Elementary Exploration On The Manipulation Of Carbon Nanotubes And Related Fundamental Techniques

Bottom-up construction of nanostructures from molecular-sizedcomponents is not only a fundamental technique in nanofabrication but also aneffective method to explore interactions between entities at nanoscale.Recently, nanomanipulation has developed from single-atom manipulation tocomplicated molecular manipulation. Carbon nanotubes, which have uniquemechanical and electrical properties, have become an ideal material fornanomanipulation. In order to realize the construction of nanostructures fromcarbon nanotubes, the manipulation of carbon nanotubes and relatedfundamental techniques, such as the dispersion and positioning of carbonnanotubes, is researched via experiments in this study. In present dissertation, preparation methods for the dispersion sample ofcarbon nanotubes are explored. And the influences of several experimentalfactors on the preparation of dispersion sample are discussed. Experimentalresults indicate the status of substrate, the kind of raw carbon nanotubesmaterials, the time of ultrasonic vibrations and the disperse concentration allcan change the ultimate disperse state of carbon nanotubes. Atomic Force Microscope (AFM) tips are used as tools to manipulatecarbon nanotubes and the micro-mechanical analysis on the dynamic processesin the manipulation of carbon nanotubes is conducted. By observing the lateralforces acting on AFM tips during the manipulation of carbon nanotubes, theauthor finds that when the chemical composition and surface topography aredifferent, the microscopic friction obviously changes. Several importantparameters regarding mechanical properties of carbon nanotubes can beobtained from the lateral force curves during manipulation. Finally, the author makes use of the differences in the interactions betweencarbon nanotubes and self-assembled monolayers to produce chemically ? II ?functionalized templates for the positioning of carbon nanotubes. Thefundamental techniques in the preparation processes of chemicallyfunctionalized templates are explored. And the growth mode, shape methodsand the synthesis of two kinds of self-assembled monolayers are also carefullydiscussed.