NDSU Calendar

Monday, December 3, 2012
4:00pm
Chemistry & Biochemistry Department Seminar (Conference/Workshop/Seminar)

Dorothee Vinga Szabo, Karlsruhe Institute of Technology, Institute for Applied Materials, Germany, will present a seminar entitled, "Nanoparticles for Energy Relevant Applications: Li-ion Battery and Dye-Sensitized Solar Cells".
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Abstract:
Nanoparticles have experienced a rapid development in the recent years due to their existing and/or potential applications in a wide field of technological areas such as electronics, senor technology, catalysis, biology, or diagnostics and recently also in Li-ion batteries or dye-sensitized solar cells. This seminar will cover different aspects of nanoparticles and nanomaterials.

Nanoparticles are characterized by some interesting physical or chemical properties, being properties of single, isolated particles. In many cases the properties additionally depend on particle size (e.g. superparamagnetism, fluorescence, thermodynamic properties). They often differ significantly from properties of their bulk counterparts of the same chemical composition. This is amongst others because a 5 nm particle consists of only a few thousand atoms, leading to a high surface to volume ratio. The smaller the particles are, the higher the surface to volume ratio.

The Karlsruhe Microwave Plasma Process is a gas phase process where nanoparticles with sizes in the range from 2 to 10 nm can be synthesized exhibiting very narrow particle size distribution. Due to the physics of the process, the reaction temperatures can be set quite low (<700 degrees C). The particle size can be adjusted to some extent in dependency of experimental parameters (microwave power, gas pressure, or precursor concentration). A special experimental setup allows the in-situ deposition of nanoparticles directly on substrates (e.g. glass, Ni, Si), so that porous nanoparticle layers are generated. A highly sophisticated complementary analytics is necessary to characterize the particles and the layers.

Finally, two application relevant examples, namely the development of SnO2 and Sn based materials as interesting anode material for Li-ion batteries and the development of TiO2-based anode materials for dye-sensitized solar cells will be discussed in details. Results of microstructural investigation, chemical analysis and electrochemical characterization of materials developed in my group will be presented. The improvements gained with respect to the application relevant properties for Li-ion batteries, especially on cycling behavior, and respectively a proof of concept for the dye-sensitized solar cell will be shown.
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Everyone is welcome!
More information...
Location: Ladd 107
Price: Free
Host: Chemistry & Biochemistry Department
Contact: Wendy J. Leach
E-Mail: wendy.leach@ndsu.edu

(701) 231-8694

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