scholarly journals Plasmonic Au–Pd Bimetallic Nanocatalysts for Hot-Carrier-Enhanced Photocatalytic and Electrochemical Ethanol Oxidation

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 226
Author(s):  
Jonathan Boltersdorf ◽  
Asher C. Leff ◽  
Gregory T. Forcherio ◽  
David R. Baker
Keyword(s):  
Chemical Reactions ◽  
Low Temperatures ◽  
Suspended Particle ◽  
Bond Cleavage ◽  
Carbon Monoxide Poisoning ◽  
Pd Nanoparticles ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
Gaseous Products ◽  
Bimetallic Nanocatalysts

Gold–palladium (Au–Pd) bimetallic nanostructures with engineered plasmon-enhanced activity sustainably drive energy-intensive chemical reactions at low temperatures with solar simulated light. A series of alloy and core–shell Au–Pd nanoparticles (NPs) were prepared to synergistically couple plasmonic (Au) and catalytic (Pd) metals to tailor their optical and catalytic properties. Metal-based catalysts supporting a localized surface plasmon resonance (SPR) can enhance energy-intensive chemical reactions via augmented carrier generation/separation and photothermal conversion. Titania-supported Au–Pd bimetallic (i) alloys and (ii) core–shell NPs initiated the ethanol (EtOH) oxidation reaction under solar-simulated irradiation, with emphasis toward driving carbon–carbon (C–C) bond cleavage at low temperatures. Plasmon-assisted complete oxidation of EtOH to CO2, as well as intermediary acetaldehyde, was examined by monitoring the yield of gaseous products from suspended particle photocatalysis. Photocatalytic, electrochemical, and photoelectrochemical (PEC) results are correlated with Au–Pd composition and homogeneity to maintain SPR-induced charge separation and mitigate the carbon monoxide poisoning effects on Pd. Photogenerated holes drive the photo-oxidation of EtOH primarily on the Au-Pd bimetallic nanocatalysts and photothermal effects improve intermediate desorption from the catalyst surface, providing a method to selectively cleave C–C bonds.

Surface Plasmon Resonant Gold-Palladium Bimetallic Nanoparticles for Promoting Catalytic Oxidation

MRS Advances ◽  
2019 ◽  
Vol 4 (33-34) ◽  
pp. 1877-1886 ◽  
Author(s):  
Jonathan Boltersdorf ◽  
Asher C. Leff ◽  
Gregory T. Forcherio ◽  
Joshua P. McClure ◽  
Cynthia A. Lundgren
Keyword(s):  
Surface Plasmon ◽  
Photocatalytic Oxidation ◽  
Bimetallic Nanoparticles ◽  
Bond Cleavage ◽  
Pd Nanoparticles ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Gaseous Products ◽  
Core Shell Nanoparticles

AbstractColloidal gold-palladium (Au-Pd) bimetallic nanoparticles were used as catalysts to study the ethanol (EtOH) photo-oxidation cycle, with an emphasis towards driving carbon-carbon (C-C) bond cleavage at low temperatures. Au-Pd bimetallic alloy and core-shell nanoparticles were prepared to synergistically couple a plasmonic absorber (Au) with a catalytic metal (Pd) with composite optical and catalytic properties tailored towards promoting photocatalytic oxidation. Catalysts utilizing metals that exhibit localized surface plasmon resonance (SPR) can be harnessed for light-driven enhancement for small molecule oxidation via augmented photocarrier generation/separation and photothermal conversion. The coupling of Au to Pd in an alloy or core-shell nanostructure maintains SPR-induced charge separation, mitigates the poisoning effects on Pd, and allows for improved EtOH oxidation. The Au-Pd nanoparticles were coupled to semiconducting titanium dioxide photocatalysts to probe their effects on plasmonically-assisted photocatalytic oxidation of EtOH. Complete oxidation of EtOH to CO2 under solar simulated-light irradiation was confirmed by monitoring the yield of gaseous products. Bimetallics provide a pathway for driving desired photocatalytic and photoelectrochemical reactions with superior catalytic activity and selectivity.

