Arrangement And Transformation Of Te Nanowires

Nanomaterials have a variety of special performance for their unique microstructures. Among them, the Te nanowires have good photoconductive properties, pyroelectric and piezoelectric characteristics, nonlinear optical properties and other special properties. Therefore they have been widely used in the gas sensors, photoelectric devices, photonic crystals, and other fields. Because of the unique anisotropic growth tendencies and potential applications, the development of Te nanowires synthesis and assembly techniques is very necessary. In addition, Te nanowires are the ideal templates to synthesize numerous materials, such as Pd, Pt, Ag2Te and CdTe so on. Due to one-dimensional nanowires are anisotropic materials, therefore arrange Te nanowires orientation is the precondition to apply they to the device and reach their full potential.In this dissertation, we used the stirring effect to make Te nanowires orientation arrangement in liquid-solid interface, prepared of two-dimensional Te nanowire arrays, and on the basis of the use of chemical conversion to prepared the Pt, Pd and Ag2Te two-dimensional array. In this dissertation, the high aspect ratio of Te nanowires were prepared by hydrothermal synthesis, and the dimension and morphology of the products were characterized by SEM. Then we brought stirring to produce shear force as the driving force to assemble Te nanowires in water, ethylene glycol and glycerol respectively, and the dimension and morphology of the assembled Te nanowires were characterized by SEM as well, which proved that the auxiliary role of the stirring and ethylene glycol as the solvent could successfully prepare highly oriented two-dimensional array of Te nanowires. Meanwhile, we investigated a number of influence factors in ethylene glycol assembly system, including the stirring rate, the concentration of nanowires, the assembly time and stirring methods. According to the experimental results, the reasons of the orientated arrangement were primarily discussed. Furthermore, we used the oriented Te nanowires as templates to fabricate Pt, Pd and Ag2Te nanowires arrays by in-situ chemical reaction, that made the preparation of Pt, Pd and Ag2Te ordered nanowire structure possible. Last but not least, the multilayer of Te nanowires were built by using polymer PEI or PSS/PDDA as spacer-layer. This work has offered comprehensive understanding about the method of driving force of the shear force produced by stirring to assembly Te nanowires. This research has provided a new method for Te nanowires and other related nanowires ordered assembly, and has the certain application prospect in electronic devices and sensors.