Subramaniam, Chandramouli and Sreeprasad, T. S. and Pradeep, Thalappil and Kumar , G. V. Pavan and Narayana, Chandrabhas and Chakrabarti, J (2007) Visible Fluorescence Induced by the Metal Semiconductor Transition in Composites of Carbon Nanotubes with Noble Metal Nanoparticles. Physical Review Letters, 99 (16). p. 167404.
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We show that single-walled carbon nanotube (SWNT) bundles emit visible fluorescence in the presence of noble metal nanoparticles and nanorods in the solid state. Conductivity measurements with metallic nanotubes, isolated from pristine SWNTs, show that they become semiconducting in the presence of the metal nanoparticles. Nanoparticle binding increases the defects in the nanotube structures which is evident in the Raman spectra. The metal-semiconductor transition removes the nonradiative decay channels of the excited states enabling visible fluorescence. Nanotube structures are imaged using this emission with resolution below the classical limits.
|Subjects:||Material Science > Nanochemistry|
Material Science > Nanostructured materials
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Chemistry|
|Deposited On:||02 Apr 2009 10:46|
|Last Modified:||08 May 2009 13:04|
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