CN-121994282-A - Multimode flexible sensor with pressure-proximity-magnetic field sensing and method of making same

Abstract

The application provides a multimode flexible sensor with pressure-proximity-magnetic field sensing and a preparation method thereof, and belongs to the technical field of flexible sensors. The application prepares a mould containing an inclined columnar hole array, pours magnetic suspension into the mould, places a first fabric on the top of the mould, integrates the magnetic inclined micro-column array on the front surface of the first fabric after the magnetic suspension is solidified, loads a first conductive layer on the back surface of the first fabric, and prepares an integrated fabric electrode. The multimode flexible sensor can realize continuous and uninterrupted interaction, does not overlap output signals of proximity sensing, pressure sensing and magnetic field sensing, is easy to distinguish, and has good application prospects in the fields of medical health detection, man-machine interaction, electronic skin and the like.

Inventors

• WANG DONG
• LIU QIONGZHEN
• SONG MENGYA
• XU XIAO
• LU YING
• WANG BO
• LI MUFANG

Assignees

• 武汉纺织大学

Dates

Publication Date

20260508

Application Date

20241101

Claims (10)

1. 1. A method of manufacturing a multimode flexible sensor with pressure-proximity-magnetic field sensing, comprising the steps of: s1, preparing a die containing an inclined columnar hole array; S2, mixing magnetic particles and an elastic polymer to prepare a magnetic suspension, pouring the magnetic suspension into a mold, placing a first fabric on the top of the mold, enabling the first fabric to be in contact with the magnetic suspension, and demolding after the magnetic suspension is solidified to obtain a magnetic inclined micro-column array fabric; s3, arranging a first conductive layer on the back surface of the magnetic inclined micro-column array fabric to obtain an integrated fabric electrode; S4, arranging a second conductive layer on the front surface of the second fabric to obtain a second fabric electrode, and butt-jointing and assembling the integrated fabric electrode and the front surface of the second fabric electrode to obtain the multimode flexible sensor with pressure-proximity-magnetic field sensing.
2. 2. The method for manufacturing a multimode flexible sensor with pressure-proximity-magnetic field sensing according to claim 1, characterized in that in step S1, the inclination angle of the columnar holes in the inclined columnar hole array with respect to the vertical direction is 10-60 °.
3. 3. The method for manufacturing the multimode flexible sensor with pressure-proximity-magnetic field sensing according to claim 1, wherein the length of the magnetic inclined micro-pillars in the magnetic inclined micro-pillar array fabric is 2-3.5 mm, the diameter is 500-1000 μm, and the distribution density is 9-36 pieces/cm 2 .
4. 4. The method for manufacturing a multimode flexible sensor with pressure-proximity-magnetic field sensing according to claim 1, characterized in that in step S2, the mass ratio of the magnetic particles to the elastic polymer is 1-3:1.
5. 5. The method of claim 1, wherein the magnetic particles comprise one or more of neodymium-iron-boron particles, magnetic nickel particles, magnetic carbonyl iron particles, and ferroferric oxide particles.
6. 6. The method of manufacturing a multimode flexible sensor with pressure-proximity-magnetic field sensing of claim 1, wherein the elastic polymer comprises one or more of polydimethylsiloxane, polydiethylsiloxane, urethane acrylate, silicone rubber.
7. 7. The method of claim 1, wherein the first fabric and the second fabric are woven or nonwoven fabrics, and the woven fabrics comprise one of PET fabric, spandex fabric, nylon fabric, cotton fabric, nylon fabric, and linen.
8. 8. The method for manufacturing a multimode flexible sensor with pressure-proximity-magnetic field sensing according to claim 1, wherein the first conductive layer and the second conductive layer are formed by drying conductive silver paste, and the conductive silver paste is loaded by printing or coating.
9. 9. The method of manufacturing a multimode flexible sensor with pressure-proximity-magnetic field sensing according to claim 1, wherein the first conductive layer and the second conductive layer are connected to wires, respectively, when the multimode flexible sensor is assembled.
10. 10. The multimode flexible sensor with the pressure-proximity-magnetic field sensing function is characterized by being prepared by adopting the preparation method of any one of claims 1-9 and comprising an integrated fabric electrode and a second fabric electrode which are oppositely arranged, wherein the integrated fabric electrode comprises a first fabric, a magnetic inclined micro-column array arranged on one side of the first fabric and a conductive layer arranged on the other side of the first fabric, and the magnetic inclined micro-column array serves as a dielectric layer between the first fabric and the second fabric electrode.

