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Despite significant progress in carbon nanotube (CNT) synthesis by thermal chemical vapor deposition (CVD), the factors determining the structure of the resulting carbon filaments and other graphitic nanocarbons are not well understood. Here, we demonstrate that gas chemistry influences the crystal structure of carbon filaments grown at low temperatures (500°C). Using thermal CVD, we decoupled the...
A dense, micron-tall layer of carbon nanofibers (CNFs) was grown above a layer of carbon nanotubes (CNTs) during the same synthesis using a thick cobalt catalyst (15nm). The CNFs had large diameters (100nm) and were amorphous while the CNTs had small diameter (10–20nm) and were crystalline. Base growth mechanism was at play for both the nanofibers and the nanotubes. High-resolution transmission electron...
A large population of carbon nanotube field effect transistors (CNT-FETs), including a variety of channel morphologies with single and multiple tubes, was electrically characterized in atmospheric, ultra-high vacuum (UHV) and oxygen-rich environments. Devices were systematically classified according to the number and nature of the bridging CNTs based on a rigorous device characterization methodology...
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