Optical properties of Rh, Pd, Ir, and Pt

Weaver, J. H.

doi:10.1103/physrevb.11.1416

Cited by 247 publications

(136 citation statements)

References 54 publications

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“…In bulk, the influence of H absorption on the Pd electronic structure has been thoroughly analyzed [22,23,25,24,26]. Hydrogen absorption reduces the width of the Pd valence d-band and induces new electronic states at energies just below the bottom of the band.…”

Section: Introductionmentioning

confidence: 99%

Tuning the plasmon energy of palladium–hydrogen systems by varying the hydrogen concentration

Silkin

Muiño

Chernov

et al. 2012

J. Phys.: Condens. Matter

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Abstract. First principles calculations are performed to obtain the dielectric function and loss spectra of bulk PdH x . Hydrogen concentrations between x = 0 and x = 1 are considered. The calculated spectra are dominated by a broad peak that redshifts in energy with x. The obtained bulk dielectric function is employed to compute the loss spectra of PdH x spherical nanoparticles as a function of x. The dominant plasmon peak in the spherical nanoparticle is lowered in energy with respect to the bulk case. However, the dependence of the resonance energy on the hydrogen concentration is roughly similar to that in bulk.

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Section: Introductionmentioning

confidence: 99%

Tuning the plasmon energy of palladium–hydrogen systems by varying the hydrogen concentration

Silkin

Muiño

Chernov

et al. 2012

J. Phys.: Condens. Matter

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“…0.85, 0.70 and 0.50 at 1064, 532 and 266 nm, respectively). [42][43][44] The non-reflected laser radiation penetrates into the Pt target a distance (optical depth) inversely proportional to the absorption coefficient. The optical depths of Pt are of ca.…”

Section: Ablation Process and Nanoparticle Growth Mechanismsmentioning

confidence: 99%

Platinum Nanoparticles as Photoactive Substrates for Mass Spectrometry and Spectroscopy Sensors

et al. 2014

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Aqueous suspensions of platinum colloidal nanoparticles of varying size and polydispersity have been produced by ablation of a platinum target with a nanosecond Q-switched Nd:YAG laser. Several laser wavelengths (1064, 532 and 266 nm) and stabilizing agents (citrate and polymers PEG, PVA and PVP) were employed. Laser ablation with the infrared and visible wavelengths leads to spherical amorphous nanoparticles with a bimodal distribution of diameters, featuring a global maximum in the range 5-10 nm and a shoulder extending to 25 nm. Such bimodal distributions plausibly arise from thermal and explosive vaporization mechanisms occurring in different time scales, as proposed in earlier studies.Ultraviolet ablation of Pt at 266 nm, reported here for the first time, produces crystalline nanoparticles of small size (1-4 nm diameter), with a weak onset of larger particles (6-8 nm). The ablation at 266 nm also produced an appreciable yield of large rod-like particles of size ∼ 10 x 70 nm 2 , especially in the presence of PEG and PVA. The Pt nanoparticles served to fabricate films capable of assisting the laser desorption ionization (LDI) of a model peptide. The best analytical performance for LDI mass spectrometric detection was obtained with Pt nanoparticles surface functionalized with citrate and PVA.

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“…In comparison, noncoinage transition metals have historical precedence as excellent catalysts, yet are generally considered poor plasmonic metals, because they suffer from large nonradiative damping, which results in broad spectral features and weak absorption across the visible region of the spectrum (16)(17)(18). Many catalytic transition metal nanoparticles (Pt, Pd, Rh, Ru, etc.)…”

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confidence: 99%

Heterometallic antenna−reactor complexes for photocatalysis

Swearer

Zhao

Zhou

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

413

548

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Metallic nanoparticles with strong optically resonant properties behave as nanoscale optical antennas, and have recently shown extraordinary promise as light-driven catalysts. Traditionally, however, heterogeneous catalysis has relied upon weakly light-absorbing metals such as Pd, Pt, Ru, or Rh to lower the activation energy for chemical reactions. Here we show that coupling a plasmonic nanoantenna directly to catalytic nanoparticles enables the light-induced generation of hot carriers within the catalyst nanoparticles, transforming the entire complex into an efficient light-controlled reactive catalyst. In Pd-decorated Al nanocrystals, photocatalytic hydrogen desorption closely follows the antenna-induced local absorption cross-section of the Pd islands, and a supralinear power dependence strongly suggests that hot-carrier-induced desorption occurs at the Pd island surface. When acetylene is present along with hydrogen, the selectivity for photocatalytic ethylene production relative to ethane is strongly enhanced, approaching 40:1. These observations indicate that antenna−reactor complexes may greatly expand possibilities for developing designer photocatalytic substrates.plasmon | photocatalysis | nanoparticle | catalysis | aluminum I ndustrial processes depend extensively on heterogeneous catalysts for chemical production and mitigation of environmental pollutants. These processes often rely on metal nanoparticles dispersed into high surface area support materials to both maximize catalytically active surface area and for the most cost-effective use of expensive catalysts such as Pd, Pt, Ru, or Rh (1, 2). However, catalytic processes utilizing transition metal nanoparticles are often energyintensive, relying on high temperatures and pressures to maximize catalytic activity. A transition from extreme, high-temperature conditions to low-temperature activation of catalytically active transition metal nanoparticles could have widespread impact, substantially reducing the current energy demands of heterogeneous catalysis.Light-driven chemical transformations offer an attractive and ultimately sustainable alternative to traditional high-temperature catalytic reactions. Metallic plasmonic nanostructures are a new paradigm in photoactive heterogeneous catalysts (3-6). Plasmonic nanoparticles uniquely couple electron density with electromagnetic radiation, leading to a collective oscillation of the conduction electrons in resonance with the frequency of incident light, known as a localized surface plasmon resonance (LSPR). These resonances lead to enhanced light absorption in an area much larger than the physical cross-section of the nanoparticle, and such optical antenna effects result in strongly enhanced electromagnetic fields near the nanoparticle surface. An LSPR can be damped through radiative reemission of a photon, or nonradiative Landau damping with the creation of energetic "hot" carriers: electrons above the Fermi energy of the metal and/or holes below the Fermi energy. In this context, "hot" refers to carri...

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Optical properties of Rh, Pd, Ir, and Pt

Cited by 247 publications

References 54 publications

Tuning the plasmon energy of palladium–hydrogen systems by varying the hydrogen concentration

Tuning the plasmon energy of palladium–hydrogen systems by varying the hydrogen concentration

Platinum Nanoparticles as Photoactive Substrates for Mass Spectrometry and Spectroscopy Sensors

Heterometallic antenna−reactor complexes for photocatalysis

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