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Thursday, April 21, 2011 10:45 a.m., NSERL 3.204

 

 

 

 

 

 

 

“Tuning Surface Properties by Chemical Functionalization”
Andrew Teplyakov, University of Delaware

Abstract
Surfaces and interfaces play an important role in the development of modern microelectronics, optoelectronics, biosensing and other technologies. This work will describe the approaches to tune the properties of interfaces, surfaces and subsurface layers of participating materials by chemical functionalization. Specifically, the amino-groups of a general formula NHx have been used in our group to control surface reactions on semiconductor surfaces, to promote deposition schemes on surfaces of thin solid diffusion barrier films and to provide reliable surface sites for biofunctionalization of self-assembled monolayers. In all of these cases, the reactivity of the amino-group can be designed to fit the required application. We will use selected temperature regimes, alkyl, aryl and other substituents to alter the reactivity of amino-terminated surfaces and to reversibly tune the properties of surface and subsurface layers in thin solid films and in “soft” self-assembled monolayers. We will also compare the amino-functionalized surfaces with more traditional substrates such as, for example, hydrogen-terminated semiconductor crystals. The preparation, analysis with multiple surface analytical microscopic and spectroscopic techniques, computational approaches to understanding surface reactivity, structure and stability of these aminofunctionalized surfaces and interfaces will be discussed.

Bio
Andrew Teplyakov is a professor of chemistry and biochemistry at the University of Delaware, which he joined in 1998. Prior to that he completed postdoctoral research at New York University, where he worked on the chemical properties of semiconductor surfaces. He earned his PhD in physical chemistry in 1997 from Columbia University. His primary research interests are molecular and microelectronics, semiconductor nanostructures and thin films, materials and structures for sustainable energy, the electronic properties of covalently bound chemical and biological systems on semiconductor substrates, and experimental and computational studies of surface chemical reactivity.