CN-121994877-A - Flexible wireless humidity respiration sensor based on ultrahigh frequency and preparation method thereof

Abstract

The invention discloses a flexible wireless humidity respiration sensor based on ultrahigh frequency and a preparation method and application thereof, comprising the following steps of providing a flexible tag antenna with an RFID chip; and instilling the mixed solution of Ti 3 C 2 T x MXene and GO into the fenestration holes of the second fenestration mask plate and the first fenestration mask plate, and drying to obtain the ultrahigh-frequency-based flexible wireless humidity respiration sensor. The invention adopts the MXene and GO mixed humidity-sensitive sensing material, improves the response capability of resistance change and enhances the sensitivity of the humidity respiration sensor, and simultaneously adopts the ultra-high frequency tag antenna to realize the purpose of long-distance wireless passive humidity-sensitive sensing.

Inventors

• NIE BAOQING
• ZHAO CHENBIN
• ZHANG JIAQI
• WU DONGLIN

Assignees

• 苏州大学

Dates

Publication Date

20260508

Application Date

20251226

Claims (10)

1. 1. The preparation method of the flexible wireless humidity respiration sensor based on the ultrahigh frequency is characterized by comprising the following steps of: s1, providing a flexible tag antenna with an RFID chip; S2, attaching a first windowing mask plate to the tag antenna, removing an aluminum layer below the windowing position of the first windowing mask plate through mechanical scraping, attaching a second windowing mask plate, and enabling the windowing holes of the second windowing mask plate to be opposite to the windowing holes of the first windowing mask plate; S3, instilling the mixed solution of Ti 3 C 2 T x MXene and GO into the opening holes of the second opening mask plate and the first opening mask plate, and drying to obtain the ultrahigh frequency-based flexible wireless humidity respiration sensor serving as a humidity-sensitive sensing material.
2. 2. The preparation method of the ultrahigh-frequency-based flexible wireless humidity respiration sensor is characterized by comprising the steps of mixing Ti 3 C 2 T x MXene solution and GO solution, performing ultrasonic dispersion, and stirring by a vortex mixer.
3. 3. The method for manufacturing the ultrahigh frequency-based flexible wireless humidity respiration sensor according to claim 1, wherein the mass ratio of Ti 3 C 2 T x MXene to GO in the mixed solution of Ti 3 C 2 T x MXene and GO is (4-6): 1.
4. 4. The method for manufacturing an ultrahigh frequency-based flexible wireless humidity respiration sensor according to claim 1, wherein the tag antenna is selected from a dipole microstrip patch antenna or a circularly polarized microstrip patch antenna.
5. 5. The method for manufacturing a flexible ultra-high frequency based wireless humidity respiration sensor according to claim 4, wherein the sensing material is placed at the feeding point of the low frequency resonant loop of the tag antenna and is located at the corner of the square resonant loop.
6. 6. The method for manufacturing the ultrahigh frequency-based flexible wireless humidity respiration sensor according to claim 1, wherein the central axes of the fenestration holes of the second fenestration mask plate and the fenestration holes of the first fenestration mask plate coincide, and the fenestration area of the second fenestration mask plate is larger than that of the fenestration hole of the first fenestration mask plate.
7. 7. An ultrahigh frequency-based flexible wireless humidity respiration sensor prepared by the preparation method according to any one of claims 1 to 6, comprising a flexible tag antenna, a sensing material attached to the tag antenna, and an RFID chip.
8. 8. The ultra-high frequency based flexible wireless humidity respiration sensor of claim 7, wherein the sensing material comprises Ti 3 C 2 T x MXene and GO.
9. 9. An RFID wireless sensing system comprising an RFID reader, a reader antenna, the ultra-high frequency based flexible wireless humidity respiration sensor of any of claims 7-8, and a host computer.
10. 10. The working method of the RFID wireless sensing system according to claim 9, wherein when the flexible wireless humidity respiration sensor enters a magnetic field generated by a reader antenna controlled by an RFID reader, the flexible wireless humidity respiration sensor receives radio frequency signals sent by the reader antenna, the flexible wireless humidity respiration sensor acquires energy and wakes an RFID chip in the flexible wireless humidity respiration sensor by virtue of induction current generated by the radio frequency signals, relevant information in the RFID chip is backscattered, then the RFID reader reads and decodes the relevant information, and finally the information is sent to an upper computer for data processing.

