Electrochemical conditioning via chronopotentiometry (CP) and cyclic voltammetry (CV) is essential for the activation of oxygen evolution reaction (OER) electrocatalysts. While many reports have activated OER electrocatalysts using either CP or CV, inherent differences between these two electrochemical methods electrocatalytic materials yet to be explored. Here, we investigate effects CV on a Ni-based precatalyst substrate in Fe-purified Fe-unpurified KOH electrolytes by employing (i) Ni...

Collective plasmon resonances in superlattice assemblies of metallic nanoparticles are influenced by nanoparticle attributes and assembly structure. Although grain boundaries other structural defects inherent to superlattices assembled the laboratory, their impact on near- far-field optical properties remains poorly understood. Here, we study variations model two-dimensional spherical nanoparticles, focusing large-scale monolayers approximately constant area fraction formed different rates....

Plasmon polaritons created by coupling optical cavity modes with plasmonic resonances offer widely tunable frequencies and strong light-matter interaction. While metallic nanocrystals (NCs) are compelling building blocks, existing approaches for their photonic integration not scalable, limiting systematic study potential applications. Here, we assemble colloidal tin-doped indium oxide NCs in a straightforward Salisbury screen configuration to realize an 'open' structure, where the infrared...

Lead-free piezoelectric thick films of (K0.5Na0.5)NbO3 were fabricated by aerosol-deposition method. The thickness KNN film was 7.1μm and fully dense obtained. dielectric constants ε3T∕ε0 the as-deposited annealed at 1kHz 116 545, respectively, which are higher than any previously reported values for lead-free thin/thick films, either without or with heat treatment. ferroelectric properties improved after annealing maximum Pr=8.1μC∕cm3 Ec=100kV∕cm achieved. These markedly superior to those...

Optical properties of nanoparticle assemblies reflect distinctive characteristics their building blocks and spatial organization, giving rise to emergent phenomena. Integrated experimental computational studies have established design principles connecting the structure for assembled clusters superlattices. However, conventional electromagnetic simulations are too computationally expensive treat more complex assemblies. Here we establish a fast, materials agnostic method simulate optical...

Assembling plasmonic nanocrystals in regular superlattices can produce effective optical properties not found homogeneous materials. However, the range of these metamaterial is limited when a single nanocrystal composition selected for constituent meta-atoms. Here, we show how continuously varying doping at two length scales, atomic and enables tuning both frequency bandwidth collective plasmon resonance nanocrystal-based metasurfaces, while features are inextricably linked single-component...

The ability to efficiently absorb light in ultrathin (subwavelength) layers is essential for modern electro-optic devices, including detectors, sensors, and nonlinear modulators. Tailoring these films' spectral, spatial, polarimetric properties highly desirable many, if not all, of the above applications. Doing so, however, often requires costly lithographic techniques or exotic materials, limiting scalability. Here we propose, demonstrate, analyze a mid-infrared absorber architecture...

A synthetic challenge in faceted metal oxide nanocrystals (NCs) is realizing tunable localized surface plasmon resonance (LSPR) near-field response the infrared (IR). Cube-shaped nanoparticles of noble metals exhibit LSPR spectral tunability limited to visible range. Here, we describe colloidal synthesis fluorine, tin codoped indium (F,Sn:In2O3) NC cubes with IR range for around 10 nm particle sizes. Free carrier concentration tuned through controlled Sn dopant incorporation, where an...

Abstract Exposure of soft material templates to alternating volatile chemical precursors can produce inorganic deposition within the permeable template (e.g. a polymer thin film) in process akin atomic layer (ALD). While such sequential infiltration synthesis (SIS) processes have now been demonstrated for many metal oxides, we report an SIS transition sulfide – CdS. Gas phase dimethyl cadmium and hydrogen infiltrated into poly(4‐vinylpyridine) films result 3D‐nucleation clusters consistent...

Exposure of soft material templates to alternating volatile chemical precursors can produce inorganic deposition within the permeable template (e.g. a polymer thin film) in process akin atomic layer (ALD). While such sequential infiltration synthesis (SIS) processes have now been demonstrated for many metal oxides, we report an SIS transition sulfide - CdS. Gas phase dimethyl cadmium and hydrogen infiltrated into poly(4-vinylpyridine) films result 3D-nucleation clusters consistent with...

Plasmon polaritons created by coupling optical cavity modes with plasmonic resonances offer widely tunable frequencies and strong light–matter interaction. While metallic nanocrystals (NCs) are compelling building blocks, existing approaches for their photonic integration not scalable, limiting systematic study potential applications. Here, we assemble colloidal tin-doped indium oxide NCs in a straightforward Salisbury screen configuration to realize an 'open' structure, where the infrared...

