Fabrication Of Three Kinds Of Semiconductor Nanowires By Thermal Evaporation Method Fabrication Of Three Kinds Of Semiconductor Namowires By Thermal Evaporation Method

One-dimensional (1D) nanostructured materials have attracted extraordinary attention in the past few decades due to their unique physical and chemical properties and their potential applications as building blocks in nanoelectronics, optoelectronics, resonators, sensors and actuators. In this thesis, we focus on the synthesis, characterization and growth mechanism of SnO2nanobelts, ZnO nanowires and ZnS nanobelts as well as some hierarchical structures and heterostructures. The thesis consists of the following three parts.(1) Synthesis and characterization of SnO2nanobelts, and exploration of Mn-doped and Co-doped SnO2nanobelts. SnO2nanobelts have been synthesized via thermal evaporation method. The as-synthesized nanobelts have a length of tens to hundreds of micrometers, and a width of50-450nm. Besides, we have tried to synthesize Mn-doped and Co-doped SnO2nanobelts by using Mn-doped and Co-doped SnO2powder as precursor, but the results showed no magnetic element was doped into SnO2nanobelts.(2) Synthesis, characterization and growth mechanism of ZnO nanowires, six-fold-symmetrical hierarchical ZnO nanostructure arrays and SnO2/ZnO heterostructures. ZnO nanowires have been synthesized via thermal evaporation method in atmosphere, while ZnO nanowire arrays can be obtained in vacuum. The as-synthesized ZnO nanowires have a length of5-10μm, and a width of80-280nm. The growth of ZnO nanowires can be explained by vapor-liquid-solid (VLS) mechanism. Besides, we have synthesized six-fold-symmetrical hierarchical ZnO nanostructure arrays and SnO2/ZnO heterostructures by a two-step vapor deposition method.(3) Synthesis, characterization and growth mechanism of ZnS nanobelts and ZnS/C core-shell heterostructures. ZnS nanobelts have been synthesized via thermal evaporation method. ZnS nanobelts have a length of more than tens of micrometers, and a width of100-500nm. The growth of ZnS nanobelts can be explained by VLS mechanism. Besides, we have synthesized ZnS/amorphous C core-shell heterostructures by a two-step vapor deposition method.