Shape-Controlled Synthesis and Surface Plasmonic Properties of Metallic Nanostructures

Xia, Younan; Halas, Naomi J.

doi:10.1557/mrs2005.96

Cited by 879 publications

(744 citation statements)

References 29 publications

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“…With the increase in the particle size, the optical absorption spectra of metal nanoparticles that are dominated by surface plasmon resonances (SPR) shift towards longer wavelengths. The position of absorption band also strongly depends upon dielectric constant of the medium and surface-adsorbed species [22]. As indicated by Mie's theory, spherical nanoparticles give rise to a single SPR band in the absorption spectra, whereas anisotropic particles confer two or more SPR bands depending on the shape of the particles [23].…”

Section: Uv -Visible Studiesmentioning

confidence: 99%

Extracellular synthesis of silver nanoparticles using dried leaves of pongamia pinnata (L) pierre

et al. 2010

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Extract of oven dried leaves of Pongamia pinnata (L) Pierre was used for the synthesis of silver nanoparticles. Stable and crystalline silver nanoparticles were formed by the treatment of aqueous solution of AgNO 3 (1mM) with dried leaf extract of Pongamia pinnata (L) Pierre. UV-visible spectroscopy studies were carried out to quantify the formation of silver nanoparticles. Transmission electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy were used to characterize the silver nanoparticles. TEM image divulges that silver nanoparticles are quite polydispersed, the size ranging from 20 nm to 50 nm with an average of 38 nm. Water soluble heterocyclic compounds such as flavones were mainly responsible for the reduction and stabilization of the nanoparticles. Silver nanoparticles were effective against Escherichia coli (ATCC 8739), Staphylococcus aureus (ATCC 6538p), Pseudomonas aeruginosa (ATCC 9027) and Klebsiella pneumoniae (clinical isolate). The move towards extracellular synthesis using dried biomass appears to be cost effective, eco-friendly to the conventional methods of nanoparticles synthesis.

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Section: Uv -Visible Studiesmentioning

confidence: 99%

Extracellular synthesis of silver nanoparticles using dried leaves of pongamia pinnata (L) pierre

et al. 2010

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“…The dimensions of the components in such devices range from several tens to several hundred nanometers and their properties are readily predicted adopting the principles of classical electromagnetism [1][2][3][4][5][6]. On the other hand, fabrication techniques based on self-assembly, such as colloid synthesis, wet-chemical electrodeposition and molecular beam epitaxy, are also powerful methods of fabricating plasmonic materials with even smaller dimensions [8,10,11].…”

Section: Introductionmentioning

confidence: 99%

Plasmons in nanoscale and atomic-scale systems

Nagao

Han

Hoang

et al. 2010

Science and Technology of Advanced Materials

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Plasmons in metallic nanomaterials exhibit very strong size and shape effects, and thus have recently gained considerable attention in nanotechnology, information technology, and life science. In this review, we overview the fundamental properties of plasmons in materials with various dimensionalities and discuss the optical functional properties of localized plasmon polaritons in nanometer-scale to atomic-scale objects. First, the pioneering works on plasmons by electron energy loss spectroscopy are briefly surveyed. Then, we discuss the effects of atomistic charge dynamics on the dispersion relation of propagating plasmon modes, such as those for planar crystal surface, atomic sheets and straight atomic wires. Finally, standing-wave plasmons, or antenna resonances of plasmon polariton, of some widely used nanometer-scale structures and atomic-scale wires (the smallest possible plasmonic building blocks) are exemplified along with their applications.

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“…When the nanostructures are non-spherical and exhibit higher growth in one dimension, to form wires or rods, the plasmon band splits into two bands, corresponding to oscillation of the conducting electrons along (longitudinal) and perpendicular (transverse) to the long axis (Xia and Halas, 2005). The transverse mode resonance resembles the observed peak for spheres, but the longitudinal mode is considerably red-shifted and depends strongly on the difference in length compared to width.…”

Section: Noble Metal Nanoparticles Fascinating Optical Propertiesmentioning

confidence: 90%

Environmentally responsive polymeric "intelligent" materials: the ideal components of non-mechanical valves that control flow in microfluidic systems

Morones‐Ramírez¹

2010

Braz. J. Chem. Eng.

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-Miniaturization and commercialization of integrated microfluidic systems has had great success with the development of a wide variety of techniques in microfabrication, since they allowed their construction at a low cost and by following simple step-series procedures. However, one of the major challenges in the design of microfluidic systems is to achieve control of flow and delivery of different chemical reagents. This feature is especially important when using microfluidic systems in the development of cell culture systems, the construction of labs on a chip and the fabrication and design of chemical microreactors. Spatiotemporal control of the microenvironment in microfluidic devices has been only partially achieved by incorporating actuator parts (mechanical and non-mechanical) within these devices; nevertheless, recently there has been enormous progress due to advances in the materials sciences, and the development of novel polymeric "intelligent" materials. These materials have proved to be excellent candidates in the construction of non-mechanical actuators in the form of environmentally responsive valves. These valves can more efficiently control flows because these "intelligent" materials are capable of undergoing conformational changes and phase transitions in response to different local or external environmental stimuli; allowing them to turn the valves from "on" to "off". In addition, these valves have very simple designs, and are easy and cheap to incorporate into microfluidic systems. Therefore, although there are many reviews that focus on the development and design of non-mechanical actuators, the following review proceeds to describe the exciting characteristics, potential uses and synthesis methods of the building blocks of the most recent and innovative non-mechanical valves, environmentally responsive polymeric "intelligent" materials. In addition, the last section of this review will focus on the synthesis of composite materials that are capable of responding to more than one type of stimulus, since these materials are believed to be the future components that will boost the development of microfluidic systems with spatiotemporal controlled microenvironments.

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Shape-Controlled Synthesis and Surface Plasmonic Properties of Metallic Nanostructures

Cited by 879 publications

References 29 publications

Extracellular synthesis of silver nanoparticles using dried leaves of pongamia pinnata (L) pierre

Extracellular synthesis of silver nanoparticles using dried leaves of pongamia pinnata (L) pierre

Plasmons in nanoscale and atomic-scale systems

Environmentally responsive polymeric "intelligent" materials: the ideal components of non-mechanical valves that control flow in microfluidic systems

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