Quick search Find article
Quick search
Find article

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

Rakesh Voggu1, Shrinwantu Pal1, Swapan K Pati1,2 and C N R Rao1,3

Show affiliations


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.


PACS

64.70.Nd Structural transitions in nanoscale materials

73.22.-f Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals

61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)

61.46.Fg Nanotubes

71.15.-m Methods of electronic structure calculations

78.30.-j Infrared and Raman spectra

Subjects

Condensed matter: electrical, magnetic and optical

Nanoscale science and low-D systems

Condensed matter: structural, mechanical & thermal

Dates

Issue 21 (28 May 2008)

Received 12 February 2008, in final form 24 March 2008

Published 18 April 2008



  1. Semiconductor to metal transition in SWNTs caused by interaction with gold and platinum nanoparticles

    Rakesh Voggu et al 2008 J. Phys.: Condens. Matter 20 215211

  2. Charge renormalization, effective interactions, and thermodynamics of deionized colloidal suspensions

    A R Denton 2008 J. Phys.: Condens. Matter 20 494230

  3. Pulsed-field magnetization of drilled bulk high-temperature superconductors: flux front propagation in the volume and on the surface

    Gregory P Lousberg et al 2009 Supercond. Sci. Technol. 22 125026

  4. Origin of the colossal positive and negative thermal expansion in Ag3[Co(CN)6]: an ab initio density functional theory study

    Mark Calleja et al 2008 J. Phys.: Condens. Matter 20 255226

  5. Ab initio study on the thermal properties of the fcc Al3Mg and Al3Sc alloys

    Dong-Lin Li et al 2009 J. Phys. D: Appl. Phys. 42 225407

  6. Planar Metamaterial Microwave Absorber for all Wave Polarizations

    Zhu Bo et al 2009 Chinese Phys. Lett. 26 114102

  7. Analytic propagators for spin–orbit interactions

    Bailey C Hsu and Jean-François S Van Huele 2009 J. Phys. A: Math. Theor. 42 475304

  8. The influence of magnetic islands on drift mode stability in magnetized plasma

    H R Wilson and J W Connor 2009 Plasma Phys. Control. Fusion 51 115007

  9. On the generation of anomalous diffusion

    Iddo Eliazar and Joseph Klafter 2009 J. Phys. A: Math. Theor. 42 472003

  10. Dynamical decoherence control of multi-partite systems

    Goren Gordon 2009 J. Phys. B: At. Mol. Opt. Phys. 42 223001

View by subject




Export








Please login to access our web services, or create an account if you don't yet have one.

You must have cookies enabled in your web browser to be able to login.

Username
Password

Forgotten your password? Get a new one here.