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YuYe
Tong
Associate Professor
Department of Chemistry
Georgetown
University
37th
and O Streets NW
Washington,
DC 20057-1227
Office:
602B
Reiss
Science
Phone: 202-687-5872
Fax: 202-687-6209 E-mail:
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Lab web site |
http://www.georgetown.edu/faculty/yyt/Homepage.html |
Education /
Background |
BSc. 1983 Fudan
University, Shanghai, China
MSc.
1986 Fudan
University, Shanghai, China
DSc.
1994 Ecole Polytechnique
Fédérale de Lausanne, Switzerland
Visiting
Staff Scientist, 1995-1996, Institut de Recherches
sur la Catalyse, CNRS, Villeurbanne, France
Postdoctoral
Associate, 1996-2001, University of Illinois
at
Urbana-Champaign.
[cv] |
Teaching |
Physical Chemical Measurements, Advanced
Topics in Analytical Chemistry,
Analytical Chemistry
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Research Interests |
Analytical & Physical
Chemistry/Nanomaterials Science: Solid-State Surface
Nuclear Magnetic Resonance Spectroscopy, Interfacial
Electrochemistry, Heterogeneous and Electrocatalysis
(fuel cell), Physics and Chemistry of Nano-materials.
Research in my lab is directed towards molecular level
understanding of chemistry and physics of nanoscale
materials in general and polyoxomelate (nanoscale oxygen-metal
cluster) surface chemistry, chemistry and physics of
ligand-protected metal qunatum dots, and electronic
structure-function relationships in catalysis of nanoscale
bimetallic heterogeneous and electrocatalysts in particular.
The research is inherently interdisciplinary, offering
unique opportunities for graduate as well as undergraduate
training in frontier areas of modern chemistry and
nanoscience, encompassing materials-engineering, surface
science and interfacial electrochemistry, condensed
matter chemistry and physics of nanoscale materials,
heterogeneous and electrocatalysis, solid-state NMR,
IR spectroscopy, and quantum chemistry, all directed
towards the improved engineering of novel materials.
Some of the current research projects are as follows:
1. Chemistry and Physics
of Metal Quantum Dots. A
metal QD is an isolated nanoparticle containing
hundreds or thousands of metal atoms which forms
a small enough geometric 3-dimension confinement
of electrons leading to resolvable discrete electronic
energy levels, as opposed to the quasi-continuum
of band structures in its bulk counterpart. Such
metal QDs are the fundamental building blocks
for many nanostructured materials expected to
show unprecedented physical and chemical properties
which are inaccessible using existing materials.
This project is directed toward investigation
of local electronic/structural properties of
ligand-protected metal quantum dots (QDs) as
a function of QD size, number of excess electrons
that the QD carries, and inter-QD spacing in
metal QD superlattices. This project will provide
critical data for understanding the physics and
chemistry of these systems. Such an understanding
is crucial for the ultimate rational design of
novel nanostructured materials which will be
the basis for many future technological applications
2. Surface Chemistry of
Polyoxometalates (POM). POMs
are discrete, nanoscale (0.6 -2.5 nm) molecular
oxygen-metal clusters containing early transition
metal cations M (=V, Nb, Ta, Mo, or W) in an
oxygen-coordinated octahedra, MO6. By sharing
edges and corners, these octahedra usually form
a highly symmetrical structure of general formula
XmMxOyn-, where X (=B, Si, Ge, P(V), As(V), and
some other elements) are the so-called heteroatoms.
POMs adsorbed on metal surfaces have many promising
technological applications. These include, among
others, new heterogeneous catalysts for industrial
oxidation of hydrocarbons, new electrocatalysts
for hydrogen production and oxygen reduction
in fuel cell applications, new electron transfer
mediators for chemical sensors, and new corrosion
inhibitors for replacing the still widely-used
yet toxic chromate inhibitors. However, POM surface
chemistry is poorly understood. This project
is directed toward the heart of POM surface chemistry.
the chemsorption of POMs on electrode surfaces.
Electrochemical NMR and infrared spectroscopies
will be developed to investigate metal-POM bonding
interaction as a function of local chemical environment
and of electrode potential. The potential societal
impacts of this project are numerous.
3. Catalytic Properties
at Real-World Bimetallic Surfaces. The
objective of this project is to use a novel interdisciplinary
approach, which draws diverse strengths from
in situ surface electrochemical nuclear magnetic
resonance (EC-NMR), infrared spectroscopy, and
interfacial electrochemistry, to investigate
the physical and chemical properties of electrochemically-engineered
nanoscale bimetallic surfaces in order to establish
relationships between surface electronic/structural/dynamic
properties and catalytic reactivity in these
real-world bimetallic catalysts with many industrial
applications. This project will provide unique
insights into electronic structure. reactivity
relationships for real-world bimetallic catalysts
and make significant contributions toward establishing
a bridge between low-surface-area models and
high-surface-area industrial catalysts, thereby
furthering our understanding of surface science
in general and bimetallic catalysis in particular.
4. Development of Electrochemical
NMR Spectroscopy. Enhancing
mass detection sensitivity is a constant challenge
for applying solid-state NMR to surface, interface,
and nanoscience. New venues, such as low-temperature
preamplifier system, microcoil and toroidal detection,
polarization transfer, as well as coupling NMR
with other sensitive techniques, will be explored
along the progress of above research projects. |
Recent
Publications |
Georgeta
C. Lica, Benzon M. Dy†,
Andrew R. Pogozelski†,
Y. Y. Tong, " Potential-Dependent
Charge Transfer through
Octanethiol-Protected
Au Nanoparticle Thin
Layer",
J. Am. Chem. Soc.,
in preparation.
Georgeta.
C. Lica, B. S. Zelakiewicz, L.
Smeeding†, Y.
Y. Tong; “Surface
Bonding between
Keggin-Type
Silicotungstate
Anions
and Ag Nanoparticles”,
J. Am Chem.
Soc, resubmitting.
Y.
Y. Tong, “NMR
Investigations
of Nanomaterials:
from Nanoscale
Electrocatalysts
to Monolayer-Protected
Metal Clusters”,
J. Cluster Sci.,
Invited
contribution,
in revision.
B.
Du and Y. Y. Tong, "A
Coverage Dependent
Study of Pt Spontaneously-Deposited
onto Au and Ru Surfaces:
Direct Experimental
Evidence of the Ensemble
Effect for Methanol
Electro-oxidation
on Pt",
J. Phys. Chem. B,
2005, 109, 17775-1778;
web-publsihed on Sept.
7, 2005.
Y.
Y. Tong; "Coupling
Interfacial Electrochemistry
with Nuclear Magnetic
Resonance Spectroscopy:
An Electronic Perspective",
invited book chapter
in In-Situ Spectroscopic
Studies of Adsorption
at Electrode and Electrocatalysis,
S.-G. Sun, P. A. Christensen,
A. Wieckowski, Eds.,
2005, Elsevier Science.
[complete
list]
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page last updated:
April 19, 2006 |