79732 20200117221612.0 doi 10.1063/1.5043544 sideral 107629 ART-2018-107629 eng (orcid)0000-0001-6152-6784 Lajaunie, L. Optoelectronic properties of calcium cobalt oxide misfit nanotubes 2018 Access copy available to the general public Unrestricted We report on the optoelectronic properties of a recently discovered nanotubular phase of misfit-layered calcium cobalt oxide, CaCoO2-CoO2. Individual nanotubes are investigated by spatially resolved electron energy-loss spectroscopy experiments performed in a transmission electron microscope, and complementary first-principles, time-dependent hybrid density-functional theory calculations are performed to elucidate the electronic structure and optical spectra. We find that the band gap is independent of the geometry of the nanotubes, and experimental and calculated results independently confirm an optical gap of 1.9-2.1 eV for the CaCoO2-CoO2 nanotubes. The time-dependent hybrid density-functional theory calculations also suggest the existence of strongly bound intralayer excitons (up to 0.5 eV binding energy), which could allow for optoelectronic applications of these nanotubes at near-infrared to visible (~1.5-2 eV) wavelengths. info:eu-repo/grantAgreement/EC/H2020/696656/EU/Graphene-based disruptive technologies/GrapheneCore1 This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 696656-GrapheneCore1 info:eu-repo/grantAgreement/EC/H2020/785219/EU/Graphene Flagship Core Project 2/GrapheneCore2 This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 785219-GrapheneCore2 info:eu-repo/grantAgreement/ES/MINECO/MAT2016-79776-P info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 3.521 2018 PHYSICS, APPLIED 31 / 148 = 0.209 2018 Q1 T1 1.331 2018 Physics and Astronomy (miscellaneous) 2018 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Ramasubramaniam, A. Panchakarla, L.S. (orcid)0000-0002-2071-9093 Arenal, R. Universidad de Zaragoza 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 113, 3 (2018), 031102 Appl. phys. lett. APPLIED PHYSICS LETTERS 0003-6951 123657 http://zaguan.unizar.es/record/79732/files/texto_completo.pdf Versión publicada 115309 http://zaguan.unizar.es/record/79732/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:79732 articulos driver 2020-01-17-21:48:58 ARTICLE