Construction And Photoelectric Properties Of One-dimensional Nanomaterials Of PTCDIs And Their Composite Semiconductors

The electrical,optical or optoelectronic behavior of organic semiconductor materials is a very important parameter for studying their optoelectronic devices.Organic semiconductors exist in applications including solar cells,field effect transistors,photodetectors,sensors/ intelligent detection,etc.Perylene imide derivative molecules(PTCDIs),as a class of classic N-type organic semiconductor materials,have also been studied in the above applications.In these studies,the sensor is an important research content of PTCDIs.Due to the controllable molecular structure of PTCDIs and excellent fluorescence quantum yield(the yield is close to 100%),it has a good application prospect in sensor detection.In addition,the flatness of the molecular centers of PTCDIs is conducive to the construction of one-dimensional nanostructures through intermolecular self-aggregation.The one-dimensional nanostructure increases the specific surface area of molecular aggregation,which is beneficial for more test objects to be loaded on the surface of the one-dimensional nanostructure and improves the detection performance and detection limit of special properties.In specific environments,PTCDIs molecular structure modification can be used to achieve detection in specified environments,such as organic solutions,aqueous solutions,and high-temperature environments.The traditional detection principle is that the test substance reacts with the specific functional group in the PTCDIs molecule or the functional group loaded on the PTCDIs molecule,and the detection purpose is achieved by changing the electrical signal or the optical signal.However,for the method of using electrical signals to reach the detection object,one-dimensional PTCDIs nanoelectrodes need to be prepared.The traditional onedimensional PTCDIs materials cannot be prepared directly on the electrode in a large area,which reduces the detection limit of the detection object and cannot obtain accurate detection data.In order to solve the defects of low detection limit and inaccurate signal caused by the unevenness of the preparation of PTCDIs nano-electrodes,in this paper,we have designed a method of preparing uniform PTCDIs nano-film electrodes.The structured PTCDIs cover the electrode surface well.Main work: First,a series of PTCDIs containing different substituents were designed and synthesized.The solubility of PTCDIs in solution was tested.At the same time,the optical and electrochemical tests of PTCDIs in solution were tested.One-dimensional PTCDIs electrodes with uniform coverage were prepared on indium tin oxide(ITO)conductive glass by selfassembly,and their optical and electrochemical behaviors were tested.Finally,using PTCDIs nanofiber electrode as a template,a nano-structured P-N flexible composite organic selfsupporting film was prepared by electrochemical polymerization,and the optical behavior of the composite organic self-supporting film was studied.1.Using perylenetetracarboxylic anhydride as raw material,PTCDIs molecules with 5 different substituents were synthesized.The specific substituents are:(1)methyl-3,4-ethylenedioxythiophene(Me-EDOT);(2)cyclohexyl;(3)acetic acid;(4)propionic acid;(5)dodecyl.Infrared,nuclear magnetic,elemental analysis and other characterization methods were used to confirm the molecular structure;at the same time,the thermodynamic stability,electrochemical and optical behavior of all PTCDIs were measured.2.The solubility of synthetic PTCDIs was tested,and a suitable solvent was selected as a good solvent for self-assembly.The one-dimensional nanostructures of PTCDIs with different substituents were constructed by self-assembly method,and the morphology of the prepared one-dimensional nanomaterials was characterized.The characterization results show that when the volume ratio of good solvent to poor solvent is the smallest(V good: V bad = 1: 4),PTCDIs nanofibers exhibit a greater aspect ratio.The electrochemical and optical behaviors of nanostructured PTCDIs were tested.The difference in photoelectric behavior is caused by the difference in solubility of PTCDIs.3.Choose a suitable solvent system and directly prepare one-dimensional PTCDIs on ITO conductive glass.PTCDIs can cover the conductive glass and serve as the working electrode.The platinum electrode is the counter electrode,and the Ag / Ag Cl electrode is the reference electrode.In the three-electrode system,using deionized water / sodium sulfate as the electrolytic system,the electrochemical behavior of the nanofiber electrode was studied.The electrochemical differences and causes of one-dimensional PTCDIs and PTCDIs in different states were discussed.The results show that the one-dimensional PTCDIs exhibit a stronger electrochemical signal,which shows that the one-dimensional PTCDIs have a good application prospect in the field of detection.4.A three-electrode system using tetrabutylammonium hexafluorophosphate as the electrolyte and acetonitrile as the electrolyte,one-dimensional PTCDI was selected as the template,and the conductive polymer precursor EDOT was polymerized by an electrochemical method to prepare PTCDIs / PEDOT-type flexible composite organic semiconductor films.The composite film can detect the structure of one-dimensional PTCDIs under special circumstances such as(organic solvents).Finally,the optical behavior of the composite film is discussed,and the hypothesis and verification of its formation process are provided,which provides a simple and effective new preparation method for the future preparation of P-N composite organic film.