Shape-engineered silver nanocones for refractive index plasmonic nanosensors

Liang, Hongyan; Ren, Hao; Guo, Yangzhe; Fang, Yurui

doi:10.1364/ol.44.003713

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…To promote the formation of high-valent metal sites, doping with redox inactive metal ions is considered as an effective method which enables the modulation of the chemical state of the parent metal to lower the formation energy for the metal–O bond. ,− This fact inspired us to try a strategy for generation of high-valent transition-metal sites through embedding guest cations with different redox activity. Copper, as the model guest metal, is considered in this study because of its higher Lewis acidity compared to Ni (the parent metal). , It has high conductivity and similar crystal structures, plasmonic properties, and electronic structures as Au and Ag. − However, the homogeneous doping of Cu is very challenging because of its tendency to aggregation, thus limiting the promotive effect to the formation of desired high-valent metal sites. − …”

Section: Introductionmentioning

confidence: 99%

High-Valent Nickel Promoted by Atomically Embedded Copper for Efficient Water Oxidation

et al. 2020

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Efficient and low-cost electrocatalysts for oxygen evolution reaction (OER), particularly in neutral conditions, are of significant importance for renewable energy technologies such as CO2 reduction and seawater splitting electrolysis. High-valent transition-metal sites have been considered as OER active sites; however, the rational design and construction of these sites remain a big challenge. Here, we report a trimetallic NiFeCu oxyhydroxide electrocatalyst, in which high-valent Ni sites are promoted and stabilized by the atomically embedded Cu, as evidenced by X-ray photoelectron spectroscopy and X-ray absorption spectroscopy. Through compositional optimization, Ni6Fe1Cu1 catalysts achieved an overpotential of 385 mV at 10 mA cm–2, a Tafel slope of 164 mV dec–1, and a stability of 100 h at pH = 7.2. Density function theory calculations demonstrated that the Cu-doping facilitates the formation of high-valent Ni and thus promotes OER electrocatalysis through modulating the d-band center of Ni and reducing the adsorption energy of oxygenated intermediates on the surface of the catalyst. This work paves a promising avenue for the construction of desired high-valent metal OER catalysts by embedding redox inactive metals.

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Section: Introductionmentioning

confidence: 99%

High-Valent Nickel Promoted by Atomically Embedded Copper for Efficient Water Oxidation

et al. 2020

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“…Fractal geometry describes a structure with exact or quasi-self-similarity. , In nature, there are various fractal-like architectures, such as snowflakes, tree branches, and corals. Stimulated by this concept, plasmonic fractals were investigated because they can introduce tunable multiband resonances and expand the spectral region of their strong optical response, overcoming the limitation of the narrow spectral domain in conventional plasmonic antennas. , Despite the successful implementation of fractals in plasmonic applications such as terahertz resonators, , optical antennas, , nonlinear optics, , surface-enhanced Raman scattering (SERS), − energy harvesting, and photodetection, , there are still several major obstacles in utilizing them for photocatalysis: (i) sophisticated fabrication methods based on the use of expensive methods, such as focused ion beam lithography, electron beam lithography, and direct laser writing, is impractical for photocatalysis, which typically requires freestanding NPs instead of plates attached on substrates and scalable production; (ii) the spatial origin of the broad-band response and hotspots, and their relevance with the geometry are not adequately revealed; and (iii) the investigation of hot electron generation at the single-particle level during the photochemical reaction process remains challenging.…”

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confidence: 99%

Self-Constructed Multiple Plasmonic Hotspots on an Individual Fractal to Amplify Broadband Hot Electron Generation

et al. 2021

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Plasmonic nanoparticles are ideal candidates for hot-electron-assisted applications, but their narrow resonance region and limited hotspot number hindered the energy utilization of broadband solar energy. Inspired by tree branches, we designed and chemically synthesized silver fractals, which enable self-constructed hotspots and multiple plasmonic resonances, extending the broadband generation of hot electrons for better matching with the solar radiation spectrum. We directly revealed the plasmonic origin, the spatial distribution, and the decay dynamics of hot electrons on the single-particle level by using ab initio simulation, dark-field spectroscopy, pump–probe measurements, and electron energy loss spectroscopy. Our results show that fractals with acute tips and narrow gaps can support broadband resonances (400–1100 nm) and a large number of randomly distributed hotspots, which can provide unpolarized enhanced near field and promote hot electron generation. As a proof-of-concept, hot-electron-triggered dimerization of p-nitropthiophenol and hydrogen production are investigated under various irradiations, and the promoted hot electron generation