| In recent years,information security and storage technology have been widely used in people’s daily life,economic and military fields.With the rapid development of information science and technology,the demand for information storage materials with high storage capacity and high security is becoming more and more urgent.Fluorescent functional materials with stimulating response can stimulate the change of fluorescence or fluorescence color based on external factors,which can be used to the field of encryption or storage.If the fluorescent color and fluorescence lifetime can be applied to coding and encryption,it is not only the information storage capacity can greatly increase,but the security of data transmission can be improved.In this paper,an amide type β-diketone ligand capable of reacting with acid and alkaline gas was synthesized.The lanthanide complex,which was prepared by the ligand and Eu3+/Tb3+,can be further supported on the filter paper to prepare a paper-based lanthanide smart device.The device can show green or red fluorescence in the acid-base gas environment,respectively.With this fluorescence response characteristic,the smart device can be applied to the detection and identification of the acid-base gas and the operation of the logic gate.In addition,the lanthanide-based hybrid material can also be injected into the clean neutral refill as a fluorescent anti-counterfeiting ink,so that can be achieved in the field of information security applications.Based on the excellent fluorescence response of the amide type β-diketone ligands,the lanthanide complexes with the fluorescence response of the acid-base gas can be combined with the carbon dots by the method of supramolecular assembly.Through this way,we obtained a new lanthanide-based smart nanocomposite.This system not only effectively concentrates the fluorescence properties of lanthanide complexes and carbon dots,but also improves the water solubility and photo-stability of lanthanide complexes by nanometer confinement.The fluorescence spectra of the material can be changed by the regulation of the excited energy level of the ligand through acid-base gas,thus realizing the storage and encryption of information in the spatial dimension.At the same time,based on the difference of the fluorescence lifetime of lanthanide ions and carbon dots,the signal from nanometer to microsecond can be obtained in time dimension,so that the safety performance can be greatly improved in the path of information transmission.This dissertation is divided into three parts:1.Firstly,the research status of stimulating response materials is briefly introduced,as well as its research progress in fluorescent anti-counterfeit and information security.2.The amide type β-diketonated lanthanide complexes whose fluorescent color can response to acid-base gas were synthesized.Their molecular structures were characterized by mass spectrometry,nuclear magnetic resonance(NMR)and infrared spectroscopy(FTIR),etc.And then the lanthanide complexes were further loaded on the filter paper to prepare a paper-based lanthanide smart device.The use of the device can be achieved on the detection and identification of acid or alkali gas,and its application in the logic gate operation and security areas were also studied.3.Based on the idea of supramolecular assembly,carbon dots,as the matrix,were combined with the amide type β-diketone lanthanide complexes by means of coordination effect to build a new lanthanide smart nanocomposite material.The composition and fluorescence properties of the material were studied by infrared spectroscopy,fluorescence spectroscopy and photoelectron spectroscopy,etc.Through the inkjet printing technology,the nanocomposite material can be used as fluorescent ink to achieve the application in the field of information storage and encryption.In addition,through the change of the fluorescence lifetime of the material in different acid and alkaline environment,and the possibility of information transmission in time dimension were also discussed. |
PDF Full Text Request