Owing to their novel optical properties, three-dimensional plasmonic nanostructures with reduced symmetry such as a nanocrescent and nanocup have attracted considerable current interest in biophotonic imaging sensing. However, practical applications been still limited since the colloidal synthesis of structures that allows, principle, for vivo application large-scale production has not explored yet. To date, these fabricated only on two-dimensional substrates using micro/nanofabrication...

A wide range of material properties can be accessed by tuning the size and shape nanocrystals (NCs). Cations incorporated into crystal lattice indium oxide (In2O3) NCs as dopants have been shown to impact electronic, optical, magnetic also sometimes influence NC shape, but effects nonincorporative cations not investigated. In this work, we found that alkali greatly affect In2O3 NCs. particular, addition sodium ions in reactant mixture significantly increases induces a rhombic dodecahedral...

The energetically favorable formation of atomically precise clusters, known as magic size in the solution phase enables a precision nanoscale synthesis with exquisite uniformity. We report clusters via vapor infiltration atomic layer deposition precursors directly polymer thin film. Sequential trimethylindium and hydrogen sulfide gas into poly(methyl methacrylate) leads to uniform properties consistent cluster─In6S6(CH3)6. While an increase cluster might be expected additional sequential...

Crystallographic defects are essential to the functional properties of semiconductors, controlling everything from conductivity optical and catalytic activity. In nanocrystals, too, defect engineering with extrinsic dopants has been fruitful. Although intrinsic like vacancies can be equally useful, synthetic strategies for their generation comparatively underdeveloped. Here, we show that concentration tuned during synthesis colloidal metal oxide nanocrystals by addition salts. not...

The ability to efficiently absorb light in ultrathin subwavelength) layers is essential for modern electro-optic devices, including detectors, sensors, and nonlinear modulators. Tailoring these films’ spectral, spatial, polarimetric properties highly desirable many, if not all, of the above applications. Doing so, however, often requires costly lithographic techniques or exotic materials, limiting scalability. Here we propose, demonstrate, analyze a mid-infrared absorber architecture...

A closer look: The growth mechanism of nanoparticles is difficult to elucidate by common UV/Vis and TEM methods, owing ensemble averaging 2D projection effects. Single-particle scattering spectra were now used investigate the overgrowth gold on gold/polystyrene nanoparticles. Three patterns are readily differentiated, corresponding mechanisms proposed. Detailed facts importance specialist readers published as ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or...

Optical properties of nanoparticle assemblies reflect the distinctive characteristics their building blocks and spatial organization, giving rise to emergent phenomena. Design functional like clusters superlattices has progressed through integrated experimental computational studies establishing principles connecting structure properties. However, conventional electromagnetic simulation methods are computationally expensive inadequate for treating more complex assemblies, such as gels mixed...

Collective plasmon resonances in superlattice assemblies of metallic nanoparticles are influenced by nanoparticle attributes and assembly structure. Although grain boundaries other structural defects inherent to superlattices assembled the lab, their impact on near- far-field optical properties remains poorly understood. Here, we study variations model 2D spherical nanoparticles, focusing large-scale monolayers approximately constant area fraction formed different rates. Our modeling...

Genau hingeschaut: Gewöhnliche UV/Vis- und TEM-Methoden sind wegen Ensemblemittelungen Projektionseffekten wenig geeignet, den Mechanismus des Nanopartikelwachstums aufzuklären. Einzelpartikelbeugungsspektren wurden nun genutzt, um das Aufwachsen von Gold auf Gold/Polystyrol-Nanopartikeln zu untersuchen. Drei Muster lassen sich klar unterscheiden, entsprechende Wachstumsmechanismen werden vorgeschlagen. Detailed facts of importance to specialist readers are published as ”Supporting...

Proton-based aqueous electrolytes can be used to achieve high performance electrochromic nanocrystal thin films due their small ion size. However, acidic electrolyte systems have not yet been explored in near-infrared (NIR) absorbing plasmonic tungsten oxide films. Here, we demonstrate suboxide nanorod with excellent visible and NIR modulation the H+-based electrolytes, thanks mesoporous structure, nanosized domains, open tunnel structure. Colloidally synthesized WO2.83 nanorods an average...

Proton-based aqueous electrolytes can be used to achieve high performance electrochromic nanocrystal thin films due their small ion size. However, acidic electrolyte systems have not yet been explored in near-infrared (NIR) absorbing plasmonic tungsten oxide films. Here, we demonstrate suboxide nanorod with excellent visible and NIR modulation the H

Energetically favorable formation of atomically precise clusters, known as magic-size clusters from solution phase synthesis are studied extensively enlightening their unique properties and consecutive nucleation growth mechanism to bulk structures. However, those vapor comparatively underdeveloped, especially for the metal chalcogenide materials. Here we report that sequential infiltration enables indium sulfide clusters. Based on experimental computational study, found reaction between...