70884 20190709135529.0 doi 10.1016/j.carbon.2017.03.017 sideral 98565 ART-2017-98565 eng (orcid)0000-0001-5835-1223 Ortega-Liebana, M. Universidad de Zaragoza Uniform luminescent carbon nanodots prepared by rapid pyrolysis of organic precursors confined within nanoporous templating structures 2017 Access copy available to the general public Unrestricted Although several methods on the preparation of carbon nanodots (CNDs) emitting throughout the visible have been recently reported, in most of the processes the product suffers from inhomogeneity in size and shape limiting their impact. Here, we report the synthesis of undoped and nitrogen-doped luminescent carbon nanodots by rapid pyrolysis using ordered mesoporous silica nanorods as confining templates. A rapid thermal decomposition (pyrolysis) within the confined dimensions of their pores leads to a highly uniform size distribution of CNDs with average sizes below 4 nm. These CNDs are synthesized in an extremely short time period (5 min of reaction) by immersion in a fluidized-bed reactor that provides heating homogeneity and ensures fast heat transfer. In addition, a rapid release of the homogeneous CNDs can be easily achieved by a simple ultrasonication-filtration step that prevents further chemical action on the mesoporous templates. The emission of both undoped and N-doped CNDs in colloidal and solid state (with an efficiency of 1–5%) originates from a combination of quantum confinement effects and the presence of oxidized surface states; N-doping introduces resonant absorption states which participate in emission. Furthermore, we present a simple model to describe the excitation-dependent/-independent mechanism of carbon nanodots. info:eu-repo/grantAgreement/EC/FP7/294094/EU/Synthesis and characterization of NANOstructured materials with LumInescent properties for diaGnostic and tHerapeuTic applications/NANOLIGHT info:eu-repo/grantAgreement/EUR/ERC/HECTOR-267626 info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 7.082 2017 MATERIALS SCIENCE, MULTIDISCIPLINARY 32 / 285 = 0.112 2017 Q1 T1 CHEMISTRY, PHYSICAL 25 / 146 = 0.171 2017 Q1 T1 2.226 2017 Chemistry (miscellaneous) 2017 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Chung, N. X. Limpens, R. Gomez, L. (orcid)0000-0002-4546-4111 Hueso, J. L. (orcid)0000-0002-8701-9745 Santamaria, J. Universidad de Zaragoza Gregorkiewicz, T. 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 117 (2017), 437-446 Carbon Carbon 0008-6223 9196893 http://zaguan.unizar.es/record/70884/files/texto_completo.pdf Versión publicada 99738 http://zaguan.unizar.es/record/70884/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:70884 articulos driver 2019-07-09-12:01:28 ARTICLE