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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
29/03/2022 |
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Data da última atualização: |
24/11/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
FACURE, M. H. M.; SCHNEIDER, R.; MERCANTE, L. A.; CORREA, D. S. |
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Afiliação: |
DANIEL SOUZA CORREA, CNPDIA. |
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Título: |
Rational hydrothermal synthesis of graphene quantum dots with optimized luminescent properties for sensing applications. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Materials Today Chemistry, v. 23, 100, 2022. |
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Páginas: |
1 - 12 |
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ISSN: |
2468-5194 |
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DOI: |
https://doi.org/10.1016/j.mtchem.2021.100755 |
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Idioma: |
Inglês |
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Conteúdo: |
Hydrothermal synthesis using graphene oxide (GO) as a precursor has been used to produce luminescent graphene quantum dots (GQDs). However, such a method usually requires many reagents and multistep pretreatments, while can give rise to GQDs with low quantum yield (QY). Here, we investigated the concentration, the temperature of synthesis, and the pH of the GO solution used in the hydrothermal method through factorial design experiments aiming to optimize the QY of GQDs to reach a better control of their luminescent properties. The best synthesis condition (2 mg/mL, 175 C, and pH ¼ 8.0) yielded GQDs with a relatively high QY (8.9%) without the need of using laborious steps or dopants. GQDs synthesized under different conditions were characterized to understand the role of each synthesis parameter in the materials' structure and luminescence properties. It was found that the control of the synthesis parameters enables the tailoring of the amount of specific oxygen functionalities onto the surface of the GQDs. By changing the synthesis' conditions, it was possible to prioritize the production of GQDs with more hydroxyl or carboxyl groups, which influence their luminescent properties. The asdeveloped GQDs with tailored composition were used as luminescent probes to detect Fe3þ. The lowest limit of detection (0.136 mM) was achieved using GQDs with higher amounts of carboxylic groups, while wider linear range was obtained by GQDs with superior QY. Thus, our findings contribute to rationally produce GQDs with tailored properties for varied applications by simply adjusting the synthesis conditions and suggest a pathway to understand the mechanism of detection of GQDs-based optical sensors. MenosHydrothermal synthesis using graphene oxide (GO) as a precursor has been used to produce luminescent graphene quantum dots (GQDs). However, such a method usually requires many reagents and multistep pretreatments, while can give rise to GQDs with low quantum yield (QY). Here, we investigated the concentration, the temperature of synthesis, and the pH of the GO solution used in the hydrothermal method through factorial design experiments aiming to optimize the QY of GQDs to reach a better control of their luminescent properties. The best synthesis condition (2 mg/mL, 175 C, and pH ¼ 8.0) yielded GQDs with a relatively high QY (8.9%) without the need of using laborious steps or dopants. GQDs synthesized under different conditions were characterized to understand the role of each synthesis parameter in the materials' structure and luminescence properties. It was found that the control of the synthesis parameters enables the tailoring of the amount of specific oxygen functionalities onto the surface of the GQDs. By changing the synthesis' conditions, it was possible to prioritize the production of GQDs with more hydroxyl or carboxyl groups, which influence their luminescent properties. The asdeveloped GQDs with tailored composition were used as luminescent probes to detect Fe3þ. The lowest limit of detection (0.136 mM) was achieved using GQDs with higher amounts of carboxylic groups, while wider linear range was obtained by GQDs with superior QY. Thus, our findings contribute to... Mostrar Tudo |
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Palavras-Chave: |
Factorial design; Fe3þ detection; GQDs; Hydrothermal method; Quantum yield. |
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Categoria do assunto: |
-- |
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Marc: |
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022 $a2468-5194
024 7 $ahttps://doi.org/10.1016/j.mtchem.2021.100755$2DOI
100 1 $aFACURE, M. H. M.
