Chapter 228 Switchable Metal Hydride Films

Ivaturi, Aruna; Malhotra, L.K.; Mehta, B. R.

doi:10.1016/s0168-1273(06)36002-3

Cited by 6 publications

(3 citation statements)

References 171 publications

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“…The decrease in extinction toward longer wavelengths can be attributed to the tail of a very strong and broad electronic resonance at about 3.1 eV (400 nm) . In contrast to Y, YH 2 is a good metal with a markedly different atomic and electronic structure. ,, To transform the yttrium into YH 2 , we expose our sample to 4 vol % hydrogen in nitrogen for 10 min. According to literature, this is more than sufficient to reach the dihydride and even the trihydride state .…”

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confidence: 99%

Yttrium Hydride Nanoantennas for Active Plasmonics

Strohfeldt,

Tittl,

Schäferling

et al. 2014

Nano Lett.

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A key challenge for the development of active plasmonic nanodevices is the lack of materials with fully controllable plasmonic properties. In this work, we demonstrate that a plasmonic resonance in top-down nanofabricated yttrium antennas can be completely and reversibly turned on and off using hydrogen exposure. We fabricate arrays of yttrium nanorods and optically observe, in extinction spectra, the hydrogen-induced phase transition between the metallic yttrium dihydride and the insulating trihydride. Whereas the yttrium dihydride nanostructures exhibit a pronounced particle plasmon resonance, the transition to yttrium trihydride leads to a complete vanishing of the resonant behavior. The plasmonic resonance in the dihydride state can be tuned over a wide wavelength range by simply varying the size of the nanostructures. Furthermore, we develop an analytical diffusion model to explain the temporal behavior of the hydrogen loading and unloading trajectories observed in our experiments and gain information about the thermodynamics of our device. Thus, our nanorod system serves as a versatile basic building block for active plasmonic devices ranging from switchable perfect absorbers to active local heating control elements.

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confidence: 99%

Yttrium Hydride Nanoantennas for Active Plasmonics

Strohfeldt,

Tittl,

Schäferling

et al. 2014

Nano Lett.

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“…Hydrogenation depends on the metal to hydride formation, which usually leads to phase transitions, meaning that the material changes from a metal to a semiconductor [317] and therefore, the metallic film becomes transparent [318]. Under these circumstances, the optical and electronic properties could be switched between those of the highly reactive metallic state and the semiconducting hydride states by subsequent loading and unloading of hydrogen [209,319], allowing for real-time visualization of transmittance, reflectance and resistivity changes during hydrogen incorporation into the lattice structure [319].…”

Section: Optical Switches For Hydrogen Storagementioning

confidence: 99%

Nanomaterials by design: a review of nanoscale metallic multilayers

Sáenz-Trevizo

Hodge

2020

Nanotechnology

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Nanoscale metallic multilayers have been shown to have a wide range of outstanding properties, which differ to a great extent from those observed in monolithic films. Their exceptional properties are mainly associated with the large number of interfaces and the nanoscale layer thicknesses. Many studies have investigated these materials focusing on magnetic, mechanical, optical, or radiation tolerance properties. Thus, this review provides a summary of the findings in each area, including a description of the general attributes, the adopted synthesis methods and most common characterization techniques used. This information is followed by a compendium of the material properties and a brief discussion of related experimental data, as well as existing and promising applications. Other phenomena of interest, including thermal stability studies, self-propagating reactions and the progression from nano multilayers to amorphous and/or crystalline alloys, are also covered. In general, this review highlights the use of nano multilayer architectures as viable routes to overcome the challenges of designing and implementing new engineering materials at the nanoscale.

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“…Switchable mirrors, display devices and smart windows are some of the potential applications based on such M-I transitions (Huiberts et al 1996;Aruna et al 2006). The M-I transition is observed in both types of rare earth metals: light rare earth La (Greissen et al 1997) and Pr (Mor et al 2001;Kala and Mehta 2007a, b), and heavy rare earth Sm (Kumar et al 2002), Gd (Aruna et al 2004), Dy (Azofeifa and Clark 1997), and Ho (Grier et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-induced electrical and optical switching in Pd capped Pr nanoparticle layers

Kala

Mehta

2008

Bull Mater Sci

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In this study, modification in the properties of hydrogen-induced switchable mirror based on Pr nanoparticle layers is reported. The reversible changes in hydrogen-induced electrical and optical properties of Pd capped Pr nanoparticle layers have been studied as a function of hydrogenation time and compared with the conventional device based on Pd capped Pr thin films. Faster electrical and optical response, higher optical contrast and presence of single absorption edge corresponding to Pr trihydride state in hydrogen loaded state have been observed in the case of nanoparticle layers. The improvement in the electrical and optical properties have been explained in terms of blue shift in the absorption edge due to quantum confinement effect, larger number of interparticle boundaries, presence of defects, loose adhesion to the substrate and enhanced surface to volume atom ratio at nanodimension.

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Chapter 228 Switchable Metal Hydride Films

Cited by 6 publications

References 171 publications

Yttrium Hydride Nanoantennas for Active Plasmonics

Yttrium Hydride Nanoantennas for Active Plasmonics

Nanomaterials by design: a review of nanoscale metallic multilayers

Hydrogen-induced electrical and optical switching in Pd capped Pr nanoparticle layers

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