Rajay Kumar

Raman Spectroscopy of Carbon Nanotubes under Axial Strain

Raman Spectroscopy of Carbon Nanotubes under Axial Strain and Surface-Enhanced Raman Spectroscopy of Individual Carbon Nanotubes

• Broschiertes Buch

Produktbeschreibung

Resonant Raman spectroscopy of individual carbon
nanotube bundles under axial strains up to 17% are
presented. This strain causes nanotube debundling
which gives insight into the nature of the broad
metallic G- band. For metallic nanotubes, the G- band
upshifts and narrows with strain, making it appear
more semiconductor-like. This metal to semiconductor
transition is irreversible with strain, indicating
that nanotube-nanotube coupling plays a significant
role in the observed G- band of metallic nanotubes.
The vibrational and
electronic properties of these nanotubes under strain
are modeled using tight-binding
calculations.
A systematic study of surface enhanced Raman
spectroscopy (SERS) of carbon nanotubes. Raman
spectra of individual carbon nanotubes are measured
before and after depositing silver nanoparticles.
Regions exhibiting SERS enhancement were located
relative to a grid, allowing subsequent scanning
electron microscopy to be performed. SERS enhancement
factors up to 134,000, a consistent upshift in the G
band Raman frequency and nanoparticle heating in
excess of 600°C are revealed.

Produktdetails

• Verlag: VDM Verlag Dr. Müller
• Seitenzahl: 180
• Englisch
• Abmessung: 220mm x 150mm x 9mm
• Gewicht: 255g
• ISBN-13: 9783639080834
• ISBN-10: 3639080831
• Artikelnr.: 26083317

Autorenporträt

Rajay Kumar graduated from MIT with a B.S. and M.Eng. in
Electrical Engineering in 2003, working under Professor Marc
Baldo. In 2008, he earned his Ph.D. from USC, working under
Professor Stephen Cronin. His research includes the Raman
spectroscopy of carbon nanotubes under axial strain and
investigating surface-enhanced Raman spectroscopy (SERS).