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Prof. Yeshayahu (Shay) Lifshitz
Prof.
Lifshitz joined the Soreq Nuclear Research Center, Yavne on 1971 where
he was working until 2004 (before joining the Technion). Between 1981
and 1987 he was the head of the thin films section at Soreq. In parallel,
between 1985 and 1987 he was a research associate at the Weizmann
Institute. Between 1988 and 1989 he was a visiting professor at the
Chemistry Department of the University of Houston where he originated
the “subplantation model” describing the growth of films
from energetic species (such species are the basis of modern film
deposition techniques). Between 1989 and 2001 he was the founding
head of the space technology center of Soreq which is a national center
of knowledge supporting the Israeli Space Industry in all aspects
related to the compatibility of materials, electronic devices and
systems to the space environments. Since 1999 he is an adjunct professor
at City University Hong Kong and a frequent visiting professor there.
Between 2001 and 2003 he was a chair professor of materials science
at the department of physics and materials science of City University
Hong Kong (eminent professors program). He joined the Technion as
a full professor on November 2004. Professor Lifshitz is a member
of the organizing committees and an invited speaker of the major international
conferences in diamond and related materials and in materials in space.
Our group is involved in nanostructuring of inorganic materials
in two fundamental approaches: (1) self assembly of nanostructures
of silicon and other semiconducting materials by CVD methods (laser
ablation and thermal CVD), (2) nanostructuring novel materials
(e.g. carbon, MoS2, WS2) by energetic species.
Our study of self assembly of nanostructures of silicon and
other semiconducting materials aims at the controlled growth
of these nanostructures, the elucidation of the growth mechanisms
and the establishment of the correlation between size/structure/morphology
and the related properties which is the essence of nanoscience.
Such nanostructures (0D – nanospheres connected to chains,
1D – nanowires, 2D – nanoribbons) are expected to
serve as building blocks for future electronic and optical devices.
They will be explored in our group as building blocks of physical,
chemical and biological sensors.
The study of nanostructuring novel materials (e.g. carbon,
MoS2, WS2) by energetic species is based
on the idea that deposition using energetic species is a “nano-high-pressure-high-temperature” technique in which the bombarded matrix serves as a nano-high-pressure
cell and the species energy is equivalent to high temperature.
By applying energetic species and playing around with the species
type, energy and target temperature we expect to be able to form
exotic metastable structures (some of which are known from high
pressure high temperature experiments in massive systems which
produce powders of these phases) in thin films, that will be applicable
for electronic and mechanical utilizations. Our source of energetic
species will be a filtered vacuum cathodic arc system incorporated
to a 350keV ion implanter. One example of films we will produce
is fullerinelike films of carbon, MoS2 and WS2.
CURRENT RESEARCH PROJECTS
- Multifunctional
nanosensors from semiconducting materials
- Nanowires
of silicon and other semiconducting materials for electrical and optical
applications
- Nanostructuring
of novel carbon forms via relaxation processes in amorphous carbon
films
- Controlled
growth, growth mechanisms and properties of novel nanostructures of
silicon and other semiconducting materials
SELECTED
PUBLICATIONS
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Y.
Lifshitz, "Carbon forms Structured by Energetic Species: Amorphous,
Nanotubes, and Crystalline", The Dekker Encyclopedia of
Nanoscience and Nanotechnology, pp. 415 – 424, 2004.
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J.A. Zapien, Y. Jiang, X.M. Meng, W. Chen, F.C.K. Au, Y. Lifshitz
, & S.T. Lee, “Room-Temperature Single Nanoribbon Lasers”,
Appl. Phys. Lett., 84(7) 1189, 2004.
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Y. Lifshitz, X. M. Meng, S.T. Lee, R. Akhveldiany and A. Hoffman,
“Visualization of Diamond Nucleation and Growth from Energetic
Species”, Phys. Rev. Lett., 93(5),
56101, 2004.
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W.J. Zhang, I. Bello, Y. Lifshitz, K.M. Chan, X.M. Meng, Y. Wu,
C.Y. Chan, S.T. Lee, “Epitaxy on Diamond – The route
to high quality single crystalline cBN for electronic applications”,
Advanced Materials, 16(16), 1405, 2004.
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S.T. Lee, Y. Lifshitz, “The road to diamond wafers”,
Nature, 424, 500, 2003.
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R.Q. Zhang, Y. Lifshitz, S.T. Lee, “Oxide assisted growth
of silicon nanowires”, Advanced Materials 7-8,
635, 2003.
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D.D.D. Ma, C. S. Lee, Y. Lifshitz and S. T. Lee “Periodic
array of intramolecular junctions of silicon nanowires”, Appl.
Phys. Lett., 81(17), 3233, 2002.
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Y. Lifshitz, Th. Köhler, Th. Frauenheim, I. Guzmann, A. Hoffman,
R.Q. Zhang, X.T. Zhou, S.T. Lee, “The mechanism of diamond
nucleation from energetic species”, Science, 297,
1531, 2002.
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Y. Lifshitz, X. F. Duan, N. G. Shang, Q. Li, L. Wan, I. Bello &
S. T. Lee, “Nanostructuring: Diamond Polytypes Grown Epitaxially
on Silicon”, Nature, 412, 404, 2001.
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H.Y. Peng, N. Wang, Y.F. Zheng, Y. Lifshitz, J. Kulik, R.Q. Zhang
C. S. Lee and S.T. Lee, “Smallest Diameter Carbon Nanotubes”,
Appl. Phys. Lett., 77(18), 2831, 2000.
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S. T. Lee, H.Y. Peng, X. T. Zhou, N. Wang, C. S. Lee, Y. Lifshitz,
“A Nucleation Site and Mechanism Leading to Epitaxial Growth
of Diamond Films”, Science, 287,
104, 2000.
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Y. Lifshitz, “Diamondlike carbon - Present Status”,
Diamond & Rel. Mater., 8, 1659, 1999.
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S. Uhlmann, Th. Frauenheim, Y. Lifshitz, “Molecular Dynamics
Study of the Fundamental Processes Involved in Subplantation of
Diamondlike Carbon”, Phys. Rev. Lett, 81(3),
641, 1998.
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Y. Lifshitz, G.D. Lempert, E. Grossman, "Substantiation of
Subplantation Model for Diamondlike Film Growth from Energetic Specires
by Atomic Force Microscopy", Phys. Rev. Lett., 72
(17), 2753, 1994.
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Y. Lifshitz, S.R. Kasi and J.W. Rabalais, "Subplantation Model
for Film Growth From Hyperthermal Species: Application to Diamond",
Phys. Rev. Lett., 62, 1290, 1989.
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