Title:
Shape-preserving physical and chemical transformations of Si and SiO₂ nano- and microstructures
Shape-preserving physical and chemical transformations of Si and SiO₂ nano- and microstructures
Author(s)
Gordin, Ari
Advisor(s)
Sandhage, Kenneth H.
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Abstract
This thesis considers two broad categories of shape-preserving transformations: physical transformations, in which the chemistry of the as-grown material remains constant but some structural change is introduced (i.e., conversion of dense silicon nanowires into porous silicon nanowires); and chemical transformations, in which the physical structure of the as-grown material remains constant but the chemical composition is changed (i.e., conversion of SiO2 photonic crystal fibers into MgF¬2 photonic crystal fibers). Part I of this thesis focuses on the development of a process which allows for the introduction of porosity into dense silicon nano- and microstructures (a shape preserving net physical transformation, albeit by chemical means), while Part II focuses on conversion of SiO2-based photonic structures, including three dimensional photonic crystals and hollow-core photonic crystal fibers into Mg2Si or MgF2 replicas with more desirable chemical compositions (a shape preserving net chemical transformation) possessing enhanced optical characteristics.
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Date Issued
2014-06-30
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Text
Resource Subtype
Dissertation