The Synthesis And Formation Mechanism Study Of InAlO₃ （ZnO）_m Superlattice Nanowires

Recently, the fabrication of one-dimensional nanostructures has been attracting great attention due to their unique physical and chemical properties and promising application in nanodevices. Zinc oxide （ZnO） is a direct wide-band gap （3.37 eV） semiconductor with a large exciton binding energy of 60 meV, which ensures its efficient ultraviolet （UV） emission up to room temperature. So far, ZnO has attracted extensive attention after GaN as a promising candidate material for fabricating optoelectronic devices operating in the blue and UV region. Based on the high electromechanical coupling factor, biology security, high stability under hard conditions and the versatile applications of the ZnO material, one dimensional ZnO nanostructures have been extensively studied. On the physical properties of ZnO nano materials, improvement is the focus of research. In addition to controlling the size of materials, structures, mixed in ZnO in N, P, etc.Ⅴgroup elements can also be achieved from the n-type ZnO to p-type conversion; in ZnO mixed with Al, Ga, In, etc.Ⅲgroup elements, by improve the way the carrier concentration can enhance the ability of their conductivity. To further improve the UV light intensity and the superlattice structure based on quantum confinement effect can improve the efficiency of luminescence, InAlO₃（ZnO）_m superlattice nanowire become a research hotspot.In this thesis, InAlO₃（ZnO）_m superlattice nanowires are successfully synthesized via chemical vapor deposition, using Au catalyst. High-resolution transmission electron microscopy observations indicate that these nanowires consist of an alternative stacking of InO₂^- layer and AlO（ZnO）_m⁺ block along the [0001] direction. The periodicity of these nanowires is proportional to their diameter, which is determined by the Au alloy particle size at the tip of the nanowire. Linear relationship between the periodicity and the diameter is well explained by a cylindrical configuration model. Our results indicate that controlled synthesis of InAlO₃（ZnO）_m superlattice nanowires becomes possible. Photoluminescence properties of InAlO₃（ZnO）_m superlattice nanowires were studied.