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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
21/06/2021 |
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Data da última atualização: |
10/06/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
DIAS, J. A.; FREIRE, A. L. F.; GIROTTO, I.; DEL ROVERI, C.; MASTELARO, V. R.; PARIS, E. C.; GIRALDI, T. R. |
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Afiliação: |
ELAINE CRISTINA PARIS, CNPDIA. |
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Título: |
Phase evolution and optical properties of nanometric Mn-doped TiO2 pigments. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Materials Today Communications, v. 27, e102295, 2021. |
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Páginas: |
1-12 |
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ISSN: |
2352-4928 |
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DOI: |
https://doi.org/10.1016/j.mtcomm.2021.102295 |
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Idioma: |
Inglês |
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Conteúdo: |
This paper aims to evaluate the effects of calcination temperature and manganese doping on optical properties and phase evolution of Mn-doped TiO2 pigments. The powders were prepared by the polymeric precursor method at Mn contents of 0, 1, 2 and 3 % and calcined at 600, 700 and 800 ◦C. The results demonstrated that crystalline powders were produced in all conditions evaluated. It was further noted that the samples calcined at 600 ◦C were composed of rutile and anatase TiO2 polymorphs. However, the anatase phase was completely converted into rutile at temperatures above 700 ◦C. The particle size increased with increasing temperature. The same behavior was observed for the measured crystallite sizes. The Mn3+ ion charge was determined as the main valence for manganese ions in the TiO2 host. Oxygen vacancies are the probable crystal defects formed for charge balancing in the Mn-doped rutile structure. The results obtained for the powder with 3 % Mn and calcined at 800 ◦C demonstrated dopant cation segregation to form Mn2O3. It is important to emphasize that the absorbance values of the powders increase in the visible range when adding manganese compared to the absorbance values of pure TiO2. The band gap of the powders was reduced in accordance with the content of doping: from 3.04 eV (0 % Mn) to 2.05–2.20 eV (3 % Mn), with small differences depending on the calcination temperature. The increase in visible light absorbance led to a brown color in Mn-doped materials. Thus, the color intensity varied with the Mn content, ranging from light brown to dark brown powders. In conclusion, the temperature of 700 ◦C was established in this paper as the best condition to produce Mn-doped TiO2 pigments, based on the absence of anatase polymorph, small contents of residual carbon, and undetectable amounts of Mn2O3 due to segregation MenosThis paper aims to evaluate the effects of calcination temperature and manganese doping on optical properties and phase evolution of Mn-doped TiO2 pigments. The powders were prepared by the polymeric precursor method at Mn contents of 0, 1, 2 and 3 % and calcined at 600, 700 and 800 ◦C. The results demonstrated that crystalline powders were produced in all conditions evaluated. It was further noted that the samples calcined at 600 ◦C were composed of rutile and anatase TiO2 polymorphs. However, the anatase phase was completely converted into rutile at temperatures above 700 ◦C. The particle size increased with increasing temperature. The same behavior was observed for the measured crystallite sizes. The Mn3+ ion charge was determined as the main valence for manganese ions in the TiO2 host. Oxygen vacancies are the probable crystal defects formed for charge balancing in the Mn-doped rutile structure. The results obtained for the powder with 3 % Mn and calcined at 800 ◦C demonstrated dopant cation segregation to form Mn2O3. It is important to emphasize that the absorbance values of the powders increase in the visible range when adding manganese compared to the absorbance values of pure TiO2. The band gap of the powders was reduced in accordance with the content of doping: from 3.04 eV (0 % Mn) to 2.05–2.20 eV (3 % Mn), with small differences depending on the calcination temperature. The increase in visible light absorbance led to a brown color in Mn-doped materials. Thus, the ... Mostrar Tudo |
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Palavras-Chave: |
Crystallinity; Doping; Rutile; Structure. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02635naa a2200277 a 4500
001 2132451
005 2022-06-10
008 2021 bl uuuu u00u1 u #d
022 $a2352-4928
024 7 $ahttps://doi.org/10.1016/j.mtcomm.2021.102295$2DOI
100 1 $aDIAS, J. A.
