Study On Photoelectric Properties Of Flexible,Conformal Composite Proximity Sensor

The proximity sensor is a sensor that can sense the existence of an object without directly contacting the detected object.People have prepared various types of proximity sensors based on various principles such as ultrasound,infrared,and magnetic induction,which are widely used in mobile phones,automatic doors,automobiles and other fields,which greatly facilitate our lives.However,most proximity sensors are bulky and inflexible,which limit their application in wearable electronic devices.At present,capacitive proximity sensors and organic semiconductor proximity sensors are widely concerned by researchers because of their flexibility and ease of integration into wearable electronic devices.It is reported that capacitive proximity sensors can only detect the proximity of conductive objects,while organic semiconductor proximity sensors can only detect the proximity of charged objects,which severely limit the application of proximity sensors in real life.If these two types of proximity sensors can be integrated and their proximity sensing capabilities for different types of objects are combined,then the application range of proximity sensors will be greatly expanded.In this paper,we prepare flexible capacitive proximity sensor and organic semiconductor proximity sensor on PET and then compound these two types of proximity sensors on the same PDMS substrate to prepare a flexible and conformal composite proximity sensor.The sensor realizes the proximity detection of various objects.The specific work is as follows:1.Constructed a flexible capacitive proximity sensor based on PDMS dielectric,and systematically studied the proximity sensing performance.Experimental results show that the sensor can sense the proximity of a finger and a steel ruler,but not the proximity of a charged glass bar and a charged rubber bar.2.Based on rubrene single crystal,an organic semiconductor-type proximity sensor was constructed,and the proximity response of the sensor to fingers,steel ruler,positively charged glass bar and negatively charged rubber bar was studied.It was found that the sensor cannot sense the approach of the steel ruler,but it can sense the proximity of fingers,positively charged glass bar and negatively charged rubber bar.3.Based on the elastic substrate PDMS,a flexible and adaptable composite proximity sensor was constructed and attached to the prosthesis.The results show that the sensor can sense the proximity of a finger,gold ring,and plastic ring,successfully achieving the proximity detection of insulators and solving the problem that the sensor can only detect the proximity of a single type of object.Furthermore,the electrode of the composite proximity sensor is changed from a cross structure to a planar structure,which simplifies the device configuration and realizes the proximity sensing of various objects.