AuAl2 and PtAl2 as potential plasmonic materials

Keast, V. J.; Zwan, Benjamin; Supansomboon, Supitcha; Cortie, Michael B.; Persson, Per

doi:10.1016/j.jallcom.2013.06.161

Cited by 27 publications

(32 citation statements)

References 20 publications

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“…We could not resolve this question by a CALPHAD calculation because the commercially thermodynamic databases available to us did not have sufficient data yet for the calculation of this ternary system (due primarily to a lack of data for Al-Pt). On the other hand, Furrer and Spolenak [8] found experimental evidence for a continuous (Au,Pt)Al 2 solid solution, and its existence was also assumed in a recent Density Functional Theory study [10]. In contrast, microstructural evidence from other C1 systems suggests an equilibrium state of mutual immiscibility for compounds of this type.…”

Section: Introductionmentioning

confidence: 92%

“…Both are known for producing eye-catching effects in specialized jewelry [3][4][5][6][7] and they have been the subject of a comprehensive recent investigation by Furrer and Spolenak [8]. The relatively unusual dielectric functions of PtAl 2 and AuAl 2 have also been previously investigated [4,[9][10][11][12][13][14][15] and their possible application in spectrally-selective filters or plasmonic devices discussed [4,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown that materials with a C1 structure and a stoichiometry of the form Au x Pt 1-x Al 2 (0<x<1) will have a color that shifts from purple to brassy yellow, via a peach-colored intermediate, as x varies for 1 to 0 [8,10]. Of course, such a gradation of color does not only occur in a solid solution series and would also be expected in duplex microstructures of AuAl 2 and PtAl 2 .…”

Section: Introductionmentioning

confidence: 99%

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Thin films of PtAl2 and AuAl2 by solid-state reactive synthesis

et al. 2015

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The intermetallic compounds AuAl 2 and PtAl 2 are colored purple and yellow respectively. In the past they have been prepared by bulk melting techniques or by co-deposition in a magnetron sputterer. Here, however, we investigate films of AuAl 2 , PtAl 2 and (Au,Pt)Al 2 prepared by sequential physical vapor deposition of the elements, followed by in situ solid-state reaction. The microstructure, dielectric functions, optical properties and thermal stability of the resulting films are characterized and compared to those prepared by bulk melting or co-deposition. The (Au,Pt)Al 2 films show a color gamut that stretches from purple to brassy yellow depending on composition and microstructure. High temperature synchrotron X-ray diffraction experiments show that the (Au,Pt)Al 2 phase is metastable, decomposing when heated above 420 °C. In contrast, the pure AuAl 2 or PtAl 2 phases are stable to about 580 °C before they oxidize or decompose. The alternative possibility of producing the purple-to-yellow color gamut by depositing optical stacks of very thin films of AuAl 2 and PtAl 2 is also assessed. Either scheme will provide a range of colors lying between those of the binary compound endpoints. Calculations predict that deposition of AuAl 2 onto PtAl 2 will produce more intense colors than vice versa, an unexpected finding that is worth further investigation.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thin films of PtAl2 and AuAl2 by solid-state reactive synthesis

et al. 2015

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“…Finally, the LSPRs in both elements are damped by interband electronic transitions, especially at the shorter wavelengths within the visible part of the spectrum. Therefore, there has been some interest in considering other materials for LSPR applications [8][9][10][11][12][13]. Cu and Al have drawn particular attention because they share some of the physical and electronic properties of Au and Ag [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Effect of Multimodal Plasmon Resonances on the Optical Properties of Five-Pointed Nanostars

Zhu

Cortie

Blakey

2015

Nanomaterials and Nanotechnology

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The optical transmission and electric field distribution of plasmonic nanostructures dictate their performance in nano-optics and nano-biosensors. Here, we consider the use of hollow, five-pointed, star-shaped nanostructures made of Al, Ag, Au or Cu. We use simulations based on finite-difference time-domain and the discrete dipole approximation to identify the strongest plasmon resonances in these structures. In particular, we were seeking plasmon resonances within the visible part of the spectrum. The silver pentagrams exhibited the strongest such resonance, at a wavelength of about 530 nm. The visiblelight resonances of Au and Cu pentagrams were relatively weaker and red-shifted by about 50 nm. The main resonances of the Al pentagrams were in the ultra-violet. All the nanostars also showed a broad, dipolar-like resonance at about 1000 nm. Surprisingly, the maximum field intensities for the visible light modes were greatest along the flanks of the stars rather than at their tips, whereas those of the dipolar-like modes in the near-infrared were greatest at the tips of the star. These findings have practical implications for sensor design. The inclusion of a conformally hollow interior is beneficial because it provides additional 'hot spots'.

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“…In particular, ε( q, ω) provides the basis for calculating a material's electronic and optical properties, e.g. the (volume) plasma resonance [1][2][3]. In the simplest approach based on a homogeneous single-band valence-electron gas model in the optical limit ( q → 0), the eigenfrequency (plasma frequency) of these quantized collective oscillations (plasmons) is given by…”

Section: Introductionmentioning

confidence: 99%