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.

scholarly journals In Situ Enhanced Raman and Photoluminescence of Bio-Hybrid Ag/Polymer Nanoparticles by Localized Surface Plasmon for Highly Sensitive DNA Sensors

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 631 ◽  
Author(s):  
Seokho Kim ◽  
Bo-Hyun Kim ◽  
Young Ki Hong ◽  
Chunzhi Cui ◽  
Jinho Choi ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Self Assembly ◽  
Hybrid Nanoparticles ◽  
Localized Surface Plasmon ◽  
Raman Signal ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Enhanced Photoluminescence ◽  
Target Dna ◽  
Core Shell Nanoparticles

We experimentally demonstrate the simultaneous enhancement of Raman and photoluminescence (PL) of core-shell hybrid nanoparticles consisting of Ag (core) and polydiacetylene (PDA, shell) through the assistance of localized surface plasmon (LSP) effect for the effective biosensor. Core-shell nanoparticles (NPs) are fabricated in deionized water through a sequential process of reprecipitation and self-assembly. The Raman signal of PDA on core-shell NPs is enhanced more than 100 times. Also, highly enhanced photoluminescence is observed on Ag/PDA hybrid NPs after coupling of the complementary t-DNA with p-DNA which are immobilized on PDA shell. This indicates that the core Ag affects the Raman and PL of PDA through the LSP resonance, which can be caused by the energy and/or charge transfer caused by the LSP coupling and the strong electromagnetic field near Ag NP surface. Only electrons present on the surface interact with the PDA shell, not involving the electrically neutral part of the electrons inside the Ag NP. Furthermore, this work shows that as prepared Ag/PDA NPs functionalized by probe DNA can sense the target DNA with an attomolar concentration (100 attomole).

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.

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