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Joint Seminar

Confined Metals

Dr. Michael  Ruck

by: Dr. Michael Ruck

Date: Monday August 24, 2009

Time: 12:00 pm – 1:00 pm

Location: Houston Science Center – Building 593 — Room 102

Overview

Not available.

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Joint Seminar

An X-ray Vision of Structure-Function Relationships in Organic Electronics and Biointerfaces

Dr. Bert  Nickel

by: Dr. Bert Nickel

Date: Thursday May 08, 2008

Time: 4:00 pm – 5:00 pm

Location: Houston Science Center – Building 593 — Room 102

Overview

Organic molecules exhibit remarkable self-assembly properties which allow them to form highly organized thin film structures. A prominent example for such ultrathin films are lipid bilayers, which represent the structural backbone of cell membranes. Lipid bilayers can be deposited on various substrates ranging from optical resonators to semiconducting layers, permitting the addition of bioselectivity to such devices. I discuss how synchrotron x-ray based techniques can be used to access the structure of such hybrid systems. Another example to be discussed is molecular thin films for organic electronics. Here, I discuss how to determine details of the molecular arrangement, as well as the nature of structural defects, and how they relate to electronic device characteristics such as trap densities.

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Joint Seminar

Substitution Effects in Intermetallic Compounds

by: Prof. Thomas F. Faessler

Date: Friday April 04, 2008

Time: 11:00 am – 12:00 pm

Location: Houston Science Center – Building 593 — Room 102

Overview

Intermetallic compounds are fascinating with respect to their atomic structures and their electronic band structures. On the one hand atomic structures can be as simple as close packed arrays of atoms, and they can also reach a complexity with up to thousand atoms per unit cell (complex metallic alloys). On the other hand the electronic band structure in many cases offers particularities such as pseudo-gaps or high density of states at the Fermi level, which permits their applications in various fields of material sciences. As a borderline case semi-conducting Zintl phases gain increasingly influence in technological relevant materials. Fine tuning of atomic and electronic structures can be achieved by partial substitution of specific components of an intermetallic compound. In this context the effect on structural and electronic properties of atom by atom substitution is demonstrated by means of the systems KPb2-KBi2, BaSn3-BaBi3, mercury substitution in clathrate-I A8Ge44 and A8Sn44 (A = alkali metal), and zinc substitution in binary compound of the system Na-Sn. As a result the formation of complex structures containing atom clusters or long-range orders up to 100Ã… reveal as basic elements, as well as qualitative changes in the electronic properties.

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