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CN-121977615-A - Preparation method of co-structure bimodal respiration sensor based on printing process

CN121977615ACN 121977615 ACN121977615 ACN 121977615ACN-121977615-A

Abstract

The invention discloses a preparation method of a co-structure bimodal respiratory sensor based on a printing process, and aims to solve the problem that an existing respiratory sensor cannot monitor and identify an oral-nasal respiratory mode. The device enables NaCl to be loaded on leather fibers through ultrasonic soaking to form a humidity-sensitive layer. And then sequentially screen printing a G/PEDOT PSS anode and a Zn cathode on the substrate, and coating silver paste on the end points after drying and curing to form a lead area. The sensor responds to temperature changes by utilizing positive electrode resistance and humidity changes by utilizing open circuit voltage between the positive electrode and the negative electrode. Based on the difference of the breath temperature of the mouth and the nose, various breathing modes can be identified in real time and stably, and the accurate distinction between the breath of the mouth and the breath of the nose is realized. The invention has high customizable, and the dual-mode co-structure design of the invention has important significance for the development of wearable and multi-mode sensors, and can be widely applied to the fields of sleep respiratory disease monitoring, respiratory rehabilitation management and the like.

Inventors

  • WU JIANSHENG
  • HUO FENGWEI
  • CHEN LE
  • GU TONG
  • LI WENHAN

Assignees

  • 南京工业大学

Dates

Publication Date
20260505
Application Date
20260112

Claims (11)

  1. 1. The co-structure bimodal respiratory sensor based on the printing process is characterized by comprising 1) preparation of G/PEDOT (power supply system) PSS conductive ink, 2) drying of NaCl-leather under natural conditions by a simple ultrasonic soaking method, and 3) independent output of temperature and humidity signals.
  2. 2. The G/PEDOT/PSS conductive ink is characterized by comprising, by mass, 50% -90% of PEDOT/PSS aqueous dispersion, 1% -10% of graphene, 1% -10% of ethylene glycol, 1% -5% of PU thickener, 0% -1% of cross-linking agent, 0% -1% of defoaming agent and 0% -10% of leveling agent.
  3. 3. The G/PEDOT/PSS conductive ink according to claim 2, wherein the graphene has a 1-2-layer structure, a thickness of 1nm and a granularity of 5-10um.
  4. 4. The G/PEDOT: PSS conductive ink according to claim 2, characterised in that the PU type thickener is at least one of a modified polyether type thickener, a modified alkali-swellable polyurethane and a high shear thickening type.
  5. 5. The leather substrate according to claim 1, wherein the substrate is at least one of cow leather, sheep skin, pig skin, PU leather and non-woven fabric and has a thickness ranging from 0.2mm to 0.8mm.
  6. 6. The NaCl-leather according to claim 1, wherein the cut leather is soaked in NaCl solution with the concentration of 1-5 mol/L, and is placed in an ultrasonic machine for full wetting to reach osmotic balance, and is naturally dried at room temperature after being taken out to form the NaCl-leather electrolyte layer.
  7. 7. The printing process according to claim 1, wherein the printing process comprises at least one of screen printing and ink jet printing.
  8. 8. The screen printing process according to claim 1, wherein the screen is at least one of 200 mesh, 250 mesh, 300 mesh, and the doctor blade is 55 degree pointed.
  9. 9. The screen printing process according to claim 1, wherein the positive electrode printing uses an aqueous screen and the negative electrode printing uses an oily screen.
  10. 10. The interdigital structure according to claim 1, wherein the interdigital index is 2-8 pairs, the finger width is 1-2mm, and the finger pitch is 0.5-1.0mm.
  11. 11. The dual-mode sensor of claim 1, wherein the positive resistance after printing is less than or equal to 200kΩ and the negative resistance is less than or equal to 5kΩ. The resistance change rate of the negative electrode is less than or equal to 0.5 percent in the humidity range of 30-95 percent RH.

