Robinson, John M.
Hároz, Erik H.
Doorn, Stephen K.
Ajayan, Pulickel M.
Adams, W. Wade
Hauge, Robert H.
He, Xiaowei, Gao, Weilu, Xie, Lijuan, et al.. "Wafer-scale monodomain films of spontaneously aligned single-walled carbon nanotubes." Nature Nanotechnology, 11, (2016) 633-638. http://dx.doi.org/10.1038/nnano.2016.44.
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 (>cm2) 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 × 106 nanotubes in a cross-sectional area of 1 μm2. 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.
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Wafer-scale monodomain films of spontaneously aligned single-walled carbon nanotubes