“Atomistic Alloy Disorder in Nanostructures”
Wednesday, February 7, 2007
2:00 PM
EE 317
Gerhard Klimeck, Technical Director, NCN
Professor, Electrical and Computer Engineering
Purdue University
SEE ATTACHED FLYER FOR DETAILS.
“Introduction to X-ray Photoelectron Spectroscopy and
XPS Application for Biologically Related Objects”
Thursday, February 8, 2007
10:30 AM
Birck Nanotechnology Building, Room 1001
Dimitry Zemlyanov, Surface Science Application Scientist
Birck Nanotechnology Center, Purdue University
X-ray Photoelectron Spectroscopy (XPS), which is known as Electron
Spectroscopy for Chemical Analysis (ESCA), is a powerful research
tool for the study of the surface of solids. The technique becomes
widely used for studies of the properties of atoms, molecules,
solids, and surfaces. The main success of the XPS technique is
associated with studies of the physical and chemical phenomena on the
surface of solids. These investigations were limited by relatively
simple inorganic reactions and not many biologically related objects
were approached by XPS. There are impartial reasons for low
involvement of XPS into investigations of biologically related
objects. First, organic chemistry samples often exhibit high vapor
pressure and therefore, degas badly in vacuum. This is not compatible
with XPS technique. Second, X-rays might cause radioactive damage of
a sample. Third, the C 1s region, which is most informative for
organic chemistry samples, is narrow and the photoemission peaks can
over crowd the region.
In this presentation, successful examples of XPS studies of bio-
related specimen will be presented. In particularly, the systematic
XPS investigation of four peptide-silane and peptide-silane hybrid
sol-gel thin films prepared under biologically benign conditions will
be reported. This work demonstrates a use for XPS to characterized
biologically inspired surfaces, providing critical information on
peptide coverage on the surface of the materials. The self-assembling
layer characterization will be considered on the examples of thiols
on Au and aryl diazonium molecules on Si (111).
Dmitry Zemlyanov received his Ph.D. in Physics and Mathematics from
the Novosibirsk State University, Russia. He is currently a Surface
Science Application Scientist at the Birck Nanotechnology Center and
is in charge of the Surface Analysis Facility at Birck. Earlier, he
was a postdoctoral researcher at the Fritz-Haber-Institute, Berlin,
at Worchester Polytechnic Institute, MA; an adjunct assistant
professor at the Physics Department, Worchester Polytechnic
Institute, MA, and a research fellow at Material and Surface Science
Institute, University of Limerick, Ireland. His research interests
include surface science, heterogeneous catalysis, surface phenomena.
SPONSORED BY:
Birck Nanotechnology Center, Bindley Bioscience Center, Discovery
Park, The NASA Institute for Nanoelectronics and Computing, The
Network for Computational Nanotechnology, VEECO, NCN Student
Leadership Council, Department of Chemistry, Department of Physics,
School of Chemical Engineering, School of Electrical and Computer
Engineering, School of Mechanical Engineering