Order-assembly And Functionalization Of Organic Nanowires

In recent years, one dimensional (1D) nanostructruedmaterial, such as nanowires, nanobar, nanotube andnanofibers, have been a subject or intensive research due totheir unique properties and potential applications innanodevices and photoelectrical devices, so 1Dnanomaterials were considered the building block innanodevices. A large number of synthetic and fabricationmethods have already been demonstrated for generating 1Dnanostructures in the form of fibers, wires and tubes fromvarious materials. Among these methods, electrospinningseems to provide the simplest approach to nanofibers(nanowire or nanotube) that are exceptionally long in length,uniform in diameter, and diversified in composition. Unlikeother methods for generation 1D nanomaterials, theformation of a thin fiber (diameter from 10 nm to severalmicrometer) via electrospinning is based on the uniaxialstretching (or elongation) of a viscoelastic jet derived from apolymer solution or melt. This technique is similar to thecommercial processes for drawing microscale fibers exceptfor the use of high electrostatic repulsions between surfacecharges to continuously reduce the diameter of a viscoelasticjet. The preparation of 1D nanodevice materials and how toassemble the 1D nanomaterials are the two main challengein building nanodevices.In this dissertation, we developed a simple and novelmethod based on electrospinning technique for generationhigh-quality and large-scale electrical bistablenanowires(nanofibers). The electrical bistability wasobserved in the electrospun polymer nanofibers (PAN)containing Ag nanoparticles and TCNQ, and the Agnanoparticles and TCNQ buildup an effectivedonor-acceptor system. We also assemble the 1Dnanomaterils into order structure (parallel) with samedistance from 500 nm to 1000 nm. Additionally, the crossedstructures were obtained, and the result indicate that theassemble technique of electrospun nanofibers was powerfuland shown potential application in buildup nanodevices.In summary, electrospinning is a simple and effectiveapproach for producing continuous polymer nanofibers. Theelectrical bistable nanofibers were synthesize byelectrospinning and photochemical reaction and orderednanofibers were obtained by our methods. This makes theelectrical bistable nanofibers a potential candidate fornanoscale memory elements and switches in electronicnanodevices. We believe that a series of electrical bistablenanofibers consist of similar donor-acceptor system could beobtained by this novel method.