The Application Of Functional Semiconducting Nano-materials In Hydrogen Ion And Photo Detection Fields

As an advanced analytical technique,nano sensor has caught widespread attentions in fields of hydrogen ion detection,photo detection and other detections,because of its many advantages including strong specificity,high sensitivity,rapid detection,and easy operation.Specificly,investigating the sensor based on the electic characteristics of functional semiconducting nanomaterials has been considered as the central part,for the nanomaterials strongly affect the main performance and application value.Therefore,this dissertation selects zinc oxid and molybdenum disulfide as the sensing materials,which are conbined with surface modifications,to fabricate the pH sensor and optoelectric sensor,and studies their main performances.In addition,the nanopaper has been introduced to replace the traditional silicon substrate,which is a useful attempt in order to develop biodegradable,flexible and transparent sensors.The main innovation of this paper is as follows:1.The specific adsorption of functional semiconductor nanomaterials(ZnO)can be used to realize the high resolution detection of hydrogen ion concentration in solution,and for the first time,we obtain the pH sensor with stable sensing and large detection range.On the same time,we study the Zn O pH sensor with different surface to volume ratio,the results show that: the higher the surface ratio of the material is,the higher the sensor is.And the sensor with high surface ratio have higher sensitivity,stability,real-time response speed and dynamic detection range.2.The effect of surface potential of zinc oxide and hydrogen ion on the electrical properties of the material has been studied in detail.The surface modification of functional zinc oxide semiconducting nanomaterials is proposed for the first time,and the sensors which surface structure of the zinc oxide nanostructured modified with the amide monolayer has been successfully prepared.The testing results show that the main performance indexes of the modified sensor are improved remarkably.3.In the field of photon detection,the molybdenum disulfide functional semiconductor material with specific band structure has been prepared as a photosensor.The idea of using ionic gel electrolyte as the sensor dielectric layer structure is put forward for the first time.Through the in-depth theoretical analysis and rigorous experiments,it can be seen that the carrier density and the electron mobility of molybdenum disulfide photoelectric sensor after surface modification are greatly improved;the corresponding sensitivity and detection range of the sensor to convert the photon signal to electrical signal are also improved significantly.4.First proposed to transfer the traditional silicon-based sensor to the biocompatible,translucent and softness nano-paper.The innovative introduce the ion gel electrolyte to the sensor forming sandwich packaging structure.Realize the high efficiency of photon signal conversion to the electrical signal,and stable reliable sensor detection at the same time.This photodetector exhibites broad application prospects in the fields of biomedical and environmental.