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Issue 5, 2011
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Evaluation of metallic and semiconducting single-walled carbon nanotube characteristics

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Abstract

The nature of the mixed electronic type metallic (M-) and semiconducting (S-) single-walled carbon nanotubes (SWNTs) synthesized by current methods has posed a key challenge for the development of high performance SWNT-based electronic devices. The precise measurements of M- to S-SWNT ratio in as-grown or separated samples are of paramount importance for the controlled synthesis, separation and the realization of various applications. The objective of this review is to provide comprehensive overview of the progress achieved so far for measuring the M/S ratio both on individual and collective levels of SWNT states. We begin with a brief introduction of SWNT structures/properties and discussion of the problems and difficulties associated with precise measurement of the M/S ratio, and then introduce the principles for obtaining distinguished signals from M-and S-SWNTs. These techniques are classified into different groups based either on the single/ensemble detection of SWNT samples or on the principles of techniques themselves. We then present the M/S ratio evaluation results of these methods, with emphasis on scanning probe microscopy (SPM)-based detection techniques. Finally, the prospects of precise and large-scale measurement of M/S ratio in achieving controlled synthesis and understanding growth mechanism of SWNTs are discussed.

Graphical abstract: Evaluation of metallic and semiconducting single-walled carbon nanotube characteristics

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Publication details

The article was received on 07 Dec 2010, accepted on 20 Jan 2011 and first published on 08 Mar 2011


Article type: Review Article
DOI: 10.1039/C0NR00958J
Citation: Nanoscale, 2011,3, 2074-2085
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    Evaluation of metallic and semiconducting single-walled carbon nanotube characteristics

    B. Wu, D. Geng and Y. Liu, Nanoscale, 2011, 3, 2074
    DOI: 10.1039/C0NR00958J

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