In situ and real time determination of metallic and semiconducting single-walled carbon nanotubes in suspension via dielectrophoresis | Zendy

Natacha Mureau | Zendy; Ernest Mendoza | Zendy; S. Ravi P. Silva | Zendy; Kai F. Hoettges | Zendy; Michael Hughes | Zendy

Open Access

In situ and real time determination of metallic and semiconducting single-walled carbon nanotubes in suspension via dielectrophoresis

Author(s) -

Natacha Mureau,

Ernest Mendoza,

S. Ravi P. Silva,

Kai F. Hoettges,

Michael Hughes

Publication year - 2006

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.2207501

Subject(s) - carbon nanotube , dielectrophoresis , materials science , suspension (topology) , raman spectroscopy , nanotechnology , metal , absorption (acoustics) , analytical chemistry (journal) , composite material , optics , chemistry , chromatography , microfluidics , metallurgy , physics , mathematics , homotopy , pure mathematics

We report an alternative method combining dielectrophoresis and impedance spectroscopy to provide rapid, accurate measurement of dielectrophoretic collection of single-walled carbon nanotubes (SWNTs) in real time. We analyzed a Triton X-100 suspension of mixed SWNTs to measure their precise dielectrophoretic collection behavior. Results indicate that our sample contains 21.5% of metallic and 78.5% of semiconducting carbon nanotubes before separation, and that the range of 1–15MHz is ideal to collect only the metallic ones. Optical absorption was used to confirm these proportions. We discuss the possible errors associated with using purely a Raman technique to validate the type of SWNTs collected in suspension.

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