Description

Preparation method of co-structure bimodal respiration sensor based on printing process Technical Field The invention relates to the technical field of wearable health monitoring, in particular to a co-structure bimodal respiratory sensor based on a screen printing process and application thereof in the fields of respiratory monitoring, multimodal sensors and the like. Background Respiration is a basic physiological activity that maintains life, and has profound and systemic effects on human health. Oral breathing is often regarded in traditional concepts as a simple compensatory action when nasal breathing is blocked. However, long-term oral breathing is a bad mode, leading to reduced respiratory efficiency, affecting sleep quality, causing oral problems, and leading to craniofacial dysplasia. Therefore, the accurate identification and understanding of the difference between nasal respiration and oral respiration has important scientific significance and application value. Traditional respiratory rate monitoring techniques, such as artificial counting and chest strap sensors, present significant challenges in clinical and home-based scenario applications due to the discretization of the sampling pattern and the inability to continuously capture respiratory dynamics. Conventional devices, represented by polysomnography systems, are not only bulky and complex to operate, but also have limited popularity due to their high cost. In contrast, the wearable respiration sensing technology based on flexible materials and high-frequency sampling can realize continuous dynamic monitoring of respiration, supports multi-mode physiological signal analysis and machine learning auxiliary diagnosis, has obvious advantages in the aspects of cost, comfort and scene adaptability, and provides an innovative solution for respiratory disease management. However, current studies with respiratory monitoring systems rely primarily on sensors to monitor nasal airflow temperature, humidity, or pressure, etc. Such sensors distinguish between oronasal respiration and rely on only a single signal to calculate respiratory rate and determine differences in their breathing patterns based thereon. Since oral and nasal respiration may exhibit highly similar characteristics on the original signal, it is difficult to fundamentally achieve accurate differentiation by only a single signal source. Such limitations may lead to errors in classification of respiratory patterns, particularly under complex physiological or pathological conditions, further affecting the reliability of the data and the accuracy of clinical application. The highly vascularized mucous membrane and the tortuous turbinate structure in the nasal cavity can efficiently realize humidification and heating of inhaled air, and the oral cavity hardly has such tempering function, so that the nasal/oral respiratory airflow has obvious difference in humidity and temperature parameters. In order to greatly improve the accuracy of breath state detection, development of a high-performance breath monitoring sensing system capable of simultaneously sensing the air flow humidity of the oral cavity and the nasal cavity and the temperature change, high sensitivity and good comfort is needed, so that development of medical application such as sleep breath disorder monitoring and breath rehabilitation monitoring is promoted, and the increasing personalized health management requirements are met. Disclosure of Invention The invention aims to provide a co-structure bimodal respiration sensor based on a screen printing process, so as to solve the problem that the conventional respiration sensor is difficult to separate oral and nasal respiration modes from original signals, and solve the problems of complex structure and high manufacturing cost of the multimodal sensor. The specific targets include: 1) Developing a temperature-sensitive sensing material capable of realizing high sensitivity; 2) Developing a humidity sensitive layer suitable for use in a humidity sensor; 3) The design of the multi-mode modal sensor can simplify the structure of the multi-mode modal sensor, and the simple preparation process capable of large-scale preparation and production is adopted. The preparation method of the humidity-sensitive layer comprises the steps of immersing ultrasonic leather in NaCl solution, and naturally drying at room temperature, so that NaCl crystals are successfully loaded in collagen fibers of the leather. The key steps are as follows: 1) Cleaning leather by repeatedly soft-washing substrate material (such as cow leather, sheep leather, PU leather, non-woven fabric, etc.) in clear water and oven drying at 60deg.C; 2) Ultrasonic infiltration, namely transferring the cleaned leather into sodium chloride solution, and placing the leather into an ultrasonic machine at 30 ℃ and 90% of ultrasonic power to fully wet the leather and achieve osmotic balance; 3) And (3) drying, namely finally, cleaning