Nanosized ZnGa2O4:Cr3+ Spinets as Highly Luminescent Materials for Bioimaging

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dc.contributor.authorSilva, Marlon Nunes da
dc.contributor.authorCarvalho, Jose Miranda de
dc.contributor.authorAbreu Fantini, Marcia Carvalho de
dc.contributor.authorChiavacci, Leila Aparecida [UNESP]
dc.contributor.authorBourgaux, Claudie
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniv Paris Sud
dc.date.accessioned2020-12-11T03:46:40Z
dc.date.available2020-12-11T03:46:40Z
dc.date.issued2019-11-01
dc.description.abstractIn the search for bright probes emitting in the red-to-near-IR region, in the biological transparency window where the absorption and diffusion of light by tissues and the autofluorescence are strongly reduced, Cr3+-doped zinc gallate (ZnGa2O4:Cr3+) spinels have recently attracted much interest because of their persistent luminescence. We present a novel aqueous route for the facile sol-gel synthesis of zinc gallate (ZnGa2O4) and Cr3+-doped zinc gallate nanospinels, with sizes smaller than 150 nm. The synthesis was performed at room temperature, and the obtained nanoparticles were then annealed at moderate temperatures (65, 350, and 700 degrees C). We have characterized the synthesized nanoparticles by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and proton-induced X-ray emission (PIXE). Their optical properties have been investigated. The luminescence of Cr3+ ions, centered at 700 nm, could be excited by wavelengths from UV to visible (250-580 nm). We have highlighted the crucial influence of the zinc gallate host structure on the excitation and emission spectra of Cr3+ ions. After annealing at 700 degrees C, these nanospinels also revealed a persistent luminescence, following an irradiation by UV (290 nm), blue (420 nm), or green-yellow (550 nm) light. UV irradiation was more effective for triggering persistent luminescence, characterized by fast and slow decay mechanisms. The depth of the traps responsible for this persistent luminescence was investigated by thermally stimulated luminescence.en
dc.description.affiliationUniv Sao Paulo, Dept Fis Aplicada, BR-05508090 Sao Paulo, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Fac Ciencias Farmaceut, BR-14801902 Araraquara, SP, Brazil
dc.description.affiliationUniv Paris Sud, Fac Pharm, Inst Galien Paris Sud, F-92290 Chatenay Malabry, France
dc.description.affiliationUnespUniv Estadual Paulista, Fac Ciencias Farmaceut, BR-14801902 Araraquara, SP, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdCAPES: 767-13
dc.description.sponsorshipIdFAPESP: 2017/05195-5
dc.format.extent6918-6927
dc.identifierhttp://dx.doi.org/10.1021/acsanm.9b01417
dc.identifier.citationAcs Applied Nano Materials. Washington: Amer Chemical Soc, v. 2, n. 11, p. 6918-6927, 2019.
dc.identifier.doi10.1021/acsanm.9b01417
dc.identifier.issn2574-0970
dc.identifier.urihttp://hdl.handle.net/11449/197563
dc.identifier.wosWOS:000499740800016
dc.language.isoeng
dc.publisherAmer Chemical Soc
dc.relation.ispartofAcs Applied Nano Materials
dc.sourceWeb of Science
dc.subjectZnGa2O4
dc.subjectZnGa2O4:Cr-3
dc.subjectnew sol-gel synthesis
dc.subjectred-to-near-IR emitting probes
dc.subjectpersistent luminescence properties
dc.subjectthermally stimulated luminescence
dc.subjectstructure/properties relationship
dc.titleNanosized ZnGa2O4:Cr3+ Spinets as Highly Luminescent Materials for Bioimagingen
dc.typeArtigo
dcterms.rightsHolderAmer Chemical Soc
unesp.author.orcid0000-0002-0121-1016[1]
unesp.author.orcid0000-0002-5828-0848[2]
unesp.author.orcid0000-0003-3128-3739[4]

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