Kumar, Rajay and Zhou, Hao and Cronin, Stephen B. (2007) Surface-enhanced Raman spectroscopy and correlated scanning electron microscopy of individual carbon nanotubes. APPLIED PHYSICS LETTERS, 91 (22).
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Official URL: http://link.aip.org/link/?APPLAB/91/223105/1
Raman spectra of individual carbon nanotubes are measured by scanning a focused laser spot (0.5 mu m diameter) over a large area (100 mu m(2)) before and after depositing silver nanoparticles. Local regions exhibiting surface enhanced Raman spectroscopy (SERS) were located with respect to a lithographically patterned grid, allowing subsequent scanning electron microscopy to be performed. The uniquely large aspect ratio of carbon nanotubes enables imaging of the nanoparticle geometry together with the SERS active molecule. By measuring the same individual carbon nanotube before and after metal nanoparticle deposition, the SERS enhancement factor is determined unambiguously. The data reveals SERS enhancement factors up to 134 000, a consistent upshift in the G band Raman frequency and nanoparticle heating in excess of 600 degrees C. (c) 2007 American Institute of Physics.
|Subjects:||Analytical Science > Microscopy and probe methods|
Material Science > Functional and hybrid materials
Physical Science > Nano objects
|Deposited On:||20 Jan 2009 11:37|
|Last Modified:||29 Jan 2009 16:41|
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