Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A capacitive silk protein humidity sensor and preparation method thereof

A humidity sensor and silk protein technology, applied in the direction of material capacitance, etc., can solve the problems of process-limited device integration, low sensitivity, complex circuit, etc., and achieve good humidity response effect, high material utilization rate, and good biocompatibility Effect

Active Publication Date: 2021-07-13
XI AN JIAOTONG UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Respiratory monitors based on chest wall deformation are generally large in size and complex in circuit, so the relative manufacturing cost is relatively high, and it is very uncomfortable to wear; the humidity sensor that uses the humidity of the exhaled gas to monitor the respiratory rate can be divided into resistive type humidity sensor and Capacitive humidity sensor, resistive humidity sensor usually responds slowly, has low sensitivity and the measurement data is greatly affected by temperature changes; It affects the capacitance value, has the advantages of fast response speed, high sensitivity, and work is not affected by temperature changes. The commonly used moisture-sensing layer materials are usually polyimide, polytetrafluoroethylene, polypyrrole, etc., which are non-biocompatible or difficult to degrade Polymers are not conducive to the application in the field of human wearable devices
In addition, it is difficult for the existing respiratory monitors to realize comprehensive monitoring of respiratory intensity and frequency. The conventional capacitive respiratory monitoring sensor manufacturing process usually requires the integration of vacuum coating process, solution method film forming process, annealing process, etc. The complex process limits the device. Prospects for integration and large-area high-efficiency manufacturing

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A capacitive silk protein humidity sensor and preparation method thereof
  • A capacitive silk protein humidity sensor and preparation method thereof
  • A capacitive silk protein humidity sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] refer to figure 1 , the preparation method of the capacitive silk protein humidity sensor of the present invention comprises the following steps:

[0029] 1) On the substrate 11, the silver nanowire film 12 and the photoresist film 13 are sequentially scraped and coated on the substrate 11, and then a mask pattern covering the interdigitated electrode area is prepared by a photolithography process to obtain a patterned substrate 11;

[0030] 2) Treating the patterned substrate 11 obtained in step 1) with plasma oxygen to oxidize and insulate the non-electrode region, and then remove the glue to obtain a conductive interdigitated electrode region and an insulating non-electrode region;

[0031] 3) Scrape the silk protein solution on the conductive interdigitated electrode area and the insulating non-electrode area by scraper coating, air-dry to obtain the silk protein moisture-sensitive film 17, and then place it in an anhydrous ethanol solution to treat the silk protei...

Embodiment 1

[0034] The preparation method of the capacitive silk protein humidity sensor of the present invention comprises the following steps:

[0035] 1) Select flexible substrates, such as dielectric polymers such as polyethylene terephthalate (PET), polyimide (PI) or polyvinylidene fluoride (PVDF), or inorganic substrates such as glass and silicon wafers. For the dielectric material, PET plastic with a thickness of 300 μm is used in this embodiment, and the substrate is ultrasonically cleaned with ethanol and deionized water for 10 minutes, and then dried with an infrared lamp to obtain the substrate 11;

[0036] 2) Scrape-coat the silver nanowire film 12 on the substrate 11 using a doctor blade coater, the distance between the scraper and the substrate 11 is 200 μm, and the scraping speed is 15 mm / min, and the silver nanowire solution used is a dispersion system with deionized water, And the concentration is 10mg / ml, the diameter of silver nanowires is about 100nm, and the length is...

Embodiment 2

[0044] The preparation method of the capacitive silk protein humidity sensor of the present invention comprises the following steps:

[0045] 1) A polyethylene terephthalate film with a size of 10cm×10cm was ultrasonically cleaned with ethanol and deionized water for 10 minutes, and then dried with an infrared lamp to obtain the substrate 11;

[0046] 2) Use a knife coater to evenly coat a layer of silver nanowire thin film 12 on the substrate 11. Specifically, 10 wt % silver nanowire dispersion liquid with a diameter of 50 nm is dropped on the scraper. 15 mm / s, and the height of the scraper is 200 μm, so that the silver nanowire dispersion is evenly coated on the substrate 11. After the scraping is completed, the sample is placed on a heating table at 120° C. for half an hour for heating and curing, and then cooled to room temperature to obtain silver. nanowire film 12;

[0047] 3) Use a scraper coater to uniformly coat a layer of photoresist on the substrate 11 obtained in ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a capacitive silk protein humidity sensor and a preparation method thereof, which comprises a silk protein moisture-sensing layer, silver nanowire interdigitated electrodes and a substrate distributed sequentially from top to bottom. The sensor has a high resistance to humidity changes. Sensitivity and fast response time, and can be directly attached under the nose to monitor the human respiratory rate and intensity at the same time.

Description

technical field [0001] The invention relates to a humidity sensor and a preparation method thereof, in particular to a capacitive silk protein humidity sensor and a preparation method thereof. Background technique [0002] Wearable sensors can provide real-time and accurate vital sign monitoring information, which is the development trend of a new generation of medical devices. Wearable breathing monitoring devices could aid in the diagnosis and ongoing treatment of a large number of people suffering from neurological, cardiovascular and pulmonary conditions such as seizures, high blood pressure, malformations and asthma. Existing wearable respiratory monitoring devices mainly include chest-worn type based on chest wall movement and face-worn type based on local humidity changes caused by exhaled gas. [0003] Respiratory monitors based on chest wall deformation are generally large in size and complex in circuit, so the relative manufacturing cost is relatively high, and it...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/22
Inventor 罗钰裴跃琛冯学明张浩王莉
Owner XI AN JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com