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ERIC Number: ED525177
Record Type: Non-Journal
Publication Date: 2009
Pages: 221
Abstractor: As Provided
Reference Count: 0
ISBN: ISBN-978-1-1096-4325-1
Heterostructures Prepared by Surface Modification of Nanocrystals
Lee, Bo Hyun
ProQuest LLC, Ph.D. Dissertation, University of Illinois at Urbana-Champaign
Inorganic nanocrystals (NCs) have drawn the attention from many researchers due to their promising potentials for next generation technologies, from photovoltaics to biological applications. Various types of NCs have become available by synthetic protocols developed in the last two decades. In addition, multicomponent hybrid NCs which can be expected to exhibit novel and unique properties from collective interaction between components have been reported recently. Despite this progress in the preparation of nanoscale materials, developing efficient and reliable ways of assembling/patterning NCs into ordered structures to utilize their potentials still remains a challenge. Controlling surface moieties of individual NCs may be one of the most effective methods to tailor surface properties of particles to be compatible with other surrounding phases (e.g. polymer or metal oxide) that may be necessary and thus leading to robust and ordered NC assembly. In addition, anisotropic surface functionalities on multicomponent hybrid NCs may lead to functional NC heterostructures with single particle precision. Here, we present NC-based heterostructures achieved from surface modified NCs. Surfactant bilayers formed around NCs have allowed hydrophobic NCs to be transferred into aqueous phase as well as facilitating formation of NC heterostructures via polymerization or sol-gel reaction. Coincidence lattice mismatch and surface functionality effects of metal oxide seed particles have been examined for formation of metal oxide-Au heterostructures by direct growth of Au NCs. Based on studies of surface cap exchange reaction of single component NCs, Au-Fe[subscript 3] O[subscript 4] heterodimers have been asymmetrically surface modified to utilize coalescence of small Au particles to bring together different types of nanostructures. With coalesced Au bridges as interconnects, hybrid NC-based higher order structures have been achieved. The configuration of coalesced structures exhibits steric hindrance limited assembly. Upon asymmetric surface modification, reactive Au in heterodimers adsorb on Au nanorod (NR) surface and coalesce into ordered, plasmonic NC-based heterostructures. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page:]
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Publication Type: Dissertations/Theses - Doctoral Dissertations
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A