Thursday, January 24, 2008, 11:00 am — Bldg. 735 - Conf. Rm. B
Single-walled carbon nanotubes (SWNTs) are a promising class of molecules for opto-electronic devices including solar cells and bio-imaging. Energy transfer between coupled nanotubes offers exciting new possibilities for optimized light harvesting and overcoming low quantum yields. Signatures of inter-tube energy transfer are identified using photoluminescence (PL) spectroscopy of single-walled carbon nanotube ensembles. Resonant photo-excitation of large bandgap SWNTs produces strong PL emission from smaller bandgap SWNTs. Magnetic alignment measurements associate these energy transfer PL peaks with the formation of SWNT bundles, suggesting that efficient coupling results from close physical contact. Time permitting I will also discuss preliminary results on anomalous low magnetic field effects on SWNTs.
Hosted by: Chuck Black
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