000079732 001__ 79732 000079732 005__ 20200117221612.0 000079732 0247_ $$2doi$$a10.1063/1.5043544 000079732 0248_ $$2sideral$$a107629 000079732 037__ $$aART-2018-107629 000079732 041__ $$aeng 000079732 100__ $$0(orcid)0000-0001-6152-6784$$aLajaunie, L. 000079732 245__ $$aOptoelectronic properties of calcium cobalt oxide misfit nanotubes 000079732 260__ $$c2018 000079732 5060_ $$aAccess copy available to the general public$$fUnrestricted 000079732 5203_ $$aWe report on the optoelectronic properties of a recently discovered nanotubular phase of misfit-layered calcium cobalt oxide, CaCoO2-CoO2. Individual nanotubes are investigated by spatially resolved electron energy-loss spectroscopy experiments performed in a transmission electron microscope, and complementary first-principles, time-dependent hybrid density-functional theory calculations are performed to elucidate the electronic structure and optical spectra. We find that the band gap is independent of the geometry of the nanotubes, and experimental and calculated results independently confirm an optical gap of 1.9-2.1 eV for the CaCoO2-CoO2 nanotubes. The time-dependent hybrid density-functional theory calculations also suggest the existence of strongly bound intralayer excitons (up to 0.5 eV binding energy), which could allow for optoelectronic applications of these nanotubes at near-infrared to visible (~1.5-2 eV) wavelengths. 000079732 536__ $$9info:eu-repo/grantAgreement/EC/H2020/696656/EU/Graphene-based disruptive technologies/GrapheneCore1$$9This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 696656-GrapheneCore1$$9info:eu-repo/grantAgreement/EC/H2020/785219/EU/Graphene Flagship Core Project 2/GrapheneCore2$$9This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 785219-GrapheneCore2$$9info:eu-repo/grantAgreement/ES/MINECO/MAT2016-79776-P 000079732 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/ 000079732 590__ $$a3.521$$b2018 000079732 591__ $$aPHYSICS, APPLIED$$b31 / 148 = 0.209$$c2018$$dQ1$$eT1 000079732 592__ $$a1.331$$b2018 000079732 593__ $$aPhysics and Astronomy (miscellaneous)$$c2018$$dQ1 000079732 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000079732 700__ $$aRamasubramaniam, A. 000079732 700__ $$aPanchakarla, L.S. 000079732 700__ $$0(orcid)0000-0002-2071-9093$$aArenal, R.$$uUniversidad de Zaragoza 000079732 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada 000079732 773__ $$g113, 3 (2018), 031102$$pAppl. phys. lett.$$tAPPLIED PHYSICS LETTERS$$x0003-6951 000079732 8564_ $$s123657$$uhttps://zaguan.unizar.es/record/79732/files/texto_completo.pdf$$yVersión publicada 000079732 8564_ $$s115309$$uhttps://zaguan.unizar.es/record/79732/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000079732 909CO $$ooai:zaguan.unizar.es:79732$$particulos$$pdriver 000079732 951__ $$a2020-01-17-21:48:58 000079732 980__ $$aARTICLE