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Highly fluorescent C-dots obtained by pyrolysis of quaternary ammonium ions trapped in all-silica ITQ-29 zeolite

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Highly fluorescent C-dots obtained by pyrolysis of quaternary ammonium ions trapped in all-silica ITQ-29 zeolite

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dc.contributor.author García Baldoví, Hermenegildo es_ES
dc.contributor.author Valencia Valencia, Susana es_ES
dc.contributor.author Alvaro Rodríguez, Maria Mercedes es_ES
dc.contributor.author Abdullah, Asiri M. es_ES
dc.contributor.author García Gómez, Hermenegildo es_ES
dc.date.accessioned 2016-06-09T07:27:24Z
dc.date.available 2016-06-09T07:27:24Z
dc.date.issued 2015
dc.identifier.issn 2040-3364
dc.identifier.uri http://hdl.handle.net/10251/65558
dc.description.abstract [EN] C-dots obtained in the homogeneous phase may exhibit a broad particle size distribution. The formation of C-dots within nanometric reaction cavities could be a methodology to gain control on their size distribution. Among the various possibilities, in the present work, the cavities of small pore size zeolites have been used to confine C-dots generated by the pyrolysis of the organic structure directing agent present in the synthesis of these crystalline aluminosilicates. To explore this methodology, ITQ-29 zeolite having a Linde type A (LTA) structure was prepared as pure silica with 4-methyl-2,3,6,7-tetrahydro-1H, 5H-pyrido[3.2.1-ij] quinolinium as the organic structure directing agent. Pyrolysis under an inert atmosphere at 550 degrees C of a pure-silica ITQ-29 sample (cubic particles of 4 mu m edge) renders a highly fluorescent zeolite containing about 15 wt% of the carbonised residue. While another small pore zeolite, ITQ-12 (ITW), also renders photoluminescent C-dots under similar conditions, medium or large pore zeolites, such as silicalite (MFI) or pure silica Beta (BEA), failed to produce fluorescent powders under analogous thermal treatment and only decomposition and complete removal of the corresponding quaternary ammonium ion templates was observed for these zeolites. The dissolution of the pyrolysed ITQ-29 zeolite framework and the extraction of the carbon residue with ethyl acetate have allowed the characterisation of C-dots with particle sizes between 5 and 12 nm and a photoluminescence quantum yield of 0.4 upon excitation at 350 nm that is among the highest reported for non-surface functionalized C-dots. Photoluminescence varies with the excitation wavelength and is quenched by oxygen. Pyrolysed ITQ-29 powders can act as fluorescent oxygen sensors. es_ES
dc.description.sponsorship Financial support by the Spanish Ministry of Economy and Competitiveness (Severo Ochoa and CTQ2012-32315) and Generalidad Valenciana (Prometeo 2012-014) is gratefully acknowledged.
dc.language Inglés es_ES
dc.publisher Royal Society of Chemistry es_ES
dc.relation MINECO/CTQ2012-32315 es_ES
dc.relation GV/PROMETEO/2012-014 es_ES
dc.relation.ispartof Nanoscale es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Carbon dot quaternary ammonium ion silica zeolite es_ES
dc.subject Pyrolysis es_ES
dc.subject Fluorescent es_ES
dc.subject Graphene quantum dots es_ES
dc.subject Photoluminescent carbon dots es_ES
dc.subject Aluminophosphate zeolite es_ES
dc.subject Hidrothermal synthesis es_ES
dc.subject Molecular-sieves es_ES
dc.subject Nanoparticles es_ES
dc.subject Nanotubes es_ES
dc.subject Emission es_ES
dc.subject Carbonization es_ES
dc.subject Nanocrystals es_ES
dc.subject.classification QUIMICA ORGANICA es_ES
dc.title Highly fluorescent C-dots obtained by pyrolysis of quaternary ammonium ions trapped in all-silica ITQ-29 zeolite es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1039/C4NR05295A
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Instituto Universitario Mixto de Tecnología Química - Institut Universitari Mixt de Tecnologia Química es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Química - Departament de Química es_ES
dc.description.bibliographicCitation García Baldoví, H.; Valencia Valencia, S.; Alvaro Rodríguez, MM.; Abdullah, AM.; García Gómez, H. (2015). Highly fluorescent C-dots obtained by pyrolysis of quaternary ammonium ions trapped in all-silica ITQ-29 zeolite. Nanoscale. 7(5):1744-1752. doi:10.1039/C4NR05295A es_ES
dc.description.accrualMethod Senia es_ES
dc.relation.publisherversion http://dx.doi.org/10.1039/c4nr05295a es_ES
dc.description.upvformatpinicio 1744 es_ES
dc.description.upvformatpfin 1752 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 7 es_ES
dc.description.issue 5 es_ES
dc.relation.senia 298328 es_ES
dc.identifier.eissn 2040-3372
dc.identifier.pmid 25516465
dc.contributor.funder Ministerio de Economía y Competitividad
dc.contributor.funder Generalitat Valenciana


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