Gadolinium nanoparticle based switchable mirrors

quenching of hydrogenation-dehydrogenation hysteresis

I. Aruna, B. R. Mehta, L. K. Malhotra

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A continuous and reversible 'structural, optical, and electronic' transition between the reflecting metallic dihydride and transparent semiconducting trihydride states observed in rare earth metals on hydrogenation make these materials and their hydrides suitable for switchable mirror, sensing, and other technological applications. Recently Pd capped Gd nanoparticle based 'new generation' switchable mirrors have been fabricated with extended color neutrality, better optical contrast, and faster kinetics in comparison to the polycrystalline, epitaxial, alloy, and multilayer films. The present report aims at investigating the effect of nanoparticle nature on the hydrogenation- dehydrogenation hysteresis in switchable mirrors by carrying out in situ measurement of optical transmittance and electrode potentials during electrochemical hydrogen loading-deloading of Gd nanoparticle samples. Interestingly, Gd nanoparticle samples were observed to exhibit quenched hysteresis. The quenching of hysteresis in hydrogen-induced properties has been attributed to the absence of structural transition upon hydrogenation, reduction in topographical interlocking of the grains and elimination of lateral clamping of the slack nanoparticle layer to the substrate.

Original languageEnglish
Pages (from-to)1768-1774
Number of pages7
JournalJournal of Nanoscience and Nanotechnology
Volume7
Issue number6
DOIs
Publication statusPublished - 30 Jun 2007
Externally publishedYes

Fingerprint

Gadolinium
Dehydrogenation
gadolinium
dehydrogenation
Hydrogenation
hydrogenation
Hysteresis
Quenching
quenching
hysteresis
mirrors
Nanoparticles
nanoparticles
Hydrogen
Rare Earth Metals
dihydrides
Multilayer films
Opacity
hydrogen
in situ measurement

Keywords

  • Gd nanoparticle
  • hydrogenation
  • quenched hysteresis
  • switchable mirror

Cite this

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abstract = "A continuous and reversible 'structural, optical, and electronic' transition between the reflecting metallic dihydride and transparent semiconducting trihydride states observed in rare earth metals on hydrogenation make these materials and their hydrides suitable for switchable mirror, sensing, and other technological applications. Recently Pd capped Gd nanoparticle based 'new generation' switchable mirrors have been fabricated with extended color neutrality, better optical contrast, and faster kinetics in comparison to the polycrystalline, epitaxial, alloy, and multilayer films. The present report aims at investigating the effect of nanoparticle nature on the hydrogenation- dehydrogenation hysteresis in switchable mirrors by carrying out in situ measurement of optical transmittance and electrode potentials during electrochemical hydrogen loading-deloading of Gd nanoparticle samples. Interestingly, Gd nanoparticle samples were observed to exhibit quenched hysteresis. The quenching of hysteresis in hydrogen-induced properties has been attributed to the absence of structural transition upon hydrogenation, reduction in topographical interlocking of the grains and elimination of lateral clamping of the slack nanoparticle layer to the substrate.",
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Gadolinium nanoparticle based switchable mirrors : quenching of hydrogenation-dehydrogenation hysteresis. / Aruna, I.; Mehta, B. R.; Malhotra, L. K.

In: Journal of Nanoscience and Nanotechnology, Vol. 7, No. 6, 30.06.2007, p. 1768-1774.

Research output: Contribution to journalArticle

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AU - Mehta, B. R.

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AB - A continuous and reversible 'structural, optical, and electronic' transition between the reflecting metallic dihydride and transparent semiconducting trihydride states observed in rare earth metals on hydrogenation make these materials and their hydrides suitable for switchable mirror, sensing, and other technological applications. Recently Pd capped Gd nanoparticle based 'new generation' switchable mirrors have been fabricated with extended color neutrality, better optical contrast, and faster kinetics in comparison to the polycrystalline, epitaxial, alloy, and multilayer films. The present report aims at investigating the effect of nanoparticle nature on the hydrogenation- dehydrogenation hysteresis in switchable mirrors by carrying out in situ measurement of optical transmittance and electrode potentials during electrochemical hydrogen loading-deloading of Gd nanoparticle samples. Interestingly, Gd nanoparticle samples were observed to exhibit quenched hysteresis. The quenching of hysteresis in hydrogen-induced properties has been attributed to the absence of structural transition upon hydrogenation, reduction in topographical interlocking of the grains and elimination of lateral clamping of the slack nanoparticle layer to the substrate.

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