Preparation method of ultraviolet-excited nano-cellulose flexible gas sensor

A nanocellulose, gas sensor technology, applied in the field of gas sensors, can solve the problems of poor flexibility of rigid substrates, inability to bend at will, and difficult to degrade substrates, and achieve good light transmission and air permeability, and good signal transmission. The effect of improving function and processing efficiency

A nanocellulose, gas sensor technology, applied in the field of gas sensors, can solve the problems of poor flexibility of rigid substrates, inability to bend at will, and difficult to degrade substrates, and achieve good light transmission and air permeability, and good signal transmission. The effect of improving function and processing efficiency

CN112630181APending Publication Date: 2021-04-09ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Preparation method of ultraviolet-excited nano-cellulose flexible gas sensor
  • Preparation method of ultraviolet-excited nano-cellulose flexible gas sensor
  • Preparation method of ultraviolet-excited nano-cellulose flexible gas sensor

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Effect test

Embodiment 1

[0026] Embodiment 1: A kind of preparation method of the nanocellulose flexible gas sensor excited by ultraviolet light, comprises the following steps:

[0027] S1. Add the semiconductor nanoparticles to the nanocellulose suspension with a concentration of 1.5wt%, and ultrasonically mix for 7 minutes to form a mixed suspension; wherein the mass ratio of the semiconductor nanoparticles in the mixed suspension to the solid content of the nanocellulose is 1:20 , the bandgap range of semiconductor nanoparticles is 3.1eV-6.2eV; the bandgap (Band gap) refers to a bandgap width (unit is electron volts (ev)), the energy of electrons in solids cannot be taken continuously , but some discontinuous energy bands. To conduct electricity, there must be free electrons or holes. The energy band where free electrons exist is called the conduction band (can conduct electricity), and the energy band where free holes exist is called the valence band ( can also conduct electricity); the semiconduc...

Embodiment 2

[0030] Embodiment 2: A kind of preparation method of the nanocellulose flexible gas sensor excited by ultraviolet light, comprises the following steps:

[0031] S1. Add the semiconductor nanoparticles to the nanocellulose suspension with a concentration of 2.5wt%, and ultrasonically mix for 9 minutes to form a mixed suspension; wherein the mass ratio of the semiconductor nanoparticles in the mixed suspension to the solid content of the nanocellulose is 1:60 , the band gap range of semiconductor nanoparticles is 3.1eV-6.2eV; the semiconductor nanoparticles in this embodiment are manganese oxide nanoparticles;

[0032] S2. Use a 0.15 μm microporous membrane for vacuum filtration, first add 2ml of mixed suspension for vacuum filtration to form a layer of nanocellulose film to prevent semiconductor nanoparticles from penetrating the microporous membrane, then add 10ml of mixed suspension The liquid was subjected to vacuum filtration to obtain the intermediate, and then the interme...

Embodiment 3

[0034] Embodiment 3: A kind of preparation method of the nanocellulose flexible gas sensor excited by ultraviolet light, comprises the following steps:

[0035] S1. Add semiconductor nanoparticles to the nanocellulose suspension with a concentration of 2.2 wt%, and ultrasonically mix for 9 minutes to form a mixed suspension; wherein the mass ratio of the semiconductor nanoparticles in the mixed suspension to the solid content of nanocellulose is 1:80 , the band gap range of semiconductor nanoparticles is 3.1eV-6.2eV; the semiconductor nanoparticles in this embodiment are arsenic oxide nanoparticles;

[0036]S2. Use a 0.1 μm microporous filter membrane for vacuum filtration, first add 1.5ml of mixed suspension for vacuum filtration to form a layer of nanocellulose film to prevent semiconductor nanoparticles from penetrating the microporous filter membrane, then add 15ml of mixed suspension The suspension was vacuum filtered to obtain the intermediate, and then the intermediate ...

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Abstract

The invention discloses a preparation method of an ultraviolet-excited nanocellulose flexible gas sensor, and the method comprises the following steps: S1, adding semiconductor nanoparticles into a nanocellulose suspension, and carrying out ultrasonic mixing for 5-10min to form a mixed suspension, wherein the mass ratio of the solid content of the semiconductor nanoparticles to the solid content of the nanocellulose in the mixed suspension is 1: 10-100, and the forbidden band width range of the semiconductor nanoparticles is 3.1 eV-6.2 eV; S2, carrying out vacuum filtration by adopting a 0.05-0.2 [mu]m microporous filter membrane, firstly adding 0.5-2 part of the mixed suspension for vacuum filtration, then adding 10-20 parts of the mixed suspension for vacuum filtration to obtain an intermediate, and then putting the intermediate into a drying oven for pressurizing and drying at 50-70 DEG C for 2-5 hours to obtain a nano composite membrane; S3, preparing a gold material into an interdigital electrode on the surface of the nano composite film by using a vacuum ion sputtering method, and introducing a pin to prepare the gas sensitive sensor. According to the invention, an integrated flexible nano composite film can be formed, the performance of the gas sensor is ensured, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of gas-sensitive sensors, in particular to a method for preparing a nano-cellulose flexible gas-sensitive sensor excited by ultraviolet light. Background technique [0002] With the rapid development of science and technology, people's living standards have been significantly improved. The ensuing air pollution problem has caused huge threats and harm to people's lives, and the development of smart wearable technology has also increased people's demand for wearable gas sensors. [0003] The currently used MEMS process manufacturing method leads to a large size of the gas sensor. Moreover, the flexibility of traditional rigid substrates is relatively poor, and it cannot be bent at will. Generally, the assembly process of the gas sensor is to process the electrode on the surface of the base material, and then add the gas sensitive material, which is a cumbersome process. At the same time, the traditional ga...

Claims

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Application Information

Patent Timeline
09 Apr 2021
Publication
CN112630181A
IPC
G01N21/33
CPC
G01N21/33
Inventors
童欣; 任海波