Research Of Press Sensor Based On Printing Technology

Smart life connects all kinds of things in life together.There has become an indisputable fact with the tremendous growth of the Internet of things and the rapid rise of a series of new lifestyles such as smart homes and wearable devices.There is increasing demand for people on flexible electronics products,but there are still shortcomings in general.In this thesis experiment,the micro-nano structured pressure sensor was fabricated by learning the process of making lithographic plates in lithographic printing.As a result,a micro-nano structure with controllable and simple operation was obtained with a simple process and low cost.This method complements the micro-nano sensor technology research method.Meanwhile,the method has important research and application value for the manufacture of large-area industrial flexible pressure sensors.In this thesis,the change of the resistance is achieved by changing the contact area of two conductive layers to accomplish the detection function of the device.The whole process mainly consists of the construction on micro-nano layers and conductive layers and the measurement of the final device.The micro-nano layer is exposed and developed by the composition of a micro-nano patterned film and a polyacrylonitrile(PAN)film,to obtain a cured photosensitive film with micro-nano structures on the film.The unprotected areas were semi-fused with N-N dimethylformamide(DMF)which is capable of dissolving a thin film,and then subjected to ultrasonic treatment.As a result,the cured photosensitive was removed to obtain a film with a concave-convex structure.Meanwhile,the multi-walled carbon nanotubes are attached to the micro-nano structured film as the conductive layer by a liquid phase method.The device is assembled by two opposites of the same composite layer.It's the mainly research about the micro-nano layer to explore the optimal formation conditions and the detection of micro-and nano-structures with different micro-nano shapes and different micro-nano cell spacings.When the drying time is over 150s,the exposure time is 90-120s,and the developing time is 70s,the cured photoresist can be formed with complete morphology.In the compression experiment,the linear compression amount is the smallest and the diamond shape is the largest in the same micro-nano spacing.For different micro-nano spacings,with the increasing of the micro-nano spacing,the amount of compression increases.It's the mainly research about conductive layer to explore the optimal initial concentration of MWCNTs,the treatment method,the number of adhesion layers and the transparency of the attached device.The initial concentration of 0.4mg/ml,the centrifugation speed of 2000r/min,and the best experimental conditions for the current use,for the different number adhesion layers of the conductive layer,the sheet resistance decreases with the increase of the adhesion layers,however,the transmittance decreases as the number of attached layers increases.The device measurements show that when the micro-nano shape is diamond-shaped and the micro-nano cell spacing is 90 micrometers,it has the best sensitivity,and its low-pressure zone sensitivity is 0.458kPa-1,and the high-pressure zone is 0.033kPa-1.The response time of the device is 0.032s,while the transmittance for the final molded device is about 60%.