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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 : 11 | |
| 2. |  | MELO, T. S.; ALVES, J. da S. R.; SILVA, M. S. da; ALVES, M. E. dos S.; NEVES, R. P.; MARQUES, R. F.; LIMA FILHO, O. F. de. Diagnose visual de macronutrientes primários em sorgo sacarino. In: JORNADA DE INICIAÇÃO À PESQUISA DA EMBRAPA, 2014, Dourados. Resumos... Brasília, DF: Embrapa, 2014. 1 CD-ROM; JIPE 2014.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Agropecuária Oeste. |
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| 3. | | MELO, T. S.; ALVES, J. da S. R.; SILVA, M. dos S.; SILVA, M. S. da; ALVES, M. E. dos; NEVES, R. P.; MARQUES, R. F.; CECCON, G. Diagnose visual de macronutrientes primários em sorgo sacarino. In: JORNADA DE INICIAÇÃO À PESQUISA DA EMBRAPA, 2014, Dourados. Resumos... Brasília, DF: Embrapa, 2014. 1 CD-ROM; JIPE 2014.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Agropecuária Oeste. |
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| 4. | | NEVES, R. P.; MELO, T. S.; ALVES, J. da S. R.; SILVA, M. S. da; CONCENCO, G.; LIMA FILHO, O. F. de. Diagnose visual de macronutrientes secundários em sorgo sacarino. In: JORNADA DE INICIAÇÃO À PESQUISA DA EMBRAPA, 2014, Dourados. Resumos... Brasília, DF: Embrapa, 2014. 1 CD-ROM; JIPE 2014.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Agropecuária Oeste. |
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| 5. | | ALVES, J. da S. R. A.; SILVA, M. S. da; NEVES, R. P.; MELO, T. S.; LORENCETTI, F.; LIMA FILHO, O. F. de. O uso de sistema hidropônico em estudos nutricionais de plantas. In: JORNADA DE INICIAÇÃO À PESQUISA DA EMBRAPA, 2014, Dourados. Resumos... Brasília, DF: Embrapa, 2014. 1 CD-ROM; JIPE 2014.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Agropecuária Oeste. |
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| 6. | | SILVA, M. S. da; ALVES, J. da S. R.; SANTOS, M. E. dos; NEVES, R. P.; SANTOS, S. A. dos; MELO, T. S.; PALHARINI, W. G.; LIMA FILHO, O. F. de. Análise de crescimento de quatro variedades de sorgo sacarino nas safras de verão e segunda safra. In: JORNADA DE INICIAÇÃO À PESQUISA DA EMBRAPA, 2014, Dourados. Resumos... Brasília, DF: Embrapa, 2014. 1 CD-ROM; JIPE 2014.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Agropecuária Oeste. |
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| 7. | | MELO, T. S.; ALVES, M. E. dos S.; PALHARINI, W. G.; ALVES, J. da S. R.; SILVA, M. S. da; NEVES, R. P.; CONCENCO, G.; LIMA FILHO, O. F. de. Comportamento fisiológico de plantas adultas de sorgo sacarino sob deficiências nutricionais. In: JORNADA DE INICIAÇÃO À PESQUISA DA EMBRAPA, 2014, Dourados. Resumos... Brasília, DF: Embrapa, 2014. 1 CD-ROM; JIPE 2014.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Agropecuária Oeste. |
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| 8. | | NEVES, R. P.; SANTOS, S. A. dos; MARQUES, R. F.; MELO, T. S.; ALVES, J. da S. R.; SILVA, M. S. da; CONCENCO, G.; LIMA FILHO, O. F. de. Deficiências nutricionais reduzem o desempenho fisiológico inicial do pinhão-manso. In: JORNADA DE INICIAÇÃO À PESQUISA DA EMBRAPA, 2014, Dourados. Resumos... Brasília, DF: Embrapa, 2014. 1 CD-ROM; JIPE 2014.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Agropecuária Oeste. |
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| 9. | | SILVA, M. S. da; SANTOS, S. A. dos; MARQUES, R. F.; MELO, T. S.; ALVES1, J. da S. R.; NEVES, R. P.; CONCENCO, G.; LIMA FILHO, O. F. de. Deficiências nutricionais reduzem o desempenho fisiológico inicial do sorgo sacarino. In: JORNADA DE INICIAÇÃO À PESQUISA DA EMBRAPA, 2014, Dourados. Resumos... Brasília, DF: Embrapa, 2014. 1 CD-ROM; JIPE 2014.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Agropecuária Oeste. |
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| 10. | | LIMA, L. F. DE; ANDRADE-PINHEIRO, J. C.; FREITAS, M. A.; SILVA, A. I. DA; FONSECA, V. J. A.; SILVA, T. G. DA; SILVA, J. C. P. DA; LIMA, R. H. DE; SALES, D. L.; NEVES, R. P.; BRITO, E. S. de; RIBEIRO, P. R. V.; CANUTO, K. M.; COUTINHO, H. D. M.; SIYADATPANAH, A.; KIM, B.; MORAIS-BRAGA, M. F. B. Anti-Candida properties of Gossypium hirsutum L.: enhancement of fungal growth, biofilm production and antifungal resistance. Pharmaceutics, v. 14, n. 698, 2022. 18 p.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 1 |
| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Alimentos e Territórios. |
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| 11. | | FREITAS, M. A. de; ANDRADE, J. C.; ALVES, A. I. S.; SANTOS, F. de A. G. dos; LEITE-ANDRADE, M. C.; SALES, D. L.; NUNES, M.; RIBEIRO, P. R. V.; COUTINHO, H. D. M.; MORAIS-BRAGA, M. F. B.; NEVES. R. P. Use of the natural products from the leaves of the fruitfull tree Persea americana against Candida sp. biofilms using acrylic resin discs. Science of the Total Environment, 703, art. no. 134779, 2020.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| Registros recuperados : 11 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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