Nano Archive

Gadolinium Nanoparticle Based Switchable Mirrors: Quenching of Hydrogenation-Dehydrogenation Hysteresis

Aruna, I. and Mehta , B. R and Malhotra, L. K. (2007) Gadolinium Nanoparticle Based Switchable Mirrors: Quenching of Hydrogenation-Dehydrogenation Hysteresis. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 7 (6). 1768-1774(7). ISSN 1533-4880

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Official URL: http://www.ingentaconnect.com/content/asp/jnn/2007...

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.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:5057
Deposited By:JNCASR
Deposited On:27 May 2009 10:24
Last Modified:27 May 2009 10:24

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