Research On Aerosol Jet Printing Technology For Woven Object Sensing Device

In recent years,smart devices have been constantly updated and iterated with new features,which have attracted the curiosity of the public.Among them,wearable electronic devices,as an important branch of intelligent devices,will have a larger market space in the future.With the continuous development and progress of wearable technology,its application fields will be more extensive,such as health monitoring,human-computer interaction and so on.In this context,aerosol printing technology uses ultrasonic and nitrogen as an energy source for noncontact surface treatment and direct deposition of particles on the material to form a coating.Compared with traditional inkjet or corona methods,this technology has the advantages of high efficiency,low cost,no pollution,simple operation and strong applicability.This paper introduces the principle and application status of aerosol printing technology,makes aerosol printing lines through the principle,and conducts simulation and practical experiments to obtain more reasonable parameters,and experiments on the pressure sensor coming out of the fingertip of the somatosensory glove,and looks forward to its future development direction.The project has completed the following contents:(1)An aerosol spray printing experimental platform was constructed,which was composed of atomizing device,printing head,three-axis moving platform and thermostatic adjustable heating platform.The system realizes three functions of aerosol focusing,control of print trace and heating and curing of trace.(2)The fluid simulation analysis of aerosol print head internal flow field was carried out.The three-dimensional flow channel model of the aerosol print head was established,and the fluid simulation analysis of the flow field in the aerosol print head was carried out by using ANSYS Fluent software.Based on this experiment,the main factors affecting aerosol printing quality were studied.The control variable method was used to study the main factors affecting the print trace,such as carrier gas flow and sheath gas flow.Experiments show that the line width first increases and then decreases with the increase of carrier gas,and the effect is obvious.The trend of line width increasing first and then decreasing and then increasing with the increase of sheath gas;The line width has little effect in the range of 1～2.5mm,but it will significantly expand the line width if it exceeds it;Under the same print volume,the effect of movement speed on line width is not obvious.(3)The fabrication and performance analysis of piezoresistive flexible pressure sensor with graphene pressure sensitive layer made by aerosol spray printing technology were carried out.By using two different electrodes,single-sided and double-sided electrodes,for pressure sensitivity testing,the sensitivity of single-sided electrodes is high.Then the hysteresis test of the single-sided electrode is carried out,and the hysteresis of the single-sided electrode is not high.In addition,the application experiment of quantifying grip was carried out to prove that somatosensory gloves can be applied to quantify gripping force and other directions.