Description

Multimode flexible sensor with pressure-proximity-magnetic field sensing and method of making same Technical Field The invention relates to the technical field of flexible sensors, in particular to a multimode flexible sensor with pressure-proximity-magnetic field sensing and a preparation method thereof. Background The human skin is composed of epidermis, dermis and subcutaneous tissue, and is a protective barrier for our body. Hair grows from the hair follicle, penetrates the epidermis, and transmits external physical signals to the brain through mechanoreceptors and sensory nerves. In light of the above, scientists develop flexible touch sensors to simulate the touch of human skin, convert external stimuli such as pressure, bending, stretching and the like into electric signals, and are widely applied to the fields of health monitoring, intelligent medical treatment, intelligent artificial limbs, bionic robots, augmented reality and the like. The working modes of the sensor are divided into a contact type and a non-contact type. Touch sensors acquire real-time data of physiological monitoring through direct physical contact, such as compression or stretching. The non-contact sensor can detect environmental signals such as electromagnetic fields, temperature changes or the proximity of objects, and convert the signals into electrical signals, so that interaction without physical contact is realized, which is particularly important for preventing virus propagation. Therefore, developing a multi-modal flexible sensor capable of simultaneously sensing a compressive touch and a proximity signal is critical to building an intuitive and extensible human-computer interaction platform. The development of such sensors has become particularly urgent as the demand for wearability, precise manipulation and versatility has increased. In the prior art, a patent with publication number CN107036657A provides a preparation method of a magnetic and force cilia bionic sensor. The patent is characterized in that a suspension formed by a resin material and magnetic particles is placed in a magnetic field environment, heating treatment is carried out until a solvent volatilizes, the resin is solidified, a magnetic fiber array is obtained, graphene oxide is coated on the surface of the obtained magnetic fiber array, a magnetic conductive fiber array is obtained after chemical reduction treatment, and finally the magnetic conductive fiber array is used as a signal sensitive layer and combined with an electrode layer to be used as a sensor for responding to magnetic signals and force signals. However, the resin substrates in the electrode layer and the signal sensitive layer are both airtight high polymer materials, skin discomfort can be caused by long-term wearing, application of the sensor is limited, meanwhile, the magnetic cilia manufactured by the magnetic field induction method in the patent are irregular in shape, the growth height, the diameter and the angle are difficult to accurately control, the whole preparation method is complicated, consistency and repeatability of the sensor are influenced, the sensing effect of the sensor is also influenced, and in addition, the sensor provided by the patent can only sense pressure and magnetic field, can not sense a close signal, and is difficult to meet the development requirement of the multimode sensor. In view of the foregoing, there is a need for an improved multimode flexible sensor with pressure-proximity-magnetic field sensing and method of manufacture that addresses the above-described problems. Disclosure of Invention In view of the technical problems in the background art, the application provides a multimode flexible sensor with pressure-proximity-magnetic field sensing and a preparation method thereof, and aims to solve the technical problems of single function and poor sensing effect of the traditional sensor. In a first aspect, an embodiment of the present application provides a method for manufacturing a multimode flexible sensor with pressure-proximity-magnetic field sensing, including the steps of: s1, preparing a die containing an inclined columnar hole array; S2, mixing magnetic particles and an elastic polymer to prepare a magnetic suspension, pouring the magnetic suspension into a mold, placing a first fabric on the top of the mold, enabling the first fabric to be in contact with the magnetic suspension, and demolding after the magnetic suspension is solidified to obtain a magnetic inclined micro-column array fabric; s3, arranging a first conductive layer on the back surface of the magnetic inclined micro-column array fabric to obtain an integrated fabric electrode; S4, arranging a second conductive layer on the front surface of the second fabric to obtain a second fabric electrode, and butt-jointing and assembling the integrated fabric electrode and the front surface of the second fabric electrode to obtain the multimode flexible sensor with pressure-proxi