Raman Spectroscopy and Field Emission Measurements on Catalytically Grown Carbon Nanotubes

Abstract

We used microcontact printing to pattern a silicon surface with an iron-containing catalytic solution. Multi-wall carbon nanotubes were subsequently grown on the patterned areas by chemical vapor deposition at temperatures between 650 and 1000 • C. We demonstrate that the diameter of the catalytically grown multi-wall nanotubes increases with the deposition temperature. Raman spectroscopy has been used to investigate the crystalline character of the obtained structures and it is found that the fraction of the nano-crystalline shell increases with the temperatures. The measurement of the field emission properties shows a correlation between the tube diameter and the emission field values.

Synthesis and Characterization of Polyhedral Graphite Particles

“…1332, 1350, and 1598 cm -1 . The peak at ~1598 cm -1 (G band) corresponding to an E 2g mode of graphite is related to the vibration of sp 2 -bonded carbon atoms in a 2-D hexagonal lattice, while the peak at ~1350 cm -1 (D band) is related to the defects and disorders in the hexagonal graphitic layers [12]. In Fig.…”

Oxygen and light sensitive field-effect transistors based on ZnO nanoparticles attached to individual double-walled carbon nanotubes

“…• C using 2-phenyl ethanol showed similar ratio between the weak D peak (which stands for the relative amount of sp 3 hybridized carbon) at 1363 1/cm and the G peak (which represents the sp 2 hybridized carbon) at 1585 1/cm [55,56]. This let us assume that there is no substantial covalent functionalization of the pristine DWCNTs and upon ZnO attachment.…”

Theoretical calculations on the catalytic growth of multiwall carbon nanotube in chemical vapor deposition

“…It was noted that CNT growth did not begin immediately after the introduction of the hydrocarbon gas in the reactor, but that some carbonized spots appear before rapid CNT growth occurs [14]. Therefore, this shows that a certain quantity of carbon is dissolved in iron before the CNT growth starts.…”