Non-Equilibrium Properties of Au-Pd Nanoparticles

2011 ◽  
Vol 172-174 ◽  
pp. 670-675 ◽  
Author(s):  
Ivailo S. Atanasov ◽  
Marc Hou
Keyword(s):  
Molecular Dynamics ◽  
Low Temperatures ◽  
Pd Nanoparticles ◽  
Core Shell ◽  
Embedded Atom ◽  
Cluster Morphology ◽  
Pd Clusters ◽  
Atom Potential ◽  
The Way

We address the question of the evolution of a nanostructured system in a metastable state to equilibrium. To this purpose, we use the case study of the transition of an AucorePdshell nanoalloy cluster containing up to about 600 atoms toward the equilibrium Au segregated configuration. We start from a molecular dynamics approach with an embedded atom potential. The way the transition develops at low temperatures is found to be very sensitive to the cluster morphology and the way energy is exchanged with the environment. The transition of icosahedral inverse core-shell Au-Pd clusters is predicted to nucleate locally at the surface contrary to clusters with other morphologies, and starting at lower temperatures compared to them.

Interfacial design of gold/silver core-shell nanostars for plasmon enhanced photocatalytic coupling of 4-aminothiophenol

2021 ◽  
Author(s):  
Tapasi Sen ◽  
Gagandeep Kaur ◽  
Swati Tanwar ◽  
Vishaldeep Kaur ◽  
Rathindranath Biswas ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Chemical Reactions ◽  
Localized Surface Plasmon Resonance ◽  
Research Field ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
Mild Conditions ◽  
Gold Silver ◽  
Silver Core

Abstract Chemical reactions under mild conditions mediated by localized surface plasmon resonance (LSPR) of metals have been emerged as a functional research field. In the present study, we report an...

scholarly journals Light-Scattering Simulations from Spherical Bimetallic Core–Shell Nanoparticles

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 359
Author(s):  
Francesco Ruffino
Keyword(s):  
Optical Properties ◽  
Light Scattering ◽  
Bimetallic Nanoparticles ◽  
Dominant Role ◽  
Scattered Light ◽  
Specific Interaction ◽  
Surface Enhanced Raman Spectroscopy ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
The Core

Bimetallic nanoparticles show novel electronic, optical, catalytic or photocatalytic properties different from those of monometallic nanoparticles and arising from the combination of the properties related to the presence of two individual metals but also from the synergy between the two metals. In this regard, bimetallic nanoparticles find applications in several technological areas ranging from energy production and storage to sensing. Often, these applications are based on optical properties of the bimetallic nanoparticles, for example, in plasmonic solar cells or in surface-enhanced Raman spectroscopy-based sensors. Hence, in these applications, the specific interaction between the bimetallic nanoparticles and the electromagnetic radiation plays the dominant role: properties as localized surface plasmon resonances and light-scattering efficiency are determined by the structure and shape of the bimetallic nanoparticles. In particular, for example, concerning core-shell bimetallic nanoparticles, the optical properties are strongly affected by the core/shell sizes ratio. On the basis of these considerations, in the present work, the Mie theory is used to analyze the light-scattering properties of bimetallic core–shell spherical nanoparticles (Au/Ag, AuPd, AuPt, CuAg, PdPt). By changing the core and shell sizes, calculations of the intensity of scattered light from these nanoparticles are reported in polar diagrams, and a comparison between the resulting scattering efficiencies is carried out so as to set a general framework useful to design light-scattering-based devices for desired applications.

Facile one-pot photosynthesis of stable Ag@graphene oxide nanocolloid core@shell nanoparticles with sustainable localized surface plasmon resonance properties

2017 ◽  
Vol 5 (38) ◽  
pp. 10016-10022 ◽  
Author(s):  
Young-Kwan Kim ◽  
Seongchan Kim ◽  
Sung-Pyo Cho ◽  
Hongje Jang ◽  
Hyun Huh ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Surface Plasmon Resonance ◽  
Photochemical Reaction ◽  
Localized Surface Plasmon Resonance ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
One Pot ◽  
Resonance Properties ◽  
Core Shell Nanoparticles

Stable Ag@graphene oxide nanocolloid (GON) core–shell nanoparticles were synthesized by photochemical reaction.

