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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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| 1. |  | CRUSIOL, L. G. T.; SIBALDELLI, R. N. R.; FARIAS, J. R. B.; NANNI, M. R.; FURLANETTO, R. H.; OLIVEIRA JUNIOR, A. de; NEPOMUCENO, A. L.; FLAUSINO, A. M.; REIS, A. S.; SILVA, B. M. da; CASTRO, C. de; GODOY, C. V.; MINATO, E. A.; CEZAR, E.; OLIVEIRA, F. A. de; SANTOS, G. L. A. A. dos; GONÇALVES, J. V. F.; FOLONI, J. S. S.; FAZAM, J. C.; FRANCHINI, J. C.; OLIVEIRA, K. M. de; MORAES, L. A. C.; MERTZ-HENNING, L. M.; BATISTA, M. A.; NEUMAIER, N.; FALCIONI, R.; ROGGIA, S.; GONCALVES, S. L. 50 anos do NDVI: desmistificando o índice e ponderando sua utilização para o monitoramento da soja na era digital. Londrina: Embrapa Soja, 2024. 83 p. (Embrapa Soja. Documentos, 463).| Biblioteca(s): Embrapa Soja. |
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| 2. | | FERNANDES, J. B.; NOMURA, R. B. G.; FAZAM, J. C.; PASINI, A.; ROGGIA, S.; MARCELINO-GUIMARÃES, F. C. lngestão de dsRNA para s¡lenciamento gênico em Euschistus heros (Hemiptera: Pentatomidae). In: CONGRESSO BRASILEIRO DE ENTOMOLOGIA, 27.; CONGRESSO LATINO-AMERICANO DE ENTOMOLOGIA, 10., 2018, Gramado, RS. Saúde, ambiente e agricultura: anais. Santo Antonio de Goiás: SEB: UFSM, 2018. v. 2. resumo. p. 928.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| 4. | | FERNANDES, J. B.; FAZAM, J. C.; GAZZONI, D. L. Polinizadores da soja sobre influência de cultivares Bt e não Bt no cerrado brasileiro. In: CONGRESSO BRASILEIRO DE ENTOMOLOGIA, 27.; CONGRESSO LATINO-AMERICANO DE ENTOMOLOGIA, 10., 2018, Gramado, RS. Saúde, ambiente e agricultura: anais. Santo Antonio de Goiás: SEB: UFSM, 2018. v. 2. resumo. p. 1304.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| 5. | | FAZAM, J. C.; PASINI, A.; FERNANDES, J. B.; LOBAK, T.; MATSUMOTO, J. F.; HOSHINO, A. T.; ROGGIA, S. Seletividade de benzoato de emamectina a coleópteros predadores em soja. In: CONGRESSO BRASILEIRO DE ENTOMOLOGIA, 27.; CONGRESSO LATINO-AMERICANO DE ENTOMOLOGIA, 10., 2018, Gramado, RS. Saúde, ambiente e agricultura: anais. Santo Antonio de Goiás: SEB: UFSM, 2018. v. 2. resumo. p. 1774.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| 7. | | LOBAK, T.; SISMEIRO, M. N. S.; VIEIRA, A. C.; FAZAM, J. C.; GONÇALVES, L. S. A.; PASINI, A.; ROGGIA, S. Densidade populacional de lagartas e predadores em soja Bt. In: CONGRESSO BRASILEIRO DE ENTOMOLOGIA, 25., 2014, Goiânia. Entomologia integrada à sociedade para o desenvolvimento sustentável: anais. [Londrina]: SEB, 2014.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| 8. | | VIEIRA, A. C.; SISMEIRO, M. N. S.; VISENTINI, A.; TURA, G. M.; FAZAM, J. C.; SILVA, J. E. P. da; PASINI, A.; ROGGIA, S. Densidade de pragas e inimigos naturais em resposta ao tratamento de sementes de soja com inseticidas. In: JORNADA ACADÊMICA DA EMBRAPA SOJA, 8., 2013, Londrina. Resumos expandidos... Londrina: Embrapa Soja, 2013. p. 32-36. (Embrapa Soja. Documentos, 339).| Tipo: Artigo em Anais de Congresso |
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| 9. | | SISMEIRO, M. N. S.; FAZAM, J. C.; VIEIRA, A. C.; LOBAK, T.; PASINI, A.; ROGGIA, S.; GONÇALVES, L. S. A. Espécies de Carabidae ocorrentes em soja Bt. In: SIMPÓSIO DE CONTROLE BIOLÓGICO, 13., 2013, Bonito, MS. Anais... Brasília, DF: Embrapa, 2013. 1 CD-ROM. SICONBIOL.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| 10. | | FAZAM, J. C.; SISMEIRO, M. N. S.; ROGGIA, S.; PASINI, A.; TURA, G. M.; VISENTINI, A.; VIEIRA, A. C.; SILVA, J. E. P. da; LOPES, G. H. Efeito da soja Bt sobre a frequência e densidade populacional de pragas e predadores. In: JORNADA ACADÊMICA DA EMBRAPA SOJA, 8., 2013, Londrina. Resumos expandidos... Londrina: Embrapa Soja, 2013. p. 115-118. (Embrapa Soja. Documentos, 339).| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| 11. | | SISMEIRO, M. N. S.; FAZAM, J. C.; VIEIRA, A. C.; LOBAK, T.; POLONI, J. E. S.; PASINI, A.; ROGGIA, S. Predadores em soja transgênica tolerante a lagartas (Bt) e a herbicida (RR). In: SIMPÓSIO DE CONTROLE BIOLÓGICO, 13., 2013, Bonito, MS. Anais... Brasília, DF: Embrapa, 2013. 1 CD-ROM. SICONBIOL.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| Registros recuperados : 11 | |
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