245 $aRational hydrothermal synthesis of graphene quantum dots with optimized luminescent properties for sensing applications.$h[electronic resource]
260 $c2022
300 $a1 - 12
520 $aHydrothermal synthesis using graphene oxide (GO) as a precursor has been used to produce luminescent graphene quantum dots (GQDs). However, such a method usually requires many reagents and multistep pretreatments, while can give rise to GQDs with low quantum yield (QY). Here, we investigated the concentration, the temperature of synthesis, and the pH of the GO solution used in the hydrothermal method through factorial design experiments aiming to optimize the QY of GQDs to reach a better control of their luminescent properties. The best synthesis condition (2 mg/mL, 175 C, and pH ¼ 8.0) yielded GQDs with a relatively high QY (8.9%) without the need of using laborious steps or dopants. GQDs synthesized under different conditions were characterized to understand the role of each synthesis parameter in the materials' structure and luminescence properties. It was found that the control of the synthesis parameters enables the tailoring of the amount of specific oxygen functionalities onto the surface of the GQDs. By changing the synthesis' conditions, it was possible to prioritize the production of GQDs with more hydroxyl or carboxyl groups, which influence their luminescent properties. The asdeveloped GQDs with tailored composition were used as luminescent probes to detect Fe3þ. The lowest limit of detection (0.136 mM) was achieved using GQDs with higher amounts of carboxylic groups, while wider linear range was obtained by GQDs with superior QY. Thus, our findings contribute to rationally produce GQDs with tailored properties for varied applications by simply adjusting the synthesis conditions and suggest a pathway to understand the mechanism of detection of GQDs-based optical sensors.
653 $aFactorial design
653 $aFe3þ detection
653 $aGQDs
653 $aHydrothermal method
653 $aQuantum yield
700 1 $aSCHNEIDER, R.
700 1 $aMERCANTE, L. A.
700 1 $aCORREA, D. S.
773 $tMaterials Today Chemistry$gv. 23, 100, 2022.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
13/09/2018 |
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Data da última atualização: |
13/09/2018 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
LEITE, J. T.; KAMPHORST, S. H.; LIMA, V. J. de; AZEVEDO, V. C.; SILVA, R. M. da R.; CAMPOSTRINI, E.; GUIMARAES, L. J. M.; AMARAL JÚNIOR, A. T. do. |
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Afiliação: |
Jhean Torres Leite, Universidade Estadual do Norte Fluminense Darcry Ribeiro; Samuel Henrique Kamphorst; Valter Jário de Lima; Valdinei Cruz Azeredo; Rachel Martins da Rocha Silva; Eliemar Campostrini; LAURO JOSE MOREIRA GUIMARAES, CNPMS; Antônio Teixeira do Amaral Júnior. |
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Título: |
O aprofundamento radicular como resposta de tolerância ao estresse hídrico em linhagens de milho-pipoca. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
In: CONGRESSO NACIONAL DE MILHO E SORGO, 32., 2018, Lavras. Soluções integradas para os sistemas de produção de milho e sorgo no Brasil: resumos. Sete Lagoas: Associação Brasileira de Milho e Sorgo, 2018. |
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Páginas: |
p. 284. |
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Idioma: |
Português |
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Thesagro: |
Fotossíntese; Raiz; Seca. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/182877/1/Aprofundamento-radicular.pdf
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Marc: |
LEADER 00858nam a2200229 a 4500
001 2095636
005 2018-09-13
008 2018 bl uuuu u00u1 u #d
100 1 $aLEITE, J. T.
245 $aO aprofundamento radicular como resposta de tolerância ao estresse hídrico em linhagens de milho-pipoca.$h[electronic resource]
260 $aIn: CONGRESSO NACIONAL DE MILHO E SORGO, 32., 2018, Lavras. Soluções integradas para os sistemas de produção de milho e sorgo no Brasil: resumos. Sete Lagoas: Associação Brasileira de Milho e Sorgo$c2018
300 $ap. 284.
650 $aFotossíntese
650 $aRaiz
650 $aSeca
700 1 $aKAMPHORST, S. H.
700 1 $aLIMA, V. J. de
700 1 $aAZEVEDO, V. C.
700 1 $aSILVA, R. M. da R.
700 1 $aCAMPOSTRINI, E.
700 1 $aGUIMARAES, L. J. M.
700 1 $aAMARAL JÚNIOR, A. T. do
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