Synthesis and photophysics of dendronized nanomaterials.
Item
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Title
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Synthesis and photophysics of dendronized nanomaterials.
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Identifier
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AAI3169923
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identifier
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3169923
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Creator
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Hodel, Rolande R.
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Contributor
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Adviser: Harry D. Gafney
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Date
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2005
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Language
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English
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Publisher
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City University of New York.
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Subject
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Chemistry, Inorganic | Chemistry, Organic
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Abstract
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Quantum dots (QDs) refer to a size domain in which the physical properties of a material are a function not only of its composition, but also its size. Generally size is controlled through the introduction of a surfactant. Traditionally, n-trioctylphosphine oxide (TOPO) is added to limit the extent of aggregation of the semiconductor cadmium selenide (CdSe). However, TOPO binds strongly to the QDs surface. This research was undertaken using octadecene (ODE) as the coating agent. Here, we describe the synthesis of CdSe quantum dots in ODE, and show that a narrow range of dot sizes is accessible. We also demonstrate that the surface of ODE coated QDs, unlike their TOPO coated counterparts, can be modified by means of a phase transfer reaction. Furthermore, the weaker binding of ODE to the dots presents the opportunity for covalently attaching aliphatic and aromatic thiol functionalized dendrimer wedges, called dendrons. Change in photophysics caused by the attachment of thiol dendrons is measured using absorption, emission intensity and lifetime. The composition of dendronized QDs of a specific size was determined by thermogravimetric analysis, and elemental analysis is our final goal.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
