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October 30th, 2007
Glowing future for nanotubes
Abstract:
A team of scientists from India and Japan have been the first to make a bundle of nanotubes glow, paving the way for their use as chemical sensors or in optoelectronics.
The researchers, led by Talappil Pradeep of the Indian Institute of Technology, Madras, bound gold nanoparticles to single walled carbon nanotubes (SWNTs), which can be either metallic or semiconducting depending on how the carbon atoms that make them up are arranged. The nanoparticles increased the number of defects in the metallic nanotubes, making the entire bundle semiconducting and able to fluoresce.1
'The metal-semiconductor transition enables visible fluorescence by removing the nonradiative decay channels from excited states,' Pradeep explained. 'The emission requires direct interaction of nanotubes with nanoparticles. It disappears when molecular spacers are introduced in between the nanoparticles and SWNTs.'
Source:
rsc.org
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