Nanofabrication and characterization of ZnO nanorod arrays and branched nanorods for device applications

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Nanofabrication and characterization of ZnO
nanorod arrays and branched nanorods for device
applications
Academy of Sciences of Moldova
Oleg LUPAN Technical University of Moldova, MD
2004 Chisinau, Moldova University of Central
Florida, Orlando, FL 32816
lupan_at_physics.ucf.edu lupan_at_mail.utm.md
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Collaborations with the UCF Teams
Equipment available at the UCF and MCF
Synthesis and advising Dr. Lee
Chow MCF - XRD, FIB device fabrication Dr. G.
Chai
XPS Dr. B. Roldan, Dr.
A. Naitabdi
Micro-Raman Dr. A. Schulte, S. Park
CL spectra Dr. L. Chernyak, L.
Lopatiuk-Tirpak
TEM Dr. Helge Heinrich
SEM, EDX Dr. G. Chai,
H. Khallah
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Collaborations with the Moldova Teams
Technical University of Moldova
Technical University of Moldova
MD. Scintific advising Prof. Dr.hab. T.
Shishiyanu RPP, Hall
Dr. S. Shishiyanu Gas sensitivity
Prof. Dr. V. Sontea Characterizations
Dr. S. Railean
Academy of Sciences of Moldova
PL Dr. Hab. V. Ursaki, Institute of
Applied Physics, MD Acad. I.
Tigineanu, Academy of Sciences of Moldova
National Center for Materials Study and Testing
EDX, SEM PhD. E. Monaico, NCMST, TUM, Moldova
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Introduction and Motivation
Nanofabrication and characterization of ZnO
nanorod arrays and branched nano/microrods for
device applications
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• ZnO is a key functional material exhibiting
• near-ultraviolet emission ,
• transparent conductivity
• semiconducting, magnetic, and piezoelectric
  properties.
• It has a
• wide direct band gap (3.37 eV),
• large exciton binding energy (60 meV)
• excellent chemical, mechanical, and thermal
  stability 1, 2
• Zinc oxide has extensive commercial use during
  the past 100 years 3 in
• optoelectronics
• nano/microelectronics
• sensors, transducers,
• hydrogen storage material and
• biomedicine.
• ZnO is a phosphor materials with ability to
  retain a high efficiency, even
• at low-voltage excitation 18.

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Introduction and Motivation
Department of PhysicsUniversity of Central
Florida
Department of MicroelectronicsTechnical
University of Moldova
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• Nanostructures,
• -gt nanorods, -gt nanowires, -gt nanotubes, -gt
  nanobelts,
• have attracted extraordinary attention for their
  potential applications in device and
• interconnect integration in nanoelectronics and
• molecular electronics.
• Control the
• particle size morphology of nanostructures
• is of crucial importance from a fundamental and
  industrial point of view

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Device Fabricationsat the MCF, UCF
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In-situ lift-out fabrication and
characterizations of ZnO branched nanorods -
based nano/microsensors
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Conclusions
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• The nanorod arrays and branched chemical
  deposited zinc oxide as
• gas sensors
• solar cells.
• The merit of this technology is in
• simplicity of the process,
• economy in energy,
• structures with high efficiency,
• short duration,
• energy save,
• accessible auxiliary materials
• nonsophisticated equipment.

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Conclusions
By this technique has been fabricated different
shaped-nanosensors preliminary investigated
their gas sensitivity to H2, O2, oxygen partial
pressure, UV sensitivity, relative
humidity, alcohol and ammonia gases.
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Future work
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• We plan further investigations
• with different dopants and second
  components in ZnO, etc architectures
• 
  are underway
• other nanoarchitectures nanostructures
• multilayer structures
• Nanorod p-n junctions!!!!! devices
• for sensor high-tech applications of
  nanostructured metal oxide material devices

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Acknowledgements
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• This work described here was made possible in
  part by an
• Award No.MTFP-1014 for young researchers
• of the Moldovan Research and Development
  Association
• under the funding from the U.S. Civilian
  Research and Development Foundation (CRDF) with
  support from
• U.S. Department of State

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Acknowledgements
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• Financial support by the Project 321b/s from the
  Ministry of Education and Science of Moldova,
• and Project 032P from Supreme Council for
  Research and Technological Development of the
  Academy of Sciences of Moldova
• are gratefully acknowledged.

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Publications - Dr. LUPAN Oleg et.al.
Jan-May-2007
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• 1 O. Lupan, G. Chai, L. Chow, "Hydrogen
  nanosensor on single nanorod" US patent pending,
  May, 2007.
• 2 S. Shishiyanu, T. Shsishiyanu, O. Lupan Gas
  sensor" MD patent registered 4639 and pending,
  May, 2007.
• 3 O. Lupan, L. Chow, SYNTHESIS AND
  CHARACTERIZATIONS OF ZnO NANORODS ARRAYS FOR
  SOLAR CELL AND CHEMICAL SENSOR APPLICATIONS,
  Proceedings of NSTI Nanotechnology Conference and
  Trade Show, May 20-24, 2007, Santa Clara,
  California, U.S.A., ISBN 1420063766 Vol. 4, pp.
  457-460.
• 4 O.Lupan, L. Chow, S. Shishiyanu, V. Ursaki,
  E. Monaico, T. Shishiyanu, B. Roldan, A.
  Naitabdi, A. Schulte, S. Park, Nanostructured
  zinc oxide synthesized by successive chemical
  solution deposition for solar cells and gas
  sensor applications, submitted to Materials
  Research Bulletin, April 2007.
• 5 V. V. Ursaki, O. Lupan, L. Chow, I. M.
  Tiginyanu, V. Zalamai, Rapid thermal annealing
  induced change of the mechanism of multiphonon
  resonant Raman scattering from ZnO nanorods,
  submitted April, 2007, accepted Solid State
  Communications.
• Other 5 submitted Papers to International
  peer-review Journals

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2 accepted Poster Papers accepted and Presented
by Dr. LUPAN Oleg 20-24 May-2007

• NSTI Nanotechnology Conference and Trade Show,
  May 20-24, 2007, Santa Clara, California, U.S.A.,
  ISBN 1420063766 Vol. 4, pp. 457-460

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Young generation of engineers and scientists in
USA
Moldova

• Undergraduate students (4)
• MSc (1)
• Graduate students or PhD students(3)

Questions???
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Q A, please ? !
Thank You !!!
lupan_at_physics.ucf.edulupanoleg_at_yahoo.com