Surface Plasmon
Mostrando 13-24 de 298 artigos, teses e dissertações.
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13. All-Optical Logic Gates Devices based on SPP Coupling between Graphene Sheets
Abstract The aim of this work is to propose all-optical logic gates based on surface plasmon polaritons (SPP's) coupling among spatially separated graphene sheets. This model consists of graphene nanoribbons embedded in silica (SiO2) substrate place in a distance such that allow an efficient coupling between the plasmonic modes of the waveguides. It was nume
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-06
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14. Alternagin-C binding to α2β1 integrin controls matrix metalloprotease-9 and matrix metalloprotease-2 in breast tumor cells and endothelial cells
Abstract Background Matrix metalloproteinases (MMPs) are key players in tumor progression, helping tumor cells to modify their microenvironment, which allows cell migration to secondary sites. The role of integrins, adhesion receptors that connect cells to the extracellular matrix, in MMP expression and activity has been previously suggested. However, the m
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 24/05/2018
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15. Controlled synthesis of noble metal nanomaterials: motivation, principles, and opportunities in nanocatalysis
ABSTRACT This review describes some principles of the controlled synthesis of metal nanoparticles, focusing on how the fundamental understanding of their synthesis in the solution-phase can be put to tailor size, shape, composition, and architecture. The maneuvering over these parameters not only enable the tuning of properties, but also the maximization and
An. Acad. Bras. Ciênc.. Publicado em: 16/04/2018
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16. New trends in plasmonic (bio)sensing
Abstract The strong enhancement and localization of electromagnetic field in plasmonic systems have found applications in many areas, which include sensing and biosensing. In this paper, an overview will be provided of the use of plasmonic phenomena in sensors and biosensors with emphasis on two main topics. The first is related to possible ways to enhance t
An. Acad. Bras. Ciênc.. Publicado em: 2018
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17. Femtoliter Scale Detection of an Antithyroid Drug Using Gold Nanoparticles in a Microfluidic Chip
Sensitive detection of methimazole (MMI) at the femtoliter (fL) scale has been achieved based on photo thermal lensing of gold nanoparticles (GNPs). GNPs were used because their surface plasmon resonance (SPR) have absorption in visible range. A combined glass microfluidic chip-photo thermal lens microscopy (MFC-PTLM) system with appropriate laser source was
J. Braz. Chem. Soc.. Publicado em: 2017-10
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18. AgAu Nanotubes: Investigating the Effect of Surface Morphologies and Optical Properties over Applications in Catalysis and Photocatalysis
We herein report the preparation of AgAu nanotubes displaying controlled surface morphologies and optical properties by varying the reaction temperature during the galvanic reaction between Ag nanowires and AuCl4-(aq). As the AgAu nanotubes presented similar sizes and compositions, they enabled us to isolate the influence of surface morphology and optical pr
J. Braz. Chem. Soc.. Publicado em: 2017-09
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19. Phytofabrication of silver nanoparticles using Myriostachya wightiana as a novel bioresource, and evaluation of their biological activities
ABSTRACT Nanobiotechnology deals with the properties of nanomaterials and their potential uses. Here we report for the first time novel, cost-effective and eco-friendly method for the rapid green synthesis of silver nanoparticles (AgNPs) using leaf extracts of Myriostachya wightiana. The growth of silver nanoparticles was monitored by UV-vis spectroscopy co
Braz. arch. biol. technol.. Publicado em: 17/08/2017
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20. In Situ Photoactivated Plasmonic Ag3PO4@silver as a Stable Catalyst With Enhanced Photocatalytic Activity Under Visible Light
Silver orthophosphate (Ag3PO4) had been reported as an excellent candidate to split water or decompose pollutants with high efficiency in visible light region, yet is not stable due to the reduction of silver ion. In this work, an easy-fabricated method (in situ photoinduced reduction) was provided to enhance the stability of Ag3PO4 for its possible applicat
Mat. Res.. Publicado em: 03/04/2017
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21. Relação de dispersão para os plásmon-poláritons de superfície em uma interface plana metal/dielétrico
A plasmônica é uma disciplina emergente que investiga a interação entre a luz e os elétrons quase livres em sistemas metálicos em uma interface metal/dielétrico. Esta interação dá origem aos denominados Plásmon-Poláritons de Superfície SPPs (da sigla em inglês Surface Plasmon-Polaritons), que são um tipo de quasipartícula resultante do acopla
Rev. Bras. Ensino Fís.. Publicado em: 27/03/2017
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22. Green Synthesis of Gold Nanoparticles Using Sumac Aqueous Extract and Their Antioxidant Activity
Green synthesis of nanoparticles which have eco-friendly favourable solvent systems and environmentally reducing agents is of excessive importance. In this paper, we aimed to develop environmentally friendly, rapid and simple producer for the synthesis gold nanoparticles (Au-NPs) using aqueous extract of sumac as reducing agents for gold ions as well capping
Mat. Res.. Publicado em: 22/12/2016
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23. RESSONÂNCIA DE PLASMON DE SUPERFÍCIE LOCALIZADO E APLICAÇÃO EM BIOSSENSORES E CÉLULAS SOLARES
Within the last decades, the research on nanoparticles presenting localized surface plasmon resonance has increased constantly. In these materials, the interaction between electrons and incident light results in charge separation, enhancement of the electromagnetic field on the nanoparticles surface and in unique optical properties. Although many metals such
Quím. Nova. Publicado em: 2016-11
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24. Development of Surface Plasmon Resonance-Based Immunosensor for Detection of Brucella melitensis
A label-free optical immunosensor was developed based on surface plasmon resonance (SPR) method for rapid and selective detection of Brucella melitensis. This immunosensor was constructed by immobilizing capture antibody on 11-mercaptoundecanoic acid modified gold disk. This fabricated immunosensor detected B. melitensis at a concentration range from 103 to
J. Braz. Chem. Soc.. Publicado em: 2016-11