Os nanomateriais e a questão ambiental

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Translated abstract

The increasing use of nanomaterials in several products in different areas such as electronics, cosmetics, food and drugs has attracted the attention of the scientific community due to unknown properties of these materials, such as the life cycle and the interaction with receptor organisms once they reach the environment. In this context, the present work shows an updated scenario of nanomaterials applications, characterization methods and toxicity evaluation, also addressing important aspects related to the development and application of nanotechnology under the environmental point of view.

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Simple analytical expression for the peak-frequency shifts of plasmonic resonances for sensing

Jianji Yang, Harald Giessen, Philippe Lalanne (2015)

We derive a closed-form expression that accurately predicts the peak frequency-shift and broadening induced by tiny perturbations of plasmonic nanoresonators without critically relying on repeated electrodynamic simulations of the spectral response of nanoresonator for various locations, sizes or shapes of the perturbing objects. The force of the present approach, in comparison with other approaches of the same kind, is that the derivation is supported by a mathematical formalism based on a rigorous normalization of the resonance modes of nanoresonators consisting of lossy and dispersive materials. Accordingly, accurate predictions are obtained for a large range of nanoparticle shapes and sizes, used in various plasmonic nanosensors, even beyond the quasistatic limit. The expression gives quantitative insight, and combined with an open-source code, provides accurate and fast predictions that are ideally suited for preliminary designs or for interpretation of experimental data. It is also valid for photonic resonators with large mode volumes.

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Probing quantum confinement within single core-multishell nanowires

Gema Martínez-Criado, Alejandro Homs, Benito Alén … (2013)

Theoretically core-multishell nanowires under a cross-section of hexagonal geometry should exhibit peculiar confinement effects. Using a hard X-ray nanobeam, here we show experimental evidence for carrier localization phenomena at the hexagon corners by combining synchrotron excited optical luminescence with simultaneous X-ray fluorescence spectroscopy. Applied to single coaxial n-GaN/InGaN multiquantum-well/p-GaN nanowires, our experiment narrows the gap between optical microscopy and high-resolution X-ray imaging, and calls for further studies on the underlying mechanisms of optoelectronic nanodevices.

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Approaching magnetic ordering in graphene materials by FeCl\(_3\) intercalation

M. Craciun, A V Shytov, R Yakimova … (2015)

We show the successful intercalation of large area (1 cm\(^2\)) epitaxial few-layer graphene grown on 4H-SiC with FeCl\(_3\). Upon intercalation the resistivity of this system drops from an average value of \(\approx 200 \ \Omega/sq\) to \(\approx 16 \ \Omega/sq\) at room temperature. The magneto-conductance shows a weak localization feature with a temperature dependence typical of graphene Dirac fermions demonstrating the decoupling into parallel hole gases of each carbon layer composing the FeCl\(_3\) intercalated structure. The phase coherence length (\(\approx 1.2 \mu\)m at 280 mK) decreases rapidly only for temperatures higher than the 2-D magnetic ordering in the intercalant layer while it tends to saturate for temperatures lower than the antiferromagnetic ordering between the planes of FeCl\(_3\) molecules providing the first evidence for magnetic ordering in the extreme two-dimensional limit of graphene.

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Author and article information

Contributors

Matheus P. Paschoalino: Role: ND

Glauciene P. S. Marcone: Role: ND

Wilson F. Jardim: Role: ND

Journal

Journal ID (publisher): qn

Title: Química Nova

Abbreviated Title: Quím. Nova

Publisher: Sociedade Brasileira de Química (São Paulo )

ISSN: 1678-7064

Publication date (Print): 2010

Volume: 33

Issue: 2

Pages: 421-430

Affiliations

[1 ] Universidade Estadual de Campinas Brazil

Article

Publisher ID: S0100-40422010000200033

DOI: 10.1590/S0100-40422010000200033

SO-VID: 72b43cbb-016e-4228-9eb1-4696998550aa

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http://creativecommons.org/licenses/by/4.0/

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SciELO Brazil

Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0100-4042&lng=en

Os nanomateriais e a questão ambiental Translated title: Nanomaterials and the environment

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Translated abstract

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SciELO Brazil

Most cited references 88

Simple analytical expression for the peak-frequency shifts of plasmonic resonances for sensing

Probing quantum confinement within single core-multishell nanowires

Approaching magnetic ordering in graphene materials by FeCl\(_3\) intercalation

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