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Winner of the IUPAC
Prize
for Young Chemists - 2006
Current address (at the time of application)
Department of Chemistry
University of California, Berkeley
Berkeley, CA. 94720
E-mail: [email protected]
Academic degrees
-
Ph.D., University of California, Berkeley, December
2005, Chemistry
-
B.A., Wesleyan University, May 1999, Chemistry
Ph.D. Thesis
Title Oxide Nanowires for Sensing, Photonics
and Photovoltaics
Adviser Professor Peidong Yang
Thesis Committee Prof. Peidong Yang, Chemistry
(Chair), Gabor Somorjai (Chemistry) and Ronald Gronsky (Materials
Science)
Essay
One-dimensional inorganic nanostructures are a promising
class of basic building blocks for future optoelectronic, mechanical
and energy conversion devices. In this dissertation, single-crystalline
SnO2 and ZnO nanowires are used as model materials in proof-of-concept
demonstrations of nanowire-based photodetection, chemical sensing,
thermometry, photonics and photovoltaics. Each demonstration leverages
specific attributes of the wire shape, such as its ability to confine
and conduct electrons and photons, to produce miniature devices with
novel functionality. To begin, single oxide nanowires made by vapor
deposition are fabricated into ultraviolet photodetectors and fast,
stable and responsive gas sensors. Next, a conceptually new synthesis
of multi-component nanowires is presented in which nanowires with
rectangular cross-sections act as templates for the deposition of
a complementary material. The resulting bilayer structures act as
nanoscale temperature sensors that bend when heated or cooled and
offer an ideal geometry for studying the dynamics of interfaces by
electron microscopy. In addition, SnO2 nanowires thinner than the
wavelength of visible light are shown to function as versatile waveguides
that are suitable for signal routing, frequency filtering and spectroscopy
in integrated nanoscale optical circuitry. The length, flexibility
and strength of these nanowires enable the construction of nanowire
emitter-waveguide-detector junctions and other prototype assemblies.
The final topic of this thesis is the development of ordered solar
cell architectures based on arrays of nanowires coated with a molecular
dye or encased in a polymer. A facile and flexible aqueous synthesis
of ZnO nanowire arrays is presented, and the performance of three
different types of nanowire solar cells discussed...[more;
pdf file - 4.05MB]
Page last modified 4 May 2006.
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