Description

Flexible wireless humidity respiration sensor based on ultrahigh frequency and preparation method thereof Technical Field The invention relates to the technical field of sensors, in particular to a flexible wireless humidity respiration sensor based on ultrahigh frequency and a preparation method thereof. Background With the rapid rise of modern technological level, information acquisition, transmission and processing technologies have become an integral part of social production and living activities. The flexible wireless sensor has unique advantages in wearable health monitoring projects by virtue of excellent mechanical flexibility, extensibility and lightweight characteristics, and overcomes the defects of the traditional wired sensor in engineering. The flexible humidity sensor can sense the ambient humidity and convert the ambient humidity into a measurable electrical signal, so that the non-sensing and continuous monitoring of the health and the ambient state of a human body are realized. There are many flexible sensing principles to detect humidity, including traditional inorganic materials such as metal oxides, which are stable but have poor flexibility and often require complex use with flexible substrates. In addition, graphene oxide GO has excellent humidity sensitivity due to rich hydrophilic functional groups, is commonly used for manufacturing humidity sensors, but has the problems of instable structure, slower response speed and the like, the functional groups on the surface of the GO are difficult to quickly separate from water molecules when the humidity is reduced after being combined with the water molecules, meanwhile, the chemical properties of the GO are not very instable, the GO can be slowly chemically degraded in a water-oxygen environment, and the long-term stability is poor. The excellent electrical conductivity and mechanical flexibility of the carbon nanomaterial, such as graphene and carbon nanotube, greatly improve the sensitivity and response speed, but have the disadvantages of high cost and high manufacturing difficulty. The current main stream is molecular polymer materials and composite multifunctional materials, and the characteristics of high sensitivity, wide-range detection, self energy supply and the like can be simultaneously realized by compounding different materials and synergistically increasing the efficiency. For example, ti 3C2Tx MXene is used as a sensing material of the humidity sensor, the surface of the sensing material is provided with rich functional groups (such as-OH, -O, -F and the like), and the functional groups interact with water molecules, so that the conductivity of the MXene is changed, and the adsorption of moisture increases the migration and transmission of electrons on the surface of the material, so that the resistance of the MXene is changed. Humidity detection can be achieved by measuring the resistance change of MXene under different humidity conditions. The prior report discloses that the humidity sensor manufactured by using the MXene/silver nanowire has higher response speed (5 s) and better deformability, but the recovery time is as long as 80s, and the response rate is 3%. In the humidity sensing technology, the mode of acquiring the sensor information is a wired mode, namely, the sensor signal extraction needs a wire to be connected to a signal conditioning circuit and sent to an upper computer. However, in the field of wearable health detection, the wired mode limits the activity of the wearer, and cannot accurately restore the relevant information of the user in the real life environment state. Disclosure of Invention Aiming at the defects in the prior art, the invention provides the ultrahigh frequency-based flexible wireless humidity respiration sensor and the preparation method thereof, which adopt Ti 3C2Tx MXene and GO mixed sensing materials to improve the response capability of resistance change and enhance the sensitivity of the humidity respiration sensor, and the introduction of GO enhances the hydrogen bonding effect of Ti 3C2Tx MXene and water molecules to further enhance the conductivity change of the materials, and meanwhile, the ultrahigh frequency-based tag antenna realizes the purpose of wireless passive humidity sensing and enhances the reliability of the sensor in the use process. In order to solve the technical problems, the first aspect of the invention provides a preparation method of a flexible wireless humidity respiration sensor based on ultrahigh frequency, which comprises the following steps: s1, providing a flexible tag antenna with an RFID chip; S2, attaching a first windowing mask plate to the tag antenna, removing an aluminum layer below the windowing position of the first windowing mask plate through mechanical scraping, attaching a second windowing mask plate, and enabling the windowing holes of the second windowing mask plate to be opposite to the windowing holes of the first windowing mask