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| 001 | 201766 | ||
| 005 | 20240610120452.0 | ||
| 024 | 7 | _ | |a 10.1021/ar400138h |2 doi |
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| 024 | 7 | _ | |a 1520-4898 |2 ISSN |
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| 100 | 1 | _ | |a Radovsky, Gal |0 P:(DE-HGF)0 |b 0 |
| 245 | _ | _ | |a Nanotubes from Chalcogenide Misfit Compounds: Sn–S and Nb–Pb–S |
| 260 | _ | _ | |a Columbus, Ohio |c 2014 |b American Chemical Soc. |
| 336 | 7 | _ | |a Journal Article |b journal |m journal |0 PUB:(DE-HGF)16 |s 1435559668_10713 |2 PUB:(DE-HGF) |
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| 336 | 7 | _ | |a article |2 DRIVER |
| 520 | _ | _ | |a Carbon fullerenes and nanotubes revolutionized understandingof the reactivity of nanoscale compounds. Subsequently, our group and others discovered analogous inorganic compounds with hollow, closed nanostructures. Such inorganic nanostructures offer many applications, particularly in the energy and electronics industries.One way to create inorganic nanostructures is via misfit layer-ed compounds (MLC), which are stacks of alternating two-dimensional molecular slabs, typically held together via weak van der Waals forces. They contain “misfits” in their a–b plane structures that can make them unstable, leading to collapse of the slabs into tubular nanostructures. For example, metal chalcogenide MLCs of the general formula (MX)1+y/TX2 (M = Sn, Pb, Bi, Sb, and other rare earths; T = Sn, Ti, V, Cr, Nb, Ta, etc.; X = S or Se) consist of a superstructure of alternating layers where the MX unit belongs to a (distorted NaCl) orthorhombic symmetry group (O), the TX2 layer possesses trigonal (T) or octahedral symmetry, and the two layers are held together via both van der Waals and polar forces. A misfit in the a axis or both a and b axes of the two sublattices may lead to the formation of nanostructures as the lattices relax via scrolling. Previous research has also shown that the abundance of atoms with dangling bonds in the rims makes nanoparticles of compounds with layered structure unstable in the planar form, and they tend to fold into hollow closed structures such as nanotubes.This Account shows that combining these two triggers, misfits and dangling bond annihilation in the slab rims, leads to new kinds of nanotubes from MLCs. In particular, we report the structure of two new types of nanotubes from misfits, namely, the SnS/SnS2 and PbS/NbS2 series. To decipher the complex structures of these nanotubes, we use a range of methods: high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS), selected area electron diffraction (SAED) analyses, scanning electron microscopy (SEM), and Cs-corrected scanning transmission electron microscopy (STEM) in the high-angle annular dark-field mode (HAADF). In both new types, the lattice mismatch between the two alternating sublayers dictates the relative layer-stacking order and leads to a variety of chiral tubular structures. In particular, the incommensuration (a type of misfit) of the SnS2/SnS system in both the (in plane) a and b directions leads to a variety of relative in-plane orientation and stacking orders along the common c-axis. Thus the SnS/SnS2 nanotubes form superstructures with the sequence O–T and O–T–T, and mixtures thereof. We also report nanotubes of the misfit layered compound (PbS)1.14NbS2, and of NbS2 intercalated with Pb atoms, with the chemical formula PbNbS2. Thus, the possibility to use two kinds of folding mechanisms jointly offers a new apparatus for the synthesis of unique 1-D nanostructures of great complexity and a potentially large diversity of physicochemical properties. |
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| 700 | 1 | _ | |a Popovitz-Biro, Ronit |0 P:(DE-HGF)0 |b 1 |
| 700 | 1 | _ | |a Stroppa, Daniel G. |0 P:(DE-HGF)0 |b 2 |
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| 700 | 1 | _ | |a Tenne, Reshef |0 P:(DE-HGF)0 |b 4 |e Corresponding Author |
| 773 | _ | _ | |a 10.1021/ar400138h |g Vol. 47, no. 2, p. 406 - 416 |0 PERI:(DE-600)1483291-4 |n 2 |p 406 - 416 |t Accounts of chemical research |v 47 |y 2014 |x 1520-4898 |
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