Shrinwantu Pal - Semiconductor to metal transition in SWNTs caused by interaction with gold and platinum nanoparticles

Version 1

      Publication Details (including relevant citation   information):

      Single-walled carbon nanotubes (SWNTs) have been coated with gold   and platinum nanoparticles either by microwave treatment or by   the click reaction. The Raman spectra of these SWNT–metal   nanoparticle composites have been investigated. Analysis of the G   bands in the Raman spectra shows an increase in the proportion of   metallic SWNTs attached to metal nanoparticles. This conclusion   is also supported by the changes observed in the radial breathing   mode (RBM) bands. Ab initio calculations reveal that   semiconductor–metal transition occurs in SWNTs due to Coulombic   charge transfer between the metal nanoparticles and the   semiconducting SWNTs.

      Abstract:

      Single-walled carbon nanotubes (SWNTs) have been coated with gold   and platinum nanoparticles either by microwave treatment or by   the click reaction. The Raman spectra of these SWNT–metal   nanoparticle composites have been investigated. Analysis of the G   bands in the Raman spectra shows an increase in the proportion of   metallic SWNTs attached to metal nanoparticles. This conclusion   is also supported by the changes observed in the radial breathing   mode (RBM) bands. Ab initio calculations reveal that   semiconductor–metal transition occurs in SWNTs due to Coulombic   charge transfer between the metal nanoparticles and the   semiconducting SWNTs.

      Address (URL): http://iopscience.iop.org/0953-8984/20/21/215211