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Ziling (Ben) Xue
Ziegler Professor
Inorganic and Organometallic
Chemistry
Organometallic silicon chemistry;
microelectronic materials;
sensors and bioanalysis
B.S., Nanjing University of Pharmacy-
Nanjing University (1982)
Ph.D., University of California,
Los Angeles (1989)
NSF Young Investigator
Dreyfus Teacher-Scholar
DuPont Young Professor
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E-mail: xue@utk.edu
416 Buehler Hall · Telephone: 865-974-3443
Representative publications ·
Biographical sketch ·
Group Web page
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Research
Our research program is centered around two areas: (1) chemistry of
organosilicon complexes,
and (2) sol-gel approaches to
advanced materials. These areas involve research in both fundamental
chemistry and applications in high-tech materials. The research gives
us opportunities to practice the science of molecular and solid-state
materials synthesis and to understand the fundamental mechanistic
pathways in the reactions. These research projects have been
funded by the National Science Foundation (NSF), a Camille Dreyfus
Teacher-Scholar Award, a DuPont Young Professor Award, the Department of
Energy, and UT's Measurement and Control Engineering Center.
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Organometallic Silicon Chemistry and Molecular Routes to
Microelectronic Silicon-Containing Materials
Materials containing both metals and silicon are important components
of current very-large-scale-integration (VLSI) devices. These
materials include M-Si-N ternary materials and metal silicides.
Silicides
are also widely used in rocket and turbine technologies due to their
outstanding mechanical properties and corrosion resistance.
The new routes to make Ti-Si-N ternary thin films
involve the reactions of
SiH4 and
NH3 with amide complexes such as
Ti(NR2)4:
Ti(NR2)4 + SiH4 =
TiN-Si3N4
We have investigated the mechanistic pathways in the formation of
silicides and M-Si-N ternary materials, and isolated novel compounds
such as amide hydrides
[(Me2N)3M(mu-H)(mu-NMe2)2]2M (M = Zr or Hf).
The synthesis, structures and bonding, and reactivities of these model
compounds
would indicate mechanistic pathways in the formation of microelectronic
materials.
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Sol-Gel Materials
Sol-gel processes refer to the hydrolyses of, e.g., Si(OR)4
to form SiO2, and have been recently explored to make mixed
metal oxides and to dope functional groups or molecules in oxide solid
matrices. The oxide materials produced by such hydrolysis processes
are called sol-gel materials. In collaboration with Oak Ridge
National Laboratory (ORNL), we have been studying the following
sol-gel materials:
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Sol-Gel Sensors.
This is an interdisciplinary area between analytical and inorganic
chemistry. We have developed durable acid and base sensors by
sol-gel methods for in-situ high acidity ([H+] = 1-9 M) and
basicity measurements. These sensors are based on the spectroscopic
changes of organic indicators immobilized in a sol-gel or mixed oxide
matrix coated as thin films. Such specific applications are desired
in certain industrial environments for high acidity/basicity
monitoring and
process control. Unique techniques for making stable thin film
coatings have been developed in our laboratory.
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Rare Earth Aluminate and Ferroelectrics Films via Sol-Gel
Processes.
In collaboration with Dr. David Beach's group at ORNL, we have been
developing all-alkoxide routes for the preparation of rare earth
aluminates as buffer layers for high-temperature superconductors and
layered bismuth-containing ferroelectrics of the general formula
(Sr,Ba)Bi2(Nb,Ta)2O9. These sol-gel
routes have produced epitaxial rare earth aluminates on strontium
titanate (100) single crystals and highly oriented thin-films over
silver and single-crystal strontium titanate substrates.
Representative publications
Reaction of Ta(NMe2)5 with O2: Formation of aminoxy and unusual (aminomethyl)amide oxo complexes and theoretical studies of the mechanistic pathways. Chen, S.-J.; Zhang, X.H.; Yu, X.H.; Yap, G.P.A.; Guzei, I.A.; Lin, Z.; Wu, Y.-D.; Xue, Z.-L. J. Am. Chem. Soc. 2007, 129, 14408-14421.
Preparation of tungsten alkyl alkylidene alkylidyne complexes and kinetic studies of their formation. Morton, L.A.; Chen, S.-J.; Qiu, H.; Xue, Z.-L. J. Am. Chem. Soc. 2007, 129, 7277-7283.
A kinetic study of the silyl substitution in tantalum amide silyl complex (Me2N) 3Ta[Si(SiMe3) 3] 2. Qiu, H.; Chen, S.-J.; Xue, Z.-L. Inorg. Chem. 2007, 46, 6178-6181.
Tungsten alkyl alkylidyne and bis-alkylidene complexes. Preparation and kinetic and thermodynamic studies of their unusual exchanges. Morton, L.A.; Wang, R.; Yu, X.H. ; Campana, C.F.; Guzei, I.A.; Yap, G.P.A.; Xue, Z.-L. Organometallics 2006, 25 427-434.
Inorganic sensing using organofunctional sol-gel materials. Carrington, N.A.; Xue, Z.-L. Acc. Chem. Res. 2007, 40, 343-350.
Quantitative analysis of trace chromium in blood samples. Combination of the advanced oxidation process with catalytic adsorptive stripping voltammetry. Yong, L.; Armstrong, K.C.; Dansby-Sparks, R.N.; et al. Anal. Chem. 2006, 78, 7582-7587.
Palladium and the electrochemical quartz crystal microbalance: A new method for the in situ analysis of the precious metal in aqueous solutions. Carrington, N.A.; Rodman, D.L.; Xue, Z.-L. Anal. Chim. Acta 2006, 572, 303-308.
Biographical sketch
Dr. Xue received his B.S. in chemistry from Nanjing University of
Pharmacy-Nanjing University in
1982 and his Ph.D. in chemistry from the University of California
at Los Angeles in 1989. Following postdoctoral research at
Indiana University, he joined the faculty of the University of
Tennessee in 1992. He has served as an executive member of the
ACS Division of Inorganic Chemistry.
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