Nanotubes from Oxide-based Misfit Family: the case of Calcium Cobalt Oxide
Financiación H2020 / H2020 FundsFinanciación FP7 / Fp7 Funds
Resumen: Misfit layered compounds (MLCs) have generated significant interest in recent years as potential thermoelectric materials. MLC nanotubes could reveal behavior that is entirely different from the bulk material. Recently, new chemical strategies were exploited for the synthesis of nanotubular forms of chalcogenide-based MLCs, which are promising candidates for thermoelectric materials. However, analogous synthesis of oxide-based MLC nanotubes has not been demonstrated until now. Here, we report a chemical strategy for synthesis of cobalt-oxide-based misfit nanotubes. A combination of high-resolution (scanning) transmission electron microscopy (including image simulations), spatially resolved electron energy-loss spectroscopy, electron diffraction, and density functional theory (DFT) calculations is used to discover the formation of a phase within these nanotubes that differs significantly from bulk calcium cobaltite MLCs. Furthermore, DFT calculations show that this phase is semiconducting with a band gap in excess of 1 eV, unlike bulk calcium cobaltite MLCs, which are known to be metallic. Through systematic experiments, we propose a formation mechanism for these nanotubes that could also apply more generally to realizing other oxide-based MLC nanotubes.
Idioma: Inglés
DOI: 10.1021/acsnano.6b02430
Año: 2016
Publicado en: ACS Nano 10, 6 (2016), 6248-6256
ISSN: 1936-0851

Factor impacto JCR: 13.942 (2016)
Categ. JCR: CHEMISTRY, PHYSICAL rank: 5 / 145 = 0.034 (2016) - Q1 - T1
Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 4 / 87 = 0.046 (2016) - Q1 - T1
Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 9 / 166 = 0.054 (2016) - Q1 - T1
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 9 / 275 = 0.033 (2016) - Q1 - T1

Factor impacto SCIMAGO: 6.948 - Engineering (miscellaneous) (Q1) - Physics and Astronomy (miscellaneous) (Q1) - Nanoscience and Nanotechnology (Q1) - Materials Science (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/EC/FP7/312483/EU/Enabling Science and Technology through European Electron Microscopy/ESTEEM 2
Financiación: info:eu-repo/grantAgreement/EC/H2020/642742/EU/Graphene-based nanomaterials for touchscreen technologies: Comprehension, Commerce and Communication/Enabling Excellence
Financiación: info:eu-repo/grantAgreement/EC/H2020/696656/EU/Graphene-based disruptive technologies/GrapheneCore1
Financiación: info:eu-repo/grantAgreement/ES/MINECO/FIS2013-46159-C3-3-P
Tipo y forma: Article (PostPrint)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)

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