Preparation of Carbon Dots and Their Optical Characterization: An Experiment of Nanoscience for Undergraduate Course

Vaz, Roberto; Vieira, Kayo O.; Machado, Cláudia Emanuele; Ferrari, Jefferson Luis; Schiavon, Marco A.

doi:10.5935/0100-4042.20150150

Cited by 3 publications

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“…7 Trabalhos contendo propostas para introdução da nanociência em cursos de graduação envolvendo nanopartículas sintetizadas a partir de diferentes materiais (incluindo pontos de carbono, ouro e prata) já foram documentados. [31][32][33] Alguns autores demonstraram a aplicabilidade de aulas práticas sobre síntese de nanopartículas de prata e ouro. 32,33 Nesses trabalhos, além dos métodos de síntese, foram abordadas as principais propriedades ópticas -dependentes do formato e tamanho -e catalíticas das nanopartículas de ouro.…”

Section: Introductionunclassified

Uso de nanobastões de ouro para o desenvolvimento de aulas práticas de nanotecnologia

Ferreira¹,

Ladeira²,

Leite³

et al. 2017

Quim. Nova

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. A gold nanoparticles functionalization experiment was conducted in a biotechnology summer course at UFOP as a model for the introduction of the laboratory practice in nanotechnology for postgraduate courses in the areas of chemistry and biotechnology. The gold nanorods were synthesized by the seed method and then, functionalized with anti-IL-6 antibodies using the reagents EDAC/NHS and polyethyleneimine (PEI). This nanocompound was tested against the binding with the specific antigen (IL-6) and changes in the longitudinal plasmon absorption spectrum showed the coupling efficiency, which was also verified by the decrease in zeta potential. The experiment was satisfactory, with a positive feedback from participants, and could be implemented in nanotechnology practical classes from postgraduate courses, as a way for improve education in the emergent area of nanobiotechnology.Keywords: gold nanorods; surface plasmon resonance; nanotechnology experiment. INTRODUÇÃOO universo da nanotecnologia se expandiu consideravelmente na esfera da pesquisa científica em todo mundo nos últimos anos e constitui uma área que certamente acarretará em enormes retornos econômicos. Materiais e tecnologias em escala nanométrica têm sido empregados em diversas áreas, tais como no setor alimentício, sistemas de energia renovável, bioinformática e na medicina. 1-4 Além disso, constituem matéria-prima nobre para o desenvolvimento de dispositivos e sistemas multifuncionais que se adequam aos mais variados produtos e processos industriais.Perante a complexidade e relevância da nanotecnologia, emerge a necessidade de abordagens práticas e sistêmicas nos cursos de graduação e também de pós-graduação. Entretanto, apesar de já desenvolvidos e utilizados há algum tempo em pesquisas de diversas áreas, os conceitos da nanotecnologia ainda não são abordados em muitos cursos teóricos e práticos de pós-graduação no Brasil.Neste contexto, uma classe de nanomateriais de grande potencial tecnológico e educacional são as nanopartículas de ouro (AuNPs), que possuem propriedades ópticas, magnéticas e estruturais interessantes para aplicações químicas e biológicas. São ainda as nanopartículas metálicas mais estáveis que se tem conhecimento. 5,6 Elas podem ser sintetizadas em diversos tamanhos e formatos, tais como nanoesferas, nanobastões, nanogaiolas, nanoestrelas e nanoconchas. 5 A síntese das AuNPs geralmente é econômica, pois embora demande reagentes onerosos, estes são empregados em concentrações muito baixas. 7 Entre as várias aplicações das nanopartículas de ouro, o sensoriamento é tido como uma das áreas de maior interesse na atualidade. Nesse contexto, dentre as diferentes formas de nanopartículas, é dada grande atenção às nanoesferas e nanobastões de ouro. Isso se deve ao grande volume de conhecimento obtido sobre a característica mais peculiar das nanopartículas de ouro, a chamada ressonância plasmônica de superfície (SPR). A SPR se caracteriza pela oscilação coletiva dos elétrons de condução das partículas metálicas desencadeada pela exposição à ...

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Section: Introductionunclassified

Uso de nanobastões de ouro para o desenvolvimento de aulas práticas de nanotecnologia

Ferreira¹,

Ladeira²,

Leite³

et al. 2017

Quim. Nova

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“…As a consequence of these characteristics, a huge amount of publications exploring CQDs in different fields can be found in the literature [4][5][6]. However, the potential of CQDs in the educational field is still unknown given the low number of investigations [7]. In this sense, it is important to highlight the optical properties (absorption/emission) of CQDs.…”

Section: Introductionmentioning

confidence: 99%

Carbon Quantum Dots: A Safe Tool to Learn about Quantum Phenomenon in Nanomaterials

Cruz¹,

Freire²,

Carneiro³

et al. 2017

jlce

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In this paper, a lab experiment to demonstrate quantum phenomena was developed using carbon quantum dots (CQDs), a new carbon-based fluorescent nanomaterial, discovered in 2004. Therefore, a practical class was developed to demonstrate quantum phenomena using cheap and safe chemical products. Over 140 students from biotechnology, pharmacy, engineers and geology courses have successfully performed the proposed lab experiment. By following a short, easy and totally safe procedure, the students were able to synthesize CQDs, as well as to visualize the quantum phenomena related to the light scattering, absorption and emission. It was also possible to obtain the absorption spectrum of the CQD sample, with an absorption band at 325 nm. Additionally, a wavelength-dependent behavior was observed for the synthesized CQDs. This may be used to deeply study quantum confinement effects. Therefore, CQDs can be a powerful and versatile tool to learn about quantum phenomena in nanomaterials.

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“…In this instance, the absorption of UV radiation can promote the degradation of PEO due to the formation of hydroperoxides that decompose easily at room temperature 18 . Kaminska et al showed absorption bands at approximately 280 nm corresponding to poly(ethylene oxide) 19 , correlated with carbonyl C-O type n-π* transitions 20 . The monitoring of this region allowed to observe that, over time, there was an enlargement in the absorption band of the polymer, which suggests its decomposition.…”

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confidence: 99%

Degradation of Poly(Ethylene Oxide) Films Using Crystal Violet

et al. 2018

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The present study aimed to investigate the degradation of poly(ethylene oxide) (PEO) in the presence of cationic dye crystal violet irradiated under visible light. The preparation of the samples was done in the form of films obtained by casting. Degradation tests were carried out by 120 hours at room temperature. The degradation kinetics of the dye and polymer were accompanied by UV-Vis spectrophotometry and viscosimetry technique. The UV-Vis Spectra showed 81.2% degradation of the dye. In addition, it was observed a broadening of the absorption band of the polymer and the reduction of its viscosity, which features degradation. In this way, it is possible to affirm that the crystal violet dye, at the studied concentration, contributed to the degradation process of PEO.

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Preparation of Carbon Dots and Their Optical Characterization: An Experiment of Nanoscience for Undergraduate Course

Cited by 3 publications

References 0 publications

Uso de nanobastões de ouro para o desenvolvimento de aulas práticas de nanotecnologia

Uso de nanobastões de ouro para o desenvolvimento de aulas práticas de nanotecnologia

Carbon Quantum Dots: A Safe Tool to Learn about Quantum Phenomenon in Nanomaterials

Degradation of Poly(Ethylene Oxide) Films Using Crystal Violet

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