Construction Of Ultraflexible Organic-field-effect-type Artificial Synapse Based On Pullulan And Its Properties Research

Ultraflexible organic-field-effect-type artificial synaptic devices with optical,electrical,and humidity mulimodal modulation can not only meet the needs of convenience,comfort and beauty of wearable electronics,achieving a seamless fit with the human body,but also provide an opportunity for biomimetic neuromorphic system to realize the simulation of image recognition,data processing,and information storage at the hardware level.It avoids the complex operation and huge energy consumption of software simulation,and is expected to open a new chapter of bionic application.However,most of the reported artificial synaptic devices are based on hard inorganic materials as insulation layer.On the one hand,the wearable requirements of flexible electronic devices cannot be realized at the structural level,which limits the deep application of neuromorphic electronics in brain computer interface,soft skin and other flexible fields.On the other hand,the functionalization of the device is relatively simple,and it is impossible to integrate mulimodal-synergistic-modulation functions such as light,electricity and humidity on one device at the same time,which seriously limits its further development in the fields of bionic retinal and implantable visual prosthetics.Aiming at these challenges,we successfully fabricated the ultraflexible artificial synaptic devices with optical,electrical,and humidity mulimodal modulation.The synaptic function of human brain and the flexible structure,moist environment and imaging function of human eyes are successfully simulated.The main contents are listed as follow:1.It was found that pullulan is an excellent natural proton conductor with good mechanical properties,which provides a reliable material source for constructing ultraflexible green artificial synaptic devices.In addition,pullulan membrane has good humidity sensitivity,which is conducive for device to achieve humidity modulation function.2.An organic-field-effect artificial synaptic device with the thickness of 392 nm was constructed based on pullulan insulating layer,and various brainlike synaptic plasticity behaviors are successfully simulated.The device has good mechanical stability,ultraflexibility,humidity modulation function and environmental stability.Even on the edge of a blade with the extreme bending radius of 3.6 μm,the device still maintains stable synaptic performance.3.The device showed good photoelectric synaptic plasticity and the ability of multimodalsynergistic-modulation of light,electricity and humidity.By surface fitting of ultraflexible device arrays to the transparent hemisphere,neuromorphic imaging and preprocessing functions of retina-like vision were successfully simulated,and the imaging behavior of dry eye under different relative humidity was successfully realized.