Synthesis and Raman spectroscopy characterization of long Carbon Nanotubes



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Carbon Nanotubes (CNTs) are promising nanomaterials with outstanding thermal, electrical, and mechanical properties. Composed of carbon atoms arranged in thin cylindrical walls, these nanostructures have promising applications in nanoelectronics, ultra-strong fibers, and thermal management solutions. Chemical Vapor Deposition (CVD) has been used to grow CNTs from catalytical nanoparticles at low pressure and high temperatures. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) characterization of the structures of CNTs can potentially induce defects due to the high electron beam energy. This thesis reports an effort to establish Raman spectroscopy mapping as a relatively non-invasive technique for locating individual suspended and long single-walled carbon nanotubes (SWCNTs) grown by catalytic CVD before they are transferred for subsequent measurements of their thermal transport and other properties. The g-band and radial breathing mode in the Raman spectrum is used to identify SWCNTs and determine their diameters.


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