Extinction Coefficient of Plasmonic Nickel Sulfide Nanocrystals and Gold-Nickel Sulfide Core-Shell Nanoparticles

2018 ◽  
Vol 233 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Rasmus Himstedt ◽  
Dominik Hinrichs ◽  
Dirk Dorfs
Keyword(s):  
Extinction Coefficient ◽  
Nickel Sulfide ◽  
Molar Extinction Coefficient ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
Electromagnetic Spectrum ◽  
Shell Nanoparticles ◽  
Extinction Coefficients ◽  
Optical Applications ◽  
Core Shell Nanoparticles

Abstract In the presented work, the molar extinction coefficient of plasmonic heazlewoodite (Ni3S2) nanoparticles and Au-Ni3S2 core-shell nanoparticles is determined for the first time. The results are compared to analogously determined extinction coefficients of pure Au nanocrystals (NCs), which themselves correlate very well with existing literature on the subject. The measured extinction coefficients at the localized surface plasmon resonance (LSPR) maximum wavelength of nickel sulfide particles are similar to the values of equally sized Au NCs. Therefore, considering the lower cost of the heazlewoodite material, it could be a reasonable alternative for optical applications of nanoparticles showing a LSPR in the visible regime of the electromagnetic spectrum. Furthermore, this study shows, that by growing a Ni3S2 shell onto a pure Au nanocrystal a highly tuneable optical material with variable LSPR frequency and molar extinction coefficient is obtained.

scholarly journals Tuning of Localized Surface Plasmon Resonance in Copper-Copper Oxide Core-Shell Quantum Dots for the Application in Biosensors

2020 ◽  
Author(s):  
Prabhash Prasannan Geetha ◽  
Ajith Ramachandran ◽  
Swapna S. Nair
Keyword(s):  
Quantum Dots ◽  
Surface Plasmon Resonance ◽  
Copper Oxide ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Particle Diameter ◽  
Noble Metal Nanoparticles ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
Chemical Route

Surface Plasmon Resonance (SPR) is an attracting property of certain transition metals when they are synthesized in nano-range giving rise to promising optical applications. However, most SPR and associated applications are limited to the noble metal nanoparticles, which limits their potential due to high production cost. We report surface plasmon resonance in copper-copper oxide core-shell quantum dots synthesized via chemical route studied by using UV-Visible spectrophotometry. Tuning of the plasmonic resonance with respect to the particle diameter is achieved by an inexpensive all chemical route. Photoluminescence measurements also support the data. This size reduction leads to remarkable changes in its optical response as compared to the bulk metal. The results point towards applications of these materials in tunable SPR based biosensors.

Influence of dimensionality and crystallization on visible-light hydrogen production of Au@TiO2 core–shell photocatalysts based on localized surface plasmon resonance

2018 ◽  
Vol 8 (4) ◽  
pp. 1094-1103 ◽  
Author(s):  
Bing Liu ◽  
Yan Jiang ◽  
Yin Wang ◽  
Shuxia Shang ◽  
Yuanman Ni ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Surface Plasmon Resonance ◽  
Hydrogen Production ◽  
Visible Light ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Localized Surface Plasmon Resonance ◽  
Localized Surface Plasmon ◽  
Core Shell

We synthesized four Au@TiO2 nanostructures, which exhibit dimensionality- and crystallinity-dependent photocatalytic activity towards H2 generation.

Facilitating the C–C bond cleavage on sub-10 nm concavity-tunable Rh@Pt core–shell nanocubes for efficient ethanol electrooxidation

2019 ◽  
Vol 7 (30) ◽  
pp. 17987-17994 ◽  
Author(s):  
Pingting Li ◽  
Kai Liu ◽  
Jinyu Ye ◽  
Fei Xue ◽  
Yong Cheng ◽  
...  
Keyword(s):  
Bond Cleavage ◽  
Core Shell ◽  
Ethanol Electrooxidation ◽  
Atomic Steps

Concavity-tunable Rh@Pt core–shell nanocubes with an engineered Rh–Pt interface and Pt atomic steps facilitate C–C bond cleavage in the EOR.

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