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

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...

AI Technical Summary

Problems solved by technology

[0003] The MEMS process manufacturing method currently used 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

The assembly process of the general gas sensor is to process the electrode on the surface of the base material, and then add the gas sensitive material, the process is cumbersome

At the same time, the traditional gas sensor needs to be heated to 300°C to 500°C before it can be used normally, which makes it inconvenient to wear

In addition, traditional gas sensor substrates are generally difficult to degrade, and a large amount of waste will accumulate in the long run, which will cause huge pollution to the environment

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