2021
DOI: 10.1073/pnas.2109945118
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Asymmetric misfit nanotubes: Chemical affinity outwits the entropy at high-temperature solid-state reactions

Abstract: Asymmetric two-dimensional (2D) structures (often named Janus), like SeMoS and their nanotubes, have tremendous scope in material chemistry, nanophotonics, and nanoelectronics due to a lack of inversion symmetry and time-reversal symmetry. The synthesis of these structures is fundamentally difficult owing to the entropy-driven randomized distribution of chalcogens. Indeed, no Janus nanotubes were experimentally prepared, so far. Serendipitously, a family of asymmetric misfit layer superstructures (tubes and fl… Show more

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Cited by 12 publications
(22 citation statements)
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“…The high temperature of the reaction, though, leads to a random distribution of the sulfur and selenium in the lattice (see Figure b). However, in one recent case, misfit nanotubes of the kind LaS–TaSe 2 and LaS–(TaSe 2 ) 2 with a highly asymmetric structure and large (local) dipole moment were produced, by careful control of the S/Se ratio as well as the other reaction parameters . Notwithstanding the high temperature of the reaction (825–1100 °C), the large reaction enthalpy drove it to a highly selective and specific path leading to such asymmetric nanotubes.…”
Section: Introductionmentioning
confidence: 99%
“…The high temperature of the reaction, though, leads to a random distribution of the sulfur and selenium in the lattice (see Figure b). However, in one recent case, misfit nanotubes of the kind LaS–TaSe 2 and LaS–(TaSe 2 ) 2 with a highly asymmetric structure and large (local) dipole moment were produced, by careful control of the S/Se ratio as well as the other reaction parameters . Notwithstanding the high temperature of the reaction (825–1100 °C), the large reaction enthalpy drove it to a highly selective and specific path leading to such asymmetric nanotubes.…”
Section: Introductionmentioning
confidence: 99%
“…In addition to the regular (00 l ) peaks with periodicities of 11.3 Å, the XRD pattern exhibits weaker reflections with periodicities of 17.2 Å, typical for the ( O – T – T ) superstructure. 37 Indeed the purely ( O – T – T ) order in a nanotube/flake generates a new compound, i.e., (SmS) 1.19 (TaS 2 ) 2 . Here, the ( O – T – T ) order was interspersed, sporadically, between the ( O – T ) superstructure and was probably caused by the defects in the SmS unit.…”
Section: Resultsmentioning
confidence: 99%
“…Generally, the confined volume and curvature of the nanotubes confer larger density of defects than the flakes. 37 Moreover, the fact that each layer in the MLC nanotube contains a different number of atoms induces strain, which can be relaxed via defect formation. Figure 3c− Figure 4a,b and Figure S5 show HR-STEM-BF images and exploded views of a lamella from a different region of the same nanotube.…”
Section: ■ Results and Discussionmentioning
confidence: 99%
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