Preparation Of Strain Sensing Smart Skin Material Based On 3D Printing Technology

With the rapid development of technology,flexible sensors have been widely used in medical monitoring,robotics,human-computer interaction and other fields.In order to detect the interaction between irregular objects and tiny external stimuli,it is necessary to prepare flexible strain sensors with outstanding performance.In general,the main characteristics of the wearable flexible strain sensor are its sensitivity and ability to quickly sense changes in human motion,with excellent stretchability and rapid response.So that it can adapt to any shape,and can accurately transmit electrical signals.However,in the actual application process of the sensor,it will inevitably suffer damage and cause cracks on the surface,thereby destroying the conductive network.In order to further improve the sensitivity of the sensor,compared with the planar structure,the sensor with a three-dimensional structure has a higher sensitivity.Therefore,the development of a wearable "sandwich" sandwich strain sensor is of great significance to maintain its stability and functionality.Based on the above problems,this subject innovatively designed and manufactured a "sandwich" sandwich strain sensor,introduced 3D printing technology,designed and manufactured the middle conductive sensing layer of different shapes and structures,and used high-conductivity(CNT+G)water-based Conductive ink is used as the main conductive interlayer.The interconnection structure is realized by pre-building a "two-layer structure" and embedding copper electrode material in the conductive path,thereby preparing the surface dielectric layer silicone rubber material,thereby passivating the conductive sensing layer,with the ability to protect the strain sensor.In addition,for conductive silicone rubber composites,the conductivity of the filler(MWCNT)and its dispersion in the silicone rubber matrix are important factors that restrict its comprehensive conductivity.When the filling mass fraction of MWCNT is 4wt%,the conductivity and volume resistance of the composite material jump to 10-2s/m and 200?.The flexible electronic skin material encapsulated by carbon nanotubes exhibits sensitive dynamic electrical response,and has good recoverability and repeatability in cyclic loading-compression.The analysis of the value of the wearable strain sensor shows that the current signal value of the sensor with a flat grid-like conductive path attached to it transitions at 7.11×10-3A,showing a regular motion waveform.