Navegação por assunto "plasmons"

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  • IPEN-DOC 18305

    ASSUMPÇÃO, THIAGO A.A. de; SILVA, DAVINSON M. da; CAMILO, MAURICIO E.; KASSAB, LUCIANA R.P.; GOMES, ANDERSON S.L.; ARAUJO, CID B. de; WETTER, NIKLAUS U. . Frequency upconversion properties of Tmsup(3+) doped TeOsub(2)-ZnO glasses containing silver nanoparticles. Journal of Alloys and Compounds, v. 536, Suppl. 1, p. 504-506, 2012.

    Palavras-Chave: materials; nanostructures; rare earth compounds; thulium; doped materials; tellurium oxides; zinc oxides; optical properties; luminescence; plasmons

  • IPEN-DOC 19906

    ASSUMPÇÃO, THIAGO A.A. de; SILVA, DAVINSON M. da; KASSAB, LUCIANA R.P.; GOMES, ANDERSON S.L.; ARAUJO, CID B. de; WETTER, NIKLAUS U. . Frequency upconversion properties of Tmsup(3+) doped TeOsub(2)-ZnO glasses containing silver nanoparticles. In: INTERNATIONAL SYMPOSIUM ON METASTABLE AMORPHOUS AND NANOSTRUCTURED MATERIALS, 18th, June 26 - july 1, 2011, Gijon, Spain. Abstract... 2011.

    Palavras-Chave: materials; nanostructures; rare earth compounds; thulium; doped materials; tellurium oxides; zinc oxides; optical properties; luminescence; plasmons

  • IPEN-DOC 29000

    FAROOQ, SAJID ; RATIVA, DIEGO; SAID, ZAFAR; ARAUJO, RENATO E. de. High performance blended nanofluid based on gold nanorods chain for harvesting solar radiation. Applied Thermal Engineering, v. 218, p. 1-7, 2023. DOI: 10.1016/j.applthermaleng.2022.119212

    Abstract: Colloids composed of metallic nanoparticles are promising working fluids for solar radiation harvesting using Direct Absorption Solar Collectors (DASC), due to a high thermal conductivity characteristic and a broad optical absorption that can be tuned to match the solar spectrum. Recently, different studies report gold nanorod (Au-NR) chains for biosensing and photothermal applications, which have broadband and high absorption cross-section and potential possibilities to orientate the nanoparticle using electromagnetic fields. Moreover, colloids with nanoparticles blended configuration show an efficient solar radiation absorption characteristics. Here, working fluids for DASC based on gold nanorod chains in an unblended and blended configuration are evaluated using numerical simulations. The results indicate that the solar absorption increases proportional to the size of the Au-NR assembly, and the best configuration is obtained for a tetramer structure. By using different blended arrangements such as single Au monomers, dimers, trimmers, and tetramers nanorods, it is possible to obtain solar weighted absorption coefficients close to an ideal solar thermal collector, even obtained at low volume fraction (1×10(−5)). Moreover, the results show an enhancement of the temperature of 58.45 °C for tetramer compared with a monomer structure, both under one sun excitation. Therefore, the Au-NR assembly shows a high potentiality to be explored as a high-performance working fluid for solar thermal collectors.

    Palavras-Chave: colloids; plasmons; nanoparticles; solar collectors; thermal conductivity; gold

  • IPEN-DOC 27770

    LOPES, CARLA R.B.; SANTOS JUNIOR, DARIO; SILVA, FLAVIA R. de O. ; COURROL, LILIA C.. High‑sensitivity Hg2+ sensor based on the optical properties of silver nanoparticles synthesized with aqueous leaf extract of Mimusops coriacea. Applied Physics A: Materials Science and Processing, v. 127, n. 4, p. 1-13, 2021. DOI: 10.1007/s00339-021-04391-2

    Abstract: In the presented manuscript, spherical silver nanoparticles (AgNPs) which were prepared via green chemical method in a single step take only a few minutes to be ready as a Hg2+ ions detector based on the plasmon band changes. The AgNPs were obtained with the aqueous extract of Mimusops coriacea leaves. The components of the extract as tannins and polyphenolic compounds were responsible for the reduction in metal ions and the particles encapsulation. The AgNPs were characterized by UV–Vis spectroscopy, fluorescence, Fourier transform infrared, dynamic light scattering analysis and transmission electron microscopy. The AgNps presented an average diameter of 15 nm and a zeta potential value of ~ − 28 mV. They were monodispersed and stable for up to 180 days. AgNPs are used as a Hg2+ sensor with high sensitivity and selectivity. The fast, simple and low-cost method is based on changes in the AgNP surface plasmon resonance band (λ ≈ 410 nm) with LOD 6.5 ng/mL (32.5 nM), without functionalization of the AgNPs. The low LOD demonstrates its potential for Hg2+ quantification in environmental samples such as fish, soil, and effluent discharge.

