New Technology Applied to Make an Old Technology More Efficient

Dr. Bingqing Wei, ECE Assistant Professor, and colleagues have reported the fabrication and testing of light bulbs made from macroscopic single-walled and double-walled carbon nanotube filaments. The prospects for more efficient light bulbs could have a dramatic effect on every segment of society given the extent that this "everyday" item is used.
Their work "Carbon nanotube filaments in household light bulbs," (Applied Physics Letters, Vol. 84, No. 24, pp. 4869-4871, 14 June 2004) reports comparisons with bulbs containing tungsten filaments. The nanotube bulbs have lower threshold voltage and higher brightness at the same voltage when compared to their tungsten filament counterparts. Additionally, the resistance of the nanotube filaments did not change with temperature up to about 1750 degrees K. This means that the nanotube filaments could be used to make precision resistors that work at high temperatures.Review comments in Nature include, "Now carbon filaments might make a comeback, thanks to a discovery that bundles of carbon nanotubes provide robust filaments in household bulbs and have some advantages over tungsten."The site for Physics Web, , is an article discussing this research.Dr. Wei has published more than 120 papers in refereed international journals, including Nature and Science, in his field of interest "Carbon Nanotubes and Nanotechnology." These articles can be found at




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