Rapid microwave synthesis and optical activity of highly crystalline platinum nanocubes

Chin, Clare Davis‐Wheeler; Akbarian‐Tefaghi, Sara; Reconco-Ramirez, Juana

doi:10.1557/mrc.2017.137

Cited by 17 publications

(18 citation statements)

References 34 publications

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“…The constancy of E0 and the oscillator strength of the LSPR are noteworthy: they establish that the LSP consists exclusively of the free Au(sp) electrons. Since the collective LSPR of Pt occurs near 215 nm, [107][108][109] its decoupling from the visible LSP of Au is not surprising. The e-h pair excitations in the Pt shell, as with the e-h pairs created over the sp←d interband transitions of the Au core, do not contribute to the collective charge density of the plasmon, which constitutes the screening response of free carriers to an external field.…”

Section: Resultsmentioning

confidence: 99%

Efficient Plasmon-Mediated Energy Funneling to the Surface of Au@Pt Core–Shell Nanocrystals

et al. 2020

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The structure and ultrafast photodynamics of ~8 nm Au@Pt core-shell nanocrystals with ultrathin (<3 atomic layers) Pt-Au alloy shells are investigated to show that they meet the design principles for efficient bimetallic plasmonic photocatalysis. Photoelectron spectra recorded at two different photon energies are used to determine the radial concentration profile of the Pt-Au shell and the electron density near the Fermi energy, which play a key role in plasmon damping and electronic and thermal conductivity. Transient absorption measurements track the flow of energy from the plasmonic core to the electronic manifold of the Pt shell and back to the lattice of the core in the form of heat. We show that strong coupling to the high density of Pt(d) electrons at the Fermi level leads to accelerated dephasing of the Au plasmon on the femtosecond timescale, electron-electron energy transfer from Au(sp) core electrons to Pt(d) shell electrons on sub-picosecond timescale, and enhanced thermal resistance on the 50 ps timescale. Electron-electron scattering efficiently funnels hot carriers into the ultrathin catalytically active shell at the nanocrystal surface, making them available to drive chemical reactions before losing energy to the lattice via electron-phonon scattering on the 2 ps timescale. The combination of strong broadband light absorption, enhanced electromagnetic fields at the catalytic metal sites, and efficient delivery of hot carriers to the catalyst surface make core-shell nanocrystals with plasmonic metal cores and ultrathin catalytic metal shells promising nanostructures for the realization of high-efficiency plasmonic catalysts.

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Section: Resultsmentioning

confidence: 99%

Efficient Plasmon-Mediated Energy Funneling to the Surface of Au@Pt Core–Shell Nanocrystals

et al. 2020

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“…Risk reduction (health and safety) [2] Automation [9] Scalability (experimental→batch) [10] Experimental parameters Mild reaction conditions [1] Reduced reaction times [4] Precise temperature control [11] In-situ temperature and pressure monitoring [12] Lack of thermal gradients [8] Colloidal catalyst NPs Smaller size distribution [13] Spontaneous nucleation event [14] Homogeneous nucleation and growth [14] Prevention of agglomeration [7] Catalyst nanocomposites Intricate nanocomposite production [15] Monodispersed products [16] Elucidation of formation mechanisms [6] Repeatability [17] Uniform heat distribution improves product yields [18]…”

Section: General Operationmentioning

confidence: 99%

“…MW heating methods for producing high-quality, shape-controlled catalyst NPs have been reported, but remain limited in comparison to metal oxide and chalcogenide NPs [7]. Since it is well documented that the formation of Pt NPs is extremely sensitive to changes in temperature, the greater degree of control offered by microwave heating allows a much greater tunability of both NP size and shape [44,49].…”

Section: Nanoscale Platinum Catalystsmentioning

confidence: 99%

“…The key advantage of MW irradiation was its promotion of uniform volumetric heating, which enabled a spontaneous and homogeneous nucleation event. This eliminated the need to induce nucleation using toxic and highly reactive Fe(CO) 5 , and created a facile synthetic pathway to faceted Pt NPs [7].…”

Section: Mw Synthesis Of Catalyst Nanoparticlesmentioning

confidence: 99%

“…The rapid heating provided by MW irradiation has allowed the development of facile synthetic routes that eliminate or greatly mitigate complex, time-intensive processing, high temperature demand, and the use of dangerous nucleation-inducing agents such as metal carbonyls [6,7]. Furthermore, MW conditions have been shown to induce specific interactions between precursors, surfactants, intermediate species, and the incident electromagnetic field; these interactions enable production of NP compositions and morphologies that are not achievable using conventional heating methods [8].…”

Section: Introductionmentioning

confidence: 99%

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Microwave Synthetic Routes for Shape-Controlled Catalyst Nanoparticles and Nanocomposites

Chin

Treadwell

2021

Molecules

Self Cite

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The use of microwave irradiation for the synthesis of inorganic nanomaterials has recently become a widespread area of research that continues to expand in scope and specialization. The growing demand for nanoscale materials with composition and morphology tailored to specific applications requires the development of facile, repeatable, and scalable synthetic routes that offer a high degree of control over the reaction environment. Microwave irradiation provides unique advantages for developing such routes through its direct interaction with active reaction species, which promotes homogeneous heat distribution, increased reaction rates, greater product quality and yield, and use of mild reaction conditions. Many catalytic nanomaterials such as noble metal nanoparticles and intricate nanocomposites have very limited synthetic routes due to their extreme temperature sensitivity and difficulty achieving homogeneous growth. This work presents recent advances in the use of MW irradiation methods to produce high-quality nanoscale composites with controlled size, morphology, and architecture.

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Controllable Surfactant‐free Synthesis of Colloidal Platinum Nanocuboids Enabled by Bromide Ions and Carbon Monoxide

et al. 2022

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Pt nanoparticles enclosed by Pt{100} facets show unique properties in electrocatalysis. However, a convenient, costeffective, controllable and scalable synthesis of surface clean Pt colloidal nanocuboids remains a big challenge. In this work, small platinum nanocubes with controllable size ranging from 3.4 to 7.1 nm and nanocuboids with tuneable length-to-width aspect ratios were synthesized under the 10 %CO/90 %He atmosphere, by controlling the proportion of KBr and Pt precursors and the concentration of the platinum precursor in ethylene glycol. The exposed Pt{100} terrace sites of the synthesize materials were not only identified by the transmission electron microscopic images but also by the electrochemical adsorption/desorption of hydrogen during cyclic voltammograms. In addition, the exposed Pt{100} domains were quantitatively measured by the electrochemical adsorption/ desorption of germanium, proving the formation of nanocuboids. Finally, the synthesized Pt nanocubes were applied to the oxygen reduction reaction and the electrochemical oxidation of methanol, showing a big potential in electrocatalysis.[a] Z.

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Rapid microwave synthesis and optical activity of highly crystalline platinum nanocubes

Abstract: Abstract

Cited by 17 publications

References 34 publications

Efficient Plasmon-Mediated Energy Funneling to the Surface of Au@Pt Core–Shell Nanocrystals

Efficient Plasmon-Mediated Energy Funneling to the Surface of Au@Pt Core–Shell Nanocrystals

Microwave Synthetic Routes for Shape-Controlled Catalyst Nanoparticles and Nanocomposites

Controllable Surfactant‐free Synthesis of Colloidal Platinum Nanocuboids Enabled by Bromide Ions and Carbon Monoxide

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