-ranging sources Effect

Pending Publication Date: 2020-12-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the shortcomings of paper-based materials such as high surface roughness, it cannot be directly applied as a dielectric layer of the material.

Method used

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  • Ion-conductive nano-cellulose-based capacitive humidity sensor and preparation method thereof
  • Ion-conductive nano-cellulose-based capacitive humidity sensor and preparation method thereof
  • Ion-conductive nano-cellulose-based capacitive humidity sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this embodiment, the substrate 1 is a glass sheet, the electrode 2 is produced by vacuum thermal evaporation physical vapor deposition method, the nanocellulose solution is prepared by TEMPO oxidation method, and the nanocellulose-based thin film layer is prepared by drip coating with a pipette gun.

[0039]Step 1, adopt wood pulp to prepare nanocellulose solution, specifically as follows:

[0040] In step 1-1, 100 mg of TEMPO (2,2,6,6-tetramethylpiperidine oxide) reagent was ultrasonically treated for 20 minutes, and then uniformly dissolved in 95 mL of deionized water to form a TEMPO aqueous solution;

[0041] Step 1-2, uniformly dissolve 659mg of sodium bromide solution in 65mL of deionized water, and uniformly mix with TEMPO aqueous solution, then mechanically stir 6.5g of softwood pulp in 80mL of deionized water to form a pulp suspension, then, add sodium bromide Add 38mL of the mixed aqueous solution with TEMPO and 12wt% sodium hypochlorite solution to the cork...

Embodiment 2

[0054] The material, preparation method and preparation process used in this embodiment are the same as those in the first embodiment, and the purpose is to detect the monitoring of the small humidity difference by the sensor, and the capacitance change is used as the output signal.

[0055] Figure 4 The ion-conductive nanocellulose-based capacitive humidity sensor prepared by this technology is based on the response test chart of capacitance change to humidity of 60% and 61%.

[0056] The test process is as follows: fix the ion-conductive nanocellulose-based capacitive humidity sensor in an environment with a humidity of 60%, connect the source electrode and the drain electrode through a wire, and connect the sensor to a TH2827C LCR meter through a wire, and adjust the test After the device works, test the capacitive output signal of the sensor, and use the capacitive output signal as an electrical signal, and record the output characteristics of the sensor after the capacit...

Embodiment 3

[0060] The material, preparation method and preparation process used in this embodiment are the same as those in the first embodiment, and the purpose is to test the schematic diagram of the response of capacitance with frequency under different humidity conditions.

[0061] Figure 5 The capacitive response of the ion-conducting nanocellulose-based capacitive humidity sensor prepared by this technology to different frequencies under different humidity is shown in this example.

[0062] The test process is as follows: fix the ion-conductive nanocellulose-based capacitive humidity sensors in closed chambers with humidity of 7%, 24%, 47%, 61%, 75%, 83%, and 94%, respectively, and wire the sensors to Connect with TH2827C type LCR meter testing instrument. After adjusting the test device to work, cover the lid of the cavity, test the capacitance signal of the sensor, and use the capacitance signal as an electrical signal. After the signal is stable, record the change of the capa...

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Abstract

The invention provides a preparation method of an ion-conductive nano-cellulose-based capacitive humidity sensor. The preparation method comprises the steps of 1 preparing a nanocellulose solution forlater use; 2 manufacturing a substrate; 3 sequentially carrying out ultrasonic cleaning on the substrate by adopting acetone and isopropanol, then washing the substrate by adopting ethanol and deionized water, and finally blow-drying the surface of the substrate by using nitrogen to obtain a treated substrate; 4 shielding the top of the treated substrate by using a mask, and evaporating a metal conductive material to the upper surface of the treated substrate in a vacuum evaporator to obtain an electrode; and 5 dispensing the nano-cellulose solution on the surface of the finger part of the electrode by adopting a dispensing method, and then heating to remove moisture to obtain a nano-cellulose-based thin film layer, thereby obtaining the ion-conductive nano-cellulose-based capacitive humidity sensor. The invention further provides the ion-conductive nano-cellulose-based capacitive humidity sensor. The ion-conductive nano-cellulose-based capacitive humidity sensor comprises the substrate, the electrode and the nano-cellulose-based thin film layer.

Description

technical field [0001] The invention belongs to the field of humidity sensors, and in particular relates to an ion-conductive nanocellulose-based capacitive humidity sensor and a preparation method thereof. Background technique [0002] The monitoring of humidity plays a vital role in human production and life. The development of humidity sensors with excellent performance is particularly important in various fields such as industrial and agricultural production, meteorological monitoring, environmental protection, and human settlement monitoring. In practical applications, in order to better detect humidity, the corresponding detection devices must have the characteristics of high sensitivity, good selectivity, suitable cost performance, low power consumption, portable size, and good compatibility. [0003] Among many types of humidity sensors, the sensor that determines the humidity of the gas by using the electrical properties of the material and showing a certain relati...

Claims

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Application Information

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IPC IPC(8): G01N27/22
CPCG01N27/225G01N27/226
Inventor 黄佳侯世杰王言
Owner TONGJI UNIV
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