Hydrogen induced changes in the optical properties of Pd capped V thin films

Azofeifa, D. E.; Clark, N.J.; Vargas, William E.; Solís, Hugo; Pálsson, Gunnar K.; Hjörvarsson, Bjørgvin

doi:10.1016/j.jallcom.2013.03.146

Cited by 5 publications

(7 citation statements)

References 25 publications

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“…Over the visible wavelength range previously reported, our V metal data exhibits similar trends . Band structure theory predicts that there should be two absorption peaks in the data centered at 406 and 708 nm .…”

Section: Resultssupporting

confidence: 82%

“…Over the visible wavelength range previously reported, our V metal data exhibits similar trends. 27 Band structure theory predicts that there should be two absorption peaks in the data centered at 406 and 708 nm. 45 In the literature, it has been observed that thermal broadening merges these peaks into one broad peak.…”

Section: V/vhxmentioning

confidence: 99%

“…No systematic work has compared a wide range of materials (here Pd, Mg, Zr, Ti, and V) prepared and tested under identical broadband illumination and time-dependent hydrogenation conditions. Further, none of referenced studies include direct in situ loading measurements (Azofeifa et al indirectly infer loading in situ via resistivity and transmission spectra) 27 .…”

Section: Introductionmentioning

confidence: 99%

“…Further, none of referenced studies include direct in situ loading measurements (Azofeifa et al indirectly infer loading in situ via resistivity and transmission spectra). 27 By addressing all of the above issues in this work, we present a complete, uniform set of measurements that can be used to compare the optical properties of five different metal thin films (Pd, Mg, Zr, Ti, and V) before, during, and after hydrogenation. We pair this data with simultaneously recorded measurements of the metal/hydrogen atom ratio using a custom environmental chamber incorporating a quartz crystal microbalance (QCM).…”

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confidence: 99%

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Dynamic Optical Properties of Metal Hydrides

et al. 2018

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Metal hydrides often display dramatic changes in optical properties upon hydrogenation. These shifts make them prime candidates for many tunable optical devices, such as optical hydrogen sensors and switchable mirrors. While some of these metals, such as palladium, have been well studied, many other promising materials have only been characterized over a limited optical range and lack direct in situ measurements of hydrogen loading, limiting their potential applications. Further, there have been no systematic studies that allow for a clear comparison between these metals. In this work, we present such a systematic study of the dynamically tunable optical properties of Pd, Mg, Zr, Ti, and V throughout hydrogenation with a wavelength range of 250 -1690 nm. These measurements were performed in an environmental chamber, which combines mass measurements via a quartz crystal microbalance with ellipsometric measurements in up to 7 bar of hydrogen gas, allowing us to determine the optical properties during hydrogen loading. In addition, we demonstrate a further tunability of the optical properties of titanium and its hydride by altering annealing conditions, and we investigate the optical and gravimetric hysteresis that occurs during hydrogenation cycling of palladium. Finally, we demonstrate several nanoscale optical and plasmonic structures based on these dynamic properties. We show structures that, upon hydrogenation, demonstrate five orders of magnitude change in reflectivity, resonance shifts of >200 nm, and relative transmission switching of >3000%, suggesting a wide range of applications.

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Section: Resultssupporting

confidence: 82%

Section: V/vhxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Dynamic Optical Properties of Metal Hydrides

et al. 2018

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“…16 In Pd alloys, Pd hydrogenation may easily result in a proximity effect on the functional materials underneath. 17,18 This fundamentally critical effect is applicable in future techniques. In Pd nanostructures, the high ratio of surface atoms to volume atoms may substantially reduce the duration of hydrogenation processes, including dissociation, absorption, and desorption.…”

Section: Introductionmentioning

confidence: 99%

Critical hydrogenation effect on magnetic coercivity of perpendicularly magnetized Co/Pd multilayer nanostructures

Lin¹,

Tsai

Liu

et al. 2014

Journal of Applied Physics

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Low dimensional materials of perpendicularly magnetized [Co(0.5 nm)/Pd(3 nm)] multilayer, including continuous thin film, nanodots and nanodot-chains were prepared for the investigation of reversible hydrogenation effect on the magnetic and optical properties. For the continuous film, after hydrogenation the magnetic coercivity (H c) was enhanced by 47% and the Kerr intensity was significantly reduced to 10% of the pristine value. In nanodots, hydrogenation led to 25% reduction of H c and Kerr intensity as well. For nanodot-chains, the shape of magnetic hysteresis loop was modulated by hydrogenation. The hydrogenation and desorption completed within few seconds in nanodots. V

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