Controllable Synthesis Of One-dimensional Nanomaterials Of Chalcogenides And Properties Study Of Related Nano-devices And MEMS

This thesis includes two major parts. The first part systemically investigates the controllable synthesis, characterization, doping and alloying of one-dimensional nanomaterials of chalcogenides as well as the fabrication of related NANO devices. The second part is about the measurement, simulation and calculation of adhesion force/energy of the surface of polysilicon-based MEMS devices. The main achievements are as follows:1. A hydrogen-assisted thermal evaporation method to synthesize the CdSe and CdS nanowire arrays was developed. The CdSe nanowire arrays homoepitaxially grew from the single crystal CdSe micro-rods, and the CdS nanowire arrays hetroeptiaxially grew on the single crystal CdSe miro-sheets. The products have excellent single-crystal nature and with highly order. Especially, the CdSe nanowire arrays on the CdSe microrods are recognized as a trunk-branch structure which can be utilized to explain its outstanding photoluminescence/laser properties. This new structure of CdSe is first reported by our group. Different shapes of PbS nanorod arrays were synthesized via hydrogen-assisted thermal evaporation approach. A self-catalyzed combined with a vapor-liquid-solid mechanism was provided to explain the shape evolution of PbS nanorod arrays.2. Ternary CdS_XSe_1-X single-crystal nanoribbons with uniform and controllable compositions (02.