245 $aPhase evolution and optical properties of nanometric Mn-doped TiO2 pigments.$h[electronic resource]
260 $c2021
300 $a1-12
520 $aThis paper aims to evaluate the effects of calcination temperature and manganese doping on optical properties and phase evolution of Mn-doped TiO2 pigments. The powders were prepared by the polymeric precursor method at Mn contents of 0, 1, 2 and 3 % and calcined at 600, 700 and 800 ◦C. The results demonstrated that crystalline powders were produced in all conditions evaluated. It was further noted that the samples calcined at 600 ◦C were composed of rutile and anatase TiO2 polymorphs. However, the anatase phase was completely converted into rutile at temperatures above 700 ◦C. The particle size increased with increasing temperature. The same behavior was observed for the measured crystallite sizes. The Mn3+ ion charge was determined as the main valence for manganese ions in the TiO2 host. Oxygen vacancies are the probable crystal defects formed for charge balancing in the Mn-doped rutile structure. The results obtained for the powder with 3 % Mn and calcined at 800 ◦C demonstrated dopant cation segregation to form Mn2O3. It is important to emphasize that the absorbance values of the powders increase in the visible range when adding manganese compared to the absorbance values of pure TiO2. The band gap of the powders was reduced in accordance with the content of doping: from 3.04 eV (0 % Mn) to 2.05–2.20 eV (3 % Mn), with small differences depending on the calcination temperature. The increase in visible light absorbance led to a brown color in Mn-doped materials. Thus, the color intensity varied with the Mn content, ranging from light brown to dark brown powders. In conclusion, the temperature of 700 ◦C was established in this paper as the best condition to produce Mn-doped TiO2 pigments, based on the absence of anatase polymorph, small contents of residual carbon, and undetectable amounts of Mn2O3 due to segregation
653 $aCrystallinity
653 $aDoping
653 $aRutile
653 $aStructure
700 1 $aFREIRE, A. L. F.
700 1 $aGIROTTO, I.
700 1 $aDEL ROVERI, C.
700 1 $aMASTELARO, V. R.
700 1 $aPARIS, E. C.
700 1 $aGIRALDI, T. R.
773 $tMaterials Today Communications$gv. 27, e102295, 2021.
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Embrapa Instrumentação (CNPDIA) |
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| Registros recuperados : 26 | |
| 1. |  | AVANSI, W.; RIBEIRO, C.; LEITE, E. R.; MASTELARO, V. R. Controllable synthesis characterizations of crystalline Na2V6O153.0H2O nanowires In: INTERNATIONAL CONFERENCE ON FOOD AND AGRICULTURE APPLICATIONS OF NANOTECHNOLOGIES - NanoAgri, 2010, São Pedro, SP. [Anais…] São Pedro: Aptor Software, 2010. Editors: Caue Ribeiro, Odílio Benedito Garrido de Assis, Luiz Henrique Capparelli Mattoso, Sérgio Mascarenhas.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Instrumentação. |
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| 2. | | AVANSI, W.; RIBEIRO, C.; LEITE, E. R.; MASTELARO, V. R. Synthesis and characterization of nanostrctured V2O5nH2O prepared throughout the hydrothermal method. In: ENCONTRO DA SOCIEDADE BRASILEIRA DE PESQUISA EM MATERIAIS - SBPMat, 7., 2008, Guarujá; BRAZILIAN MRS MEETING, 7., 2008, Guarujá. Abstracts... Rio de Janeiro: SBPMat, 2008. não paginado. 1CD-ROM.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Instrumentação. |
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| 3. | | ASSIS, O. B. G.; FLORES, A. M.; BERNARDES-FILHO, R.; MASTELARO, V. R. AFM surface characterization of Ce-oxide based porus glass for sensor applications. Acta Microscopica, Maracaibo, v. 10, p. 87-90. abr 2001. Supplement 1. Proceedings of The First Latin American Symposium on Scanning Microscopy, São Pedro, SP, april, 2001.| Biblioteca(s): Embrapa Instrumentação. |
