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Item Description Ge, Maohui en_US 2009-07-15T18:08:02Z 2009-07-15T18:08:02Z 1993 en_US
dc.description Thesis (Ph. D.)--University of Hawaii at Manoa, 1993. en_US
dc.description Microfiche. en_US
dc.description xii, 87 leaves, bound 29 cm en_US
dc.description.abstract Novel forms of carbon have attracted intense interest since the discovery of C60, a molecule with a spherical cage, and its solid form. In this dissertation, our research work on the generation and scanning tunneling microscopy (STM) studies of two novel carbon structures, tubules and cones are summarized. We have produced nanotubes of carbon on a highly-oriented pyrolytic graphite substrate by vapor-phase growth. Using a scanning tunneling microscope, we found tubules with extremely small diameters from 1 nm to 8 nm. Their lengths are up to several hundred nanometers. They are closed by hemispherical caps. Some of them are isolated while some are parallel aligned and closely packed, forming bundles. Atomic resolution images of carbon tubules were obtained for the first time, showing that the tube surfaces are perfect graphitic networks. Besides tubular structures, we also produced nanocones of carbon by the same generation method as that of tubules. This is the first observation of carbon conical structures. The observed cones are up to 24 nm in length and 8 nm in base diameter. Amazingly they all have a unique cone angle of ~19°. We show that this is the smallest one among five possible opening angles for perfect graphitic cones. Based on our STM observation, we propose that the growth of carbon nanotubes, nanocones, and fullerenes may all be initiated by fullerene-type nucleation seeds. The number and the distribution of pentagons may play an important rule in their growth process. en_US
dc.language.iso en-US en_US
dc.relation Theses for the degree of Doctor of Philosophy (University of Hawaii at Manoa). Physics; no. 2946 en_US
dc.rights All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner. en_US
dc.title Generation and STM studies of carbon nanotubes and nanocones en_US
dc.type Thesis en_US
dc.type.dcmi Text en_US

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