Tailoring Upconversion and Morphology of Yb/Eu Doped Y<sub>2</sub>O<sub>3</sub> Nanostructures by Acid Composition Mediation
The present study reports the production of upconverter nanostructures composed by a yttrium oxide host matrix co-doped with ytterbium and europium, i.e., Y<sub>2</sub>O<sub>3</sub>:Yb<sup>3+</sup>/Eu<sup>3+</sup>. These nanostructures were formed thro...
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MDPI AG
2019-02-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/9/2/234 |
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| author | Daniela Nunes Ana Pimentel Mariana Matias Tomás Freire A. Araújo Filipe Silva Patrícia Gaspar Silvia Garcia Patrícia A. Carvalho Elvira Fortunato Rodrigo Martins |
| author_facet | Daniela Nunes Ana Pimentel Mariana Matias Tomás Freire A. Araújo Filipe Silva Patrícia Gaspar Silvia Garcia Patrícia A. Carvalho Elvira Fortunato Rodrigo Martins |
| author_sort | Daniela Nunes |
| collection | DOAJ |
| description | The present study reports the production of upconverter nanostructures composed by a yttrium oxide host matrix co-doped with ytterbium and europium, i.e., Y<sub>2</sub>O<sub>3</sub>:Yb<sup>3+</sup>/Eu<sup>3+</sup>. These nanostructures were formed through the dissociation of yttrium, ytterbium and europium oxides using acetic, hydrochloric and nitric acids, followed by a fast hydrothermal method assisted by microwave irradiation and subsequent calcination process. Structural characterization has been carried out by X-ray diffraction (XRD), scanning transmission electron microscopy (STEM) and scanning electron microscopy (SEM) both coupled with energy dispersive X-ray spectroscopy (EDS). The acid used for dissociation of the primary oxides played a crucial role on the morphology of the nanostructures. The acetic-based nanostructures resulted in nanosheets in the micrometer range, with thickness of around 50 nm, while hydrochloric and nitric resulted in sphere-shaped nanostructures. The produced nanostructures revealed a homogeneous distribution of the doping elements. The thermal behaviour of the materials has been investigated with in situ X-Ray diffraction and differential scanning calorimetry (DSC) experiments. Moreover, the optical band gaps of all materials were determined from diffuse reflectance spectroscopy, and their photoluminescence behaviour has been accessed showing significant differences depending on the acid used, which can directly influence their upconversion performance. |
| first_indexed | 2024-12-22T15:36:47Z |
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| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-12-22T15:36:47Z |
| publishDate | 2019-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-8348c68436e5438c96f00040f5d9cfc12022-12-21T18:21:14ZengMDPI AGNanomaterials2079-49912019-02-019223410.3390/nano9020234nano9020234Tailoring Upconversion and Morphology of Yb/Eu Doped Y<sub>2</sub>O<sub>3</sub> Nanostructures by Acid Composition MediationDaniela Nunes0Ana Pimentel1Mariana Matias2Tomás Freire3A. Araújo4Filipe Silva5Patrícia Gaspar6Silvia Garcia7Patrícia A. Carvalho8Elvira Fortunato9Rodrigo Martins10i3N/CENIMAT, Department of Materials Science, Faculty of Sciences and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugali3N/CENIMAT, Department of Materials Science, Faculty of Sciences and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugali3N/CENIMAT, Department of Materials Science, Faculty of Sciences and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugali3N/CENIMAT, Department of Materials Science, Faculty of Sciences and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, 2829-516 Caparica, PortugalINCM, Imprensa Nacional-Casa da Moeda, Av. António José de Almeida, 1000-042 Lisboa, PortugalINCM, Imprensa Nacional-Casa da Moeda, Av. António José de Almeida, 1000-042 Lisboa, PortugalINCM, Imprensa Nacional-Casa da Moeda, Av. António José de Almeida, 1000-042 Lisboa, PortugalINCM, Imprensa Nacional-Casa da Moeda, Av. António José de Almeida, 1000-042 Lisboa, PortugalSINTEF Materials Physics, Forskningvein 1, 0373 Oslo, Norwayi3N/CENIMAT, Department of Materials Science, Faculty of Sciences and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugali3N/CENIMAT, Department of Materials Science, Faculty of Sciences and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, 2829-516 Caparica, PortugalThe present study reports the production of upconverter nanostructures composed by a yttrium oxide host matrix co-doped with ytterbium and europium, i.e., Y<sub>2</sub>O<sub>3</sub>:Yb<sup>3+</sup>/Eu<sup>3+</sup>. These nanostructures were formed through the dissociation of yttrium, ytterbium and europium oxides using acetic, hydrochloric and nitric acids, followed by a fast hydrothermal method assisted by microwave irradiation and subsequent calcination process. Structural characterization has been carried out by X-ray diffraction (XRD), scanning transmission electron microscopy (STEM) and scanning electron microscopy (SEM) both coupled with energy dispersive X-ray spectroscopy (EDS). The acid used for dissociation of the primary oxides played a crucial role on the morphology of the nanostructures. The acetic-based nanostructures resulted in nanosheets in the micrometer range, with thickness of around 50 nm, while hydrochloric and nitric resulted in sphere-shaped nanostructures. The produced nanostructures revealed a homogeneous distribution of the doping elements. The thermal behaviour of the materials has been investigated with in situ X-Ray diffraction and differential scanning calorimetry (DSC) experiments. Moreover, the optical band gaps of all materials were determined from diffuse reflectance spectroscopy, and their photoluminescence behaviour has been accessed showing significant differences depending on the acid used, which can directly influence their upconversion performance.https://www.mdpi.com/2079-4991/9/2/234microwave synthesisoxide dissociationdopingrare earth ionsupconversion |
| spellingShingle | Daniela Nunes Ana Pimentel Mariana Matias Tomás Freire A. Araújo Filipe Silva Patrícia Gaspar Silvia Garcia Patrícia A. Carvalho Elvira Fortunato Rodrigo Martins Tailoring Upconversion and Morphology of Yb/Eu Doped Y<sub>2</sub>O<sub>3</sub> Nanostructures by Acid Composition Mediation Nanomaterials microwave synthesis oxide dissociation doping rare earth ions upconversion |
| title | Tailoring Upconversion and Morphology of Yb/Eu Doped Y<sub>2</sub>O<sub>3</sub> Nanostructures by Acid Composition Mediation |
| title_full | Tailoring Upconversion and Morphology of Yb/Eu Doped Y<sub>2</sub>O<sub>3</sub> Nanostructures by Acid Composition Mediation |
| title_fullStr | Tailoring Upconversion and Morphology of Yb/Eu Doped Y<sub>2</sub>O<sub>3</sub> Nanostructures by Acid Composition Mediation |
| title_full_unstemmed | Tailoring Upconversion and Morphology of Yb/Eu Doped Y<sub>2</sub>O<sub>3</sub> Nanostructures by Acid Composition Mediation |
| title_short | Tailoring Upconversion and Morphology of Yb/Eu Doped Y<sub>2</sub>O<sub>3</sub> Nanostructures by Acid Composition Mediation |
| title_sort | tailoring upconversion and morphology of yb eu doped y sub 2 sub o sub 3 sub nanostructures by acid composition mediation |
| topic | microwave synthesis oxide dissociation doping rare earth ions upconversion |
| url | https://www.mdpi.com/2079-4991/9/2/234 |
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