The Study Of Design And Synthesis Of Organic Compound For Ultrahigh Density Information Storage

The 21 century is an era of high technology with economy informationization and information digitalization. The explosive increasing of information has put forward higher demand for the development of information storage. The studies of materials and technologies for ultrahigh density information storage are of great importance not only for fundamental research but also for practical application. In this thesis, several organic NLO molecules were designed or selected for the study of bistability and the properties for ultrahigh density information storage were explored.Firstly, in this thesis, organic thin films of a NLO material ((E)-1-Ferrocenyl-2-(1-methyl-4-pyridiniumyl) ethylene Iodide) were prepared by a vacuum deposition method. The typical I-V curve of the film exhibits a favorable room-temperature bistability. Further recording experiments have been performed with a scanning tunneling microscope, which confirmed that the thin film of the donor-p-acceptor NLO material could certainly be applied for nanoscale data storage. The average size of the recorded marks is about 1.5 nm. Mechanism analyses suggest that the formation of the recording dots is due to the local change of electrical property of the thin film, and the intermolecular charge transfer induced by electric field is proposed as the reason for the change.Secondly, we report the synthesis of an donor-p-acceptor (D-p-A) molecule with ferrocenyl group,(1-Ferrocenyl-2-( 4-nitrophenyl) imine), and thin film was prepared. To study the electrical character, we measured the macroscopical I-V curve of the thin film. The typical I-V curve of the film exhibits that the film has a favorable room-temperature bistability. Moreover, our further recording experiment have been performed with a scanning tunneling microscope which confirmed that the thin film of the D-p-A molecule can certainly be applied for nanoscale data storage.Thirdly, we select a organometallic salt that incorporate the magnetic ferrocenyl moietie as the electron donor and 1-methylpyridinium as the electron acceptor which are stable at ambient temperature and pressures as our material having been widely confirmed to possess excellent NLO preoperty based on the essential cause of inducing or affecting the magnetic-optical-electrical bistability. We have managed to prepare a novel organic thin film which can behave room-temperature magnetic-electrical bistability. Moreover, its transformation between the two states is brought about by electrical control which has faster response-speed than thermal control. For practical applications, we achieved nanometer-scale recording on the organic thin film media with Scanning probe microscope(SPM) which has been demonstrated to be an important tool on functional organic thin film for future ultrahigh-density information storage.