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MSE Seminar - Professor Yu-Huang Wang, Department of Chemistry and Biochemistry, UMD
Friday, February 20, 2009
1:00 p.m.
Room 2108, Chemical and Nuclear Engineering Bldg.
For More Information:
Annette Mateus
301 405 5207

"Chemical Methods of Nanofabrication: From "Cloning" Carbon Nanotubes to Massively Parallel Dip-Pen Nanolithography"

This talk will focus on the synthesis of single-walled carbon nanotubes (SWNTs) and the patterning of nanostructures on surfaces. These problems not only underlie a wide range of potential applications in areas including nanoelectronics, energy and biomedical diagnostics, but they also have persistently challenged some of the limits of nanoscience and nanotechnology from the perspective of chemical synthesis, complex mixture separation and nanostructure characterization. In the case of SWNTs, there are hundreds of SWNT chiralities, each having a unique set of electrical, optical and chemical properties. The synthesis of a specific SWNT structure requires precise formation of a large number of carbon-carbon bonds in a tubular network-a single defect can change these properties significantly. A project focused on learning how to "clone" carbon nanotubes in a way reminiscent of molecular beam epitaxy will be discussed.

Chemically tailoring a surface on the sub-100 nm length scale represents an entirely different challenge in nanofabrication. I will present recent efforts in transforming dip-pen nanolithography (DPN), a high-resolution molecular printing technique, into a high throughput tool through the use of two-dimensional arrays consisting of as many as 55,000 AFM probes. These advances point towards the development of a "desktop fab" for custom fabrication of combinatorial arrays of soft/hard nanostructures that can be used for research topics ranging from fundamental surface science studies to nanoelectronics and biomedical diagnostics.

This Event is For: Public

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