Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 109, Issue 24, Pages 9309-9313Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1200342109
Keywords
electric tweezers; nanoparticles; manipulation
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Funding
- National Science Foundation (NSF) [DMR05-20491, DMR 0706178]
- Welch Foundation [F-1734]
- National Institutes of Health [1R41EB012885-01]
- University of Texas
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Direct electric measurement via small contacting pads on individual quasi-one-dimensional nanoentities, such as nanowires and carbon nanotubes, are usually required to access its electronic properties. We show in this work that 1D nanoentities in suspension can be driven to rotation by AC electric fields. The chirality of the resultantrotation unambiguously reveals whether the nanoentities are metal, semiconductor, or insulator due to the dependence of the Clausius-Mossotti factor on the material conductivity and frequency. This contactless method provides rapid and parallel identification of the electrical characteristics of 1D nanoentities.
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