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| 11. | | RIBEIRO, C.; VILA, C.; STROPPA, D. B.; MASTELARO, V. R.; BETTINI, J.; LONGO, E.; LEITE, E. R. Anisotropic growth of oxide nanocrystals: Insight sinto the Rutile TiO2 phase. Journal of Physical Chemistry C, Nanomaterials and Interface, Washington, DC, v. 111, n. 16, p. 5871-5875, 2007.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - B |
| Biblioteca(s): Embrapa Instrumentação. |
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| 12. | | OLIVEIRA, L. H.; PARIS, E. C.; AVANSI, W.; RAMIREZ, M. A.; MASTELARO, V. R.; LONGO, E.; VARELA, J. A. Correlation between photoluminescence and structural defects in Ca1+xCu3-xTi4O12 systems. Journal of the American Ceramic Society, Westerville, v. 96, n. 1, p. 209-217, 2013.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Instrumentação. |
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| 13. | | CATTO, A. C.; SILVA, L. F. da; RIBEIRO, C.; BERNARDINI, S.; AGUIR, K.; LONGO, E.; MASTELARO, V. R. An easy method of preparing ozone gas sensors based on ZnO nanorods. RSC Advances, [S. l.], v. 5, p. 19528-19533, 2015.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Instrumentação. |
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| 15. | | SILVA, L. F. da; AVANSI JR, W.; ANDRÉS, J.; RIBEIRO, C.; MOREIRA, M. L.; LONGO, E.; MASTELARO, V. R. Long-range and short-range structures of cube-like shape SrTiO3 powders: microwave-assisted hydrothermal synthesis and photocatalytic activity. Physical Chemistry Chemical Physics, Cambridge, v. 15, n. 29, p. 12386-12393, 2013.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Instrumentação. |
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| 16. | | SILVA, L. F.; M'PEKO, J.-C.; CATTO, A. C.; BERNARDINI, S.; MASTELARO, V. R.; OLIVEIRA, C. R. de; LONGO, E. UV-enhanced ozone sensing response of ZnO-SnO2[subscrito] heterojunctions at room temperature. In: Sensor and Actuators. B, Chemical, n. 240, p. 573-579, 2017.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Instrumentação. |
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| 17. | | AVANSI, W.; MENDONÇA, V. R. de; MAIA, L. J. Q.; OLIVEIRA, C. R. de; LONGO, E.; MASTELARO, V. R. Vanadium pentoxide nanostrucutres: optical properties and visible-light photocatalytic performance. In: ENCONTRO DA SBPMAT, 10.; BRAZILIAN MRS MEETING, 10., 2011, Gramado. Resumos... Rio de Janeiro: SBPMat, 2011. não paginado.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Instrumentação. |
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| 18. | | FIGUEIREDO, A.; VIEIRA, N. C. S; AVANSI, W.; OLIVEIRA, C. R. de; MASTELARO, V. R.; ZUCOLOTTO, V.; GUIMARÃES, F. E. G. Multicomposites of Dendrimers and vanadium pentoxide nanostructures: application as pH sensors. In: ENCONTRO DA SBPMAT, 10.; BRAZILIAN MRS MEETING, 10., 2011, Gramado. Resumos... Rio de Janeiro: SBPMat, 2011. não paginado.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Instrumentação. |
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| 19. | | DIAS, J. A.; FREIRE, A. L. F.; GIROTTO, I.; DEL ROVERI, C.; MASTELARO, V. R.; PARIS, E. C.; GIRALDI, T. R. Phase evolution and optical properties of nanometric Mn-doped TiO2 pigments. Materials Today Communications, v. 27, e102295, 2021. 1-12| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Instrumentação. |
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| 20. | | MOREIRA, A. J.; MALAFATTI, J. O. D.; GIRALDI, T. R.; PARIS, E. C.; PEREIRA, E. C.; MENDONÇA, V. R.; MASTELARO, V. R.; FRESCHI, G. P. G. Prozac® photodegradation mediated by Mn-doped TiO2 nanoparticles: Evaluation of by-products and mechanisms proposal. Journal of Environmental Chemical Engineering, v. 8, 104543, 2020. 1 - 13| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
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| Registros recuperados : 26 | |
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