Raman spectroscopy for probing chemically or physically induced phonon changes in carbon nanotubes

• Main Author: Soh, Gilbert Hanzhong.
• Other Authors: Zhang Qing
• Format: Final Year Project
• Language: English
• Published: 2009
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Nanoelectronics
• Online Access: http://hdl.handle.net/10356/18937
• Institution: Nanyang Technological University

Over the last ten years, carbon nanotubes have offered a unique system for the study of Raman spectra in one-dimensional systems, and at the same time Raman spectroscopy has provided a widely used and powerful tool for the characterization of single walled carbon nanotubes (SWNTs). Surface Enhanced Raman Scattering (SERS) is a surface sensitive technique that results in the enhancement of Raman scattering by the surface plasmons induced by some nanoparticles and nanostructures. Currently, this method has been comprehensively used to detect small Raman signals, or even a single molecule. The various types of Raman scattering processes relevant to carbon nanotubes are reviewed. The information that can be obtained from these scattering processes is also discussed. Effects of SERS are presented and a few factors that affect the SERS effect are reviewed. Experiments are conducted to determine the influence of these factors on the SERS effect. Carbon nanotube field effect transistor configuration is used for the experiments because it is easy to locate the carbon nanotubes and align their nanotube axis to perform Raman scattering. The Raman results from this device are in consistence with the theoretical results.