||I U P A C
for Young Chemists
.... 2008 winners
Organizations & People
Winner of the IUPAC
for Young Chemists - 2008
Andrea Rae Tao
wins one of the five IUPAC Prizes for Young Chemists, for her
Ph.D. thesis work entitled "Nanocrystal Assembly for Bottom-Up
Current address (at the time of application)
Ph.D., University of California, Berkeley, May 2007,
A.B., Harvard University, June 2002, Chemistry
Title Nanocrystal Assembly for Bottom-Up Plasmonic Materials
Adviser Professor Peidong Yang
Thesis Committee Prof. Angelica Stacy, Dept. of Chemistry;
Prof. Ronald Gronsky, Materials Science & Engineering
Plasmonic materials are emerging as key platforms for applications
that rely on the manipulation of light at small length scales. Sub-wavelength
metallic features support surface plasmons that can induce huge local
electromagnetic fields at the metal surface, facilitating a host of
extraordinary optical phenomena. In this dissertation, Ag nanocrystals
and nanowires are used as building blocks for the bottom-up fabrication
of plasmonic materials for photonics, spectroscopy, and chemical sensing.
To begin, faceted Ag nanostructures are synthesized using a colloidal
approach to regulate nucleation and crystallographic growth direction.
Next, new methods of nanoscale organization using Langmuir-Blodgett
compression are presented in 1-D and 2-D assemblies can be constructed
with impressive alignment over large areas. Using this method, plasmon
coupling between Ag nanostructures can be controlled by varying spacing
and density, achieving for the first time a completely tunable plasmon
response in the visible wavelengths. Lastly, these assemblies are demonstrated
as exceptional substrates for surface-enhanced Raman sensing by achieving
high chemical sensitivity and specificity, exhibiting their utility
as portable field sensors, and integrating them nto multiplexed lab
on-a-chip devices......[full text; pdf
file - 748KB]
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