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Nat Nanotechnol. 2016 Jul;11(7):633-8. doi: 10.1038/nnano.2016.44. Epub 2016 Apr 4.

Wafer-scale monodomain films of spontaneously aligned single-walled carbon nanotubes.

Author information

1
Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA.
2
College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, Zhejiang 310058, China.
3
Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, USA.
4
Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
5
Department of Chemistry, Rice University, Houston, Texas 77005, USA.
6
Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA.

Abstract

The one-dimensional character of electrons, phonons and excitons in individual single-walled carbon nanotubes leads to extremely anisotropic electronic, thermal and optical properties. However, despite significant efforts to develop ways to produce large-scale architectures of aligned nanotubes, macroscopic manifestations of such properties remain limited. Here, we show that large (>cm(2)) monodomain films of aligned single-walled carbon nanotubes can be prepared using slow vacuum filtration. The produced films are globally aligned within ±1.5° (a nematic order parameter of ∼1) and are highly packed, containing 1 × 10(6) nanotubes in a cross-sectional area of 1 μm(2). The method works for nanotubes synthesized by various methods, and film thickness is controllable from a few nanometres to ∼100 nm. We use the approach to create ideal polarizers in the terahertz frequency range and, by combining the method with recently developed sorting techniques, highly aligned and chirality-enriched nanotube thin-film devices. Semiconductor-enriched devices exhibit polarized light emission and polarization-dependent photocurrent, as well as anisotropic conductivities and transistor action with high on/off ratios.

PMID:
27043199
DOI:
10.1038/nnano.2016.44
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