    Palavras-Chave: sensors; silver; nanoparticles; sensitivity; synthesis; plasmons; surfaces; silver nitrates; transmission electron microscopy

  • IPEN-DOC 24862

    GEONMONOND, RAFAEL S.; QUIROZ, JHON; ROCHA, GUILHERME F.S.R.; OROPEZA, FREDDY E.; RANGEL, CLARA J.; RODRIGUES, THENNER S. ; HOFMANN, JAN P.; HENSEN, EMIEL J.M.; ANDO, ROMULO A.; CAMARGO, PEDRO H.C.. Marrying SPR excitation and metal–support interactions: unravelling the contribution of active surface species in plasmonic catalysis. Nanoscale, v. 10, n. 18, p. 8560-8568, 2018. DOI: 10.1039/c8nr00934a

    Abstract: Plasmonic catalysis takes advantage of the surface plasmon resonance (SPR) excitation to drive or accelerate chemical transformations. In addition to the plasmonic component, the control over metal–support interactions in these catalysts is expected to strongly influence the performances. For example, CeO2 has been widely employed towards oxidation reactions due to its oxygen mobility and storage properties, which allow for the formation of Ce3+ sites and adsorbed oxygen species from metal–support interactions. It is anticipated that these species may be activated by the SPR excitation and contribute to the catalytic activity of the material. Thus, a clear understanding of the role played by the SPR-mediated activation of surface oxide species at the metal–support interface is needed in order to take advantage of this phenomenon. Herein, we describe and quantify the contribution from active surface oxide species at the metal–support interface (relative to O2 from air) to the activities in green SPR-mediated oxidation reactions. We employed CeO2 decorated with Au NPs (Au/CeO2) as a model plasmonic catalyst and the oxidation of p-aminothiophenol (PATP) and aniline as proof-of-concept transformations. We compared the results with SiO2 decorated with Au NPs (Au/SiO2), in which the formation of surface oxide species at the metal–support interface is not expected. We found that the SPR-mediated activation of surface oxide species at the metal–support interface in Au/CeO2 played a pivotal role in the detected activities, being even higher than the contribution coming from the activation of O2 from air.

    Palavras-Chave: catalysis; catalysts; plasmons; resonance; surfaces; oxidation; gold; nanostructures; spheres

  • IPEN-DOC 28859

    FAROOQ, SAJID ; WALI, FAIZ; ZEZELL, DENISE M. ; ARAUJO, RENATO E. de; RATIVA, DIEGO. Optimizing and quantifying gold nanospheres based on LSPR label-free biosensor for dengue diagnosis. Polymers, v. 14, n. 8, p. 1-12, 2022. DOI: 10.3390/polym14081592

    Abstract: The localized surface plasmon resonance (LSPR) due to light–particle interaction and its dependence on the surrounding medium have been widely manipulated for sensing applications. The sensing efficiency is governed by the refractive index-based sensitivity (ηRIS) and the full width half maximum (FWHM) of the LSPR spectra. Thereby, a sensor with high precision must possess both requisites: an effective ηRIS and a narrow FWHM of plasmon spectrum. Moreover, complex nanostructures are used for molecular sensing applications due to their good ηRIS values but without considering the wide-band nature of the LSPR spectrum, which decreases the detection limit of the plasmonic sensor. In this article, a novel, facile and label-free solution-based LSPR immunosensor was elaborated based upon LSPR features such as extinction spectrum and localized field enhancement. We used a 3D full-wave field analysis to evaluate the optical properties and to optimize the appropriate size of spherical-shaped gold nanoparticles (Au NPs). We found a change in Au NPs’ radius from 5 nm to 50 nm, and an increase in spectral resonance peak depicted as a red-shift from 520 nm to 552 nm. Using this fact, important parameters that can be attributed to the LSPR sensor performance, namely the molecular sensitivity, FWHM, ηRIS, and figure of merit (FoM), were evaluated. Moreover, computational simulations were used to assess the optimized size (radius = 30 nm) of Au NPs with high FoM (2.3) and sharp FWHM (44 nm). On the evaluation of the platform as a label-free molecular sensor, Campbell’s model was performed, indicating an effective peak shift in the adsorption of the dielectric layer around the Au NP surface. For practical realization, we present an LSPR sensor platform for the identification of dengue NS1 antigens. The results present the system’s ability to identify dengue NS1 antigen concentrations with the limit of quantification measured to be 0.07 μg/mL (1.50 nM), evidence that the optimization approach used for the solution-based LSPR sensor provides a new paradigm for engineering immunosensor platforms.

    Palavras-Chave: plasmons; resonance; surfaces; nanostructures; sensors; sensitivity; optimization

  • IPEN-DOC 24781

    RIBEIRO, MARTHA S. ; MELO, LUCIANA S.A. de; FAROOQ, SAJID; BAPTISTA, ALESSANDRA ; KATO, ILKA T.; NUNEZ, SILVIA C.; ARAUJO, RENATO E. de. Photodynamic inactivation assisted by localized surface plasmon resonance of silver nanoparticles: in vitro evaluation on Escherichia coli and Streptococcus mutans. Photodiagnosis and Photodynamic Therapy, v. 22, p. 191-196, 2018. DOI: 10.1016/j.pdpdt.2018.04.007

    Abstract: Localized surface plasmon resonance (LSPR) of gold nanoparticles has been reported to increase the antimicrobial effect of the photodynamic therapy. Although silver nanoparticles (AgNPs) are an efficient growth inhibitor of microorganisms, no studies exploring LSPR of AgNPs to enhance the photodynamic inactivation (PDI) have been related. In this work, we described the LSPR phenomenon of AgNP sand investigated its interaction with riboflavin, a natural photosensitizer. We evaluated the use of AgNPs coated with pectin (p-AgNP) in riboflavin (Rb)-mediated PDI of Escherichia colt (Gram- bacteria) and Streptococcus mutans (Gram + bacteria) using a blue light-emitting diode (lambda = 455 +/- 20 nm) of optical power 200 mW. Irradiance was 90 mW/cm(2) and radiant exposure varied according to the time exposure. Uptake of Rb and p-AgNP by the cells was evaluated by measuring the supernatant absorption spectra of the samples. We observed that LSPR of p-AgNPs was able to enhance the riboflavin photodynamic action on S. mutans but not on E. colt, probably due to the lower uptake of Rb by E. colt. Taken together, our results provide insights to explore the use of the LPRS promoted by silver nanostructures to optimize antimicrobial PDI protocols.

    Palavras-Chave: surfaces; plasmons; resonance; photosensitivity; inactivation; nanoparticles; silver; antimicrobial agents; light emitting diodes; bacterial spores; streptococcus; escherichia coli

  • IPEN-DOC 29715

    BALTAR, RAPHAEL M.S.M.; FAROOQ, SAJID ; ARAUJO, RENATO E. de. Selecting plasmonic nanoshells for colorimetric sensors. Journal of the Optical Society of America B, v. 40, n. 4, p. C40-C47, 2023. DOI: 10.1364/JOSAB.479446

    Abstract: In this work, the use of gold and silver nanoshells was evaluated as a starting point for the establishment of colorimetric sensor platforms. The sensitivity and linearity of the nanoplatforms (SiO2 core–metallic shell nanoparticles) were assessed under the influence of the nanoshell configuration, color space, and light source illuminant. A computational procedure for selecting high-performance plasmonic colorimetric sensor platforms is described. The evaluation methodology involves considering five different color spaces and 15 different color components. By exploring crucial figures of merit for sensing, the performance of the plasmonic nanoplatforms was evaluated, exploring Mie theory. We determined that gold nanoshells are highly efficient on colorimetric sensing, while silver nanoshells are a better choice for spectroscopic sensors. Plasmonic nanoplatforms based on nanoshells with 10 nm SiO2 core radii and 5 nm thick Au shells presented sensitivity values up to 4.70 RIU−1 , considering the hue angle of the HSV color space. Color variation of up to 40% was observed, due to the adsorption of a 10 nm thick molecular layer on the gold nanoshell surface. In the search for advances in colorimetric biosensors, the optimization approach used in this work can be extended to different nanostructures.

    Palavras-Chave: plasmons; nanostructures; colorimetric dosemeters; gold

  • IPEN-DOC 29299

    BALTAR, RAPHAEL M.S.M.; ARAUJO, RENATO E. de; FAROOQ, SAJID . Selecting silver nanoshells for colorimetric sensors. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 13-15, 2022, Recife, PE. Proceedings... Piscataway, NJ, USA: IEEE, 2022. DOI: 10.1109/SBFotonIOPC54450.2022.9992430

    Abstract: In this work the use of silver nanoshell as a starting point for the establishment of colorimetric sensor platforms, under solar illumination, was evaluated. Mie theory was explored on the analysis of the nanosensor linearity and sensitivity, considering 4 different color spaces and the influence of the nanoshell geometry. A high performance plasmonic nanoplatform was identified. The nanosensor platform based on nanoshells, with 35 nm SiO 2 core radius and 25 nm Ag shell thickness, showed sensitivity values up to 2.78 RIU -1 and linearity higher than 0.96, considering the Hue parameter of the HSV color space. The identification of optimized plasmonic nanoplatforms may extend the use naked-eye colorimetric applications in low-resource environments.

    Palavras-Chave: optical equipment; sensors; nanotechnology; plasmons; silver

  • IPEN-DOC 29086

    FAROOQ, SAJID ; SHAFIQUE, SHAREEN; AHSAN, ZISHAN; CARDOZO, OLAVO; WALI, FAIZ. Tailoring the scattering response of optical nanocircuits using modular assembly. Nanomaterials, v. 12, n. 17, p. 1-12, 2022. DOI: 10.3390/nano12172962

    Abstract: Owing to the localized plasmon resonance of an ensemble of interacting plasmonic nanoparticles (NPs), there has been a tremendous drive to conceptualize complex optical nanocircuits with versatile functionalities. In comparison to modern research, there is still not a sufficient level of sophistication to treat the nanostructures as lumped circuits that can be adjusted into complex systems on the basis of a metatronic touchstone. Here, we present the design, assembly, and characterization of single relatively complex photonic nanocircuits by accurately positioning several metallic and dielectric nanoparticles acting as modular lumped elements. In this research, Au NPs along with silica NPs were used to compare the proficiency and precision of our lumped circuit model analytically. On increasing the size of an individual Au NP, the spectral peak resonance not only modifies but also causes more scattering efficiency which increases the fringe capacitance linearly and decreases the nanoinductance of lumped circuit element. The NPs-based assembly induced the required spectral resonance ascribed by simple circuit methods and are depicted to be actively reconfigurable by tuning the direction or polarization of input signals. Our work demonstrates a vital step toward developing the modern modular designing tools of complex electronic circuits into nanophotonic-related applications.

    Palavras-Chave: plasmons; nanomaterials; elements; nanoparticles; electronic circuits

  • IPEN-DOC 29718

    FAROOQ, SAJID ; VITAL, CAIO V.P.; TIKHONOWSKI, GLEB; POPOV, ANTON A.; KLIMENTOV, SERGEY M.; MALAGON, LUIS A.G.; ARAUJO, RENATO E. de; KABASHIN, ANDREI V.; RATIVA, DIEGO. Thermo-optical performance of bare laser-synthesized TiN nanofluids for direct absorption solar collector applications. Solar Energy Materials and Solar Cells, v. 252, p. 1-10, 2023. DOI: 10.1016/j.solmat.2023.112203

    Abstract: Titanium nitride (TiN) nanoparticles (NPs) look very promising for solar energy harvesting owing to a strong plasmonic absorption with the maximum in the near-infrared range. However, the synthesis of TiN nanofluids is very challenging as one has to combine the plasmonic feature and long-term colloidal stability to withstand harsh conditions of direct absorption solar collectors (DASC). Here, we explore solutions of bare (ligand free) TiN NPs synthesized by pulsed laser ablation in acetone as the nanofluid. We show that such NPs are low size-dispersed (mean size 25 nm) and exhibit a broad absorption peak around 700 nm, while their negative charge ensures a prolonged electrostatic stabilization of solutions. Solar weighted absorption coefficient of such TiN nanofluids reaches 95.7% at very low volume fractions (1.0 × 10−5), while nanofluid temperature can be increased up to 29 °C under 1.25-sun illumination. Our data evidence that the thermal efficiency of a DASC using TiN nanofluid is 80% higher compared to Au-based counterparts. The recorded high photothermal efficiency and excellent colloidal stability of TiN nanofluids promises a major advancement of DASC technology, while laser-ablative synthesis can offer easy scalability and relative cost-efficiency required for the implementation of systems for solar energy harvesting.

    Palavras-Chave: nanofluids; titanium nitrides; plasmons; solar energy; lasers; ablation

  • IPEN-DOC 22490

    CORDEIRO, THIAGO da S. ; MATOS, RICARDO A. de; SILVA, FLAVIA R. de O. ; VIEIRA JUNIOR, NILSON D. ; COURROL, LILIA C. ; SAMAD, RICARDO E. . Using femtosecond lasers to modify sizes of gold nanoparticles. In: ANDREWS, DAVID L. (Ed.); MUNZI, JEAN-MICHEL (Ed.); OSTENDORF, ANDREAS (Ed.) NANOPHOTONICS, 6th, April 3, 2016, Brussels, Belgium. Proceedings... Society of Photo-optical Instrumentation Engineers, 2016. p. 988439-1 - 988439-9. (SPIE Proceedings Series, 9884).

    Palavras-Chave: lasers; size; gold; nanoparticles; plasmons; production; irradiation; fragmentation

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A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.