By Luciano De Sio
Plasmonic nanoparticles (NPs) characterize a superb type of nanomaterials that experience the aptitude to localize mild on the nanoscale through exploiting a phenomenon known as localized plasmon resonance. The ebook is aimed toward reviewing contemporary efforts dedicated to make the most of NPs in lots of examine fields, reminiscent of photonics, optics, and plasmonics. during this framework, specific curiosity is dedicated to active plasmonics, a fairly large idea that exhibits these functions during which NPs play an lively position, like awareness of gain-assisted skill, usage of NPs embedded in liquid crystalline and versatile fabrics, and exploitation of renewable solar power. The ebook places jointly contributions from extraordinary study teams within the box of plasmonic nanomaterials worldwide. It offers uncomplicated and complicated wisdom within the fields of plasmonics, photonics, and optics and covers examine on plasmonic nanomaterials for functions starting from plasmonics to photonics.
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Extra resources for Active plasmonic nanomaterials
SPR can be observed when the wavelength of incident light far exceeds the particle diameter. In the “intrinsic size” region (< 5 nm), noble metal NPs do not show any plasmon absorption, while the absorption of particles larger than 50–60 nm (“extrinsic size” region) is broad and covers most of the visible region. Such properties are mainly observed in Au, Ag, and Cu NPs, because of the presence of free conduction electrons, which are absent in the individual atoms as well as in the bulk . © 2016 by Taylor & Francis Group, LLC 35 May 27, 2015 10:53 PSP Book - 9in x 6in 36 Synthesis and Surface Engineering of Plasmonic Nanoparticles The great interest in plasmonic NPs, especially for Au and Ag ones, arises from the wide potential for applications in diﬀerent ﬁelds, which include sensing, nanomedicine, photovoltaics and optics [34, 60, 96, 106, 115].
Top-down method means that bulk materials are broken into small pieces or, alternatively, carved at nanoscale range to generate NPs of desired dimensions. Common top-down techniques are photolithography, electron beam lithography, and laser ablation . Bottom-up strategies provide metal NPs starting from individual species that undergo a chemical or biological reduction to provide metal atoms that assemble one by one in nanosized structures. In this chapter, we will focus on common bottom-up methods that include templated chemical, electrochemical, sonochemical, thermal, and photochemical reduction techniques.
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Active plasmonic nanomaterials by Luciano De Sio