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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Narrowing SWNT diameter distribution using size-separated ferritin-based Fe catalysts.

Lukas Durrer1, Jason Greenwald, Thomas Helbling

  • 1Micro and Nanosystems, Department of Mechanical and Process Engineering, ETH Zürich, Zurich, Switzerland. lukas.durrer@micro.mavt.ethz.ch

Nanotechnology
|August 13, 2009
PubMed
Summary
This summary is machine-generated.

Fabricating single-walled carbon nanotubes (SWNTs) with controlled diameters is key for reproducible electronic devices. This study developed a method using size-selected ferritin catalysts for precise SWNT diameter control via chemical vapor deposition (CVD).

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Electrical probing of single-walled carbon nanotubes (SWNTs) relies on metal contacts, often forming Schottky barriers (SBs) at the interface.
  • SB heights can be tuned by metal workfunction and SWNT bandgap, which is inversely related to diameter.
  • Reproducible SWNT devices necessitate a narrow distribution of SWNT diameters.

Purpose of the Study:

  • To develop a method for fabricating SWNTs with large, adjustable mean diameters and narrow diameter distributions.
  • To improve the reproducibility of SWNT-based electronic devices.

Main Methods:

  • Utilizing ferritin nanoparticles as catalysts for chemical vapor deposition (CVD) growth of SWNTs.
  • Separating ferritin catalyst particles by size using sedimentation velocity centrifugation prior to CVD.
  • Characterizing SWNTs for mean diameter and diameter distribution.

Main Results:

  • Achieved SWNTs with a large and adjustable mean diameter ranging from 1.9 to 2.4 nm.
  • Demonstrated a very narrow diameter distribution of +/- 0.27 nm at a mean diameter of 1.9 nm.
  • Established a method for controlled SWNT synthesis crucial for device fabrication.

Conclusions:

  • Size separation of ferritin catalysts enables precise control over SWNT diameter and distribution.
  • This method offers a pathway to highly reproducible SWNT electronic devices.
  • Tailoring SWNT diameter is critical for optimizing contact properties, such as achieving Ohmic contacts.