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SSL Seminar Series 2002 No.8
Seminar series (3 topics)
Date: 29 November, 2002 (Friday)
Time: 3:00-4:00pm
Venue: Physics Resources Room, S13-02-16
Speaker: Dr. Alexander N. Obraztsov (Physics Department,
Moscow State University)
Title: Chemical Vapor Deposition of Thin Film Carbon Materials
in DC Discharge Plasma
Abstract:
A schema of CVD facility and the technology details for fabrication
thin film carbon materials will be presented in this report. Two
aspects of the CVD method were studied comparatively at different
process parameters: (i) DC discharge plasma activated hydrogen-methane
gas mixture and (ii) deposited carbon films. For the purposes of
plasma characterization we use in-situ measurements of electrical
parameters of the DC discharge and optical emission spectra. The
carbon CVD films were characterized in-situ by Raman spectroscopy
and ex-situ by a number of methods including Raman, SEM, TEM, AFM,
STM, Cathodoluminescence, Photoacoustics etc. The technologies for
fabrication of carbon film materials including polycrystalline and
nanocrystalline diamond, carbon nanotube, nanographite were elaborated.
Date: 02 December, 2002 (Monday)
Time: 3:00-4:00pm
Venue: Physics Conference Room, S13-M01-15
Title: Mechanism of Electron Emission from Carbon Materials
Abstract:
This report represents comparative analysis of FE properties of
different carbon materials including the thin films obtained by
using our original CVD methods. This analysis leads us to conclusion
that low-field electron emission from different carbon materials
has general mechanism related to their nano-structurization. The
experimental results supporting this idea were obtained by Cathodoluminescence,
Photoelectron spectroscopy, FE characterization and other methods.
Model of nano-carbon FE site and mechanism of FE from carbon related
materials are proposed.
Date: 04 December, 2002 (Wednesday)
Time: 3:00-4:00pm
Venue: Physics Conference Room, S13-M01-15
Title: Application of Carbon Cold Cathodes for Light Emitting
Devices
Abstract:
We develop a few type of lighting elements based on highly efficient
nano-carbon cold cathodes obtained by using our original CVD method.
This report represents schema of the lighting elements and their
light emission characteristics. Our analysis shows the highest efficiency
of energy transformation from electricity to light for the lamps
with cylindrical diode configuration. This efficiency is reached
up to 30% that is record value in comparison with other light sources.
The working prototypes of the lamps will be demonstrated. The possibilities
for application of developed lamps with nano-carbon cold cathodes
will be discussed.
About the Speaker:
Alexander N. Obsraztsoov graduated from Moscow State University
in 1981. He received his PhD of Science from Moscow State University
in 1986. He has worked as Professor in the Department of Electronic
and Photonic Systems Engineering, Kochi University of Technology
(Japan) since 2000. Currently, he is the Head of Laboratory of Carbon
Materials, Physics Department at Moscow State University. At the
current period of time the main field of his scientific interest
is nano-carbon materials growth, characterization and application
in vacuum electronic. It includes experimental and theoretical study
of nano-carbon materials fabrication, electron field emission properties,
development of vacuum electronic devices based on nano-carbon cold
cathodes. The field of interest includes also CVD growth of diamond
materials and their application for heat sinks, including CVD growth
of diamond films, thermal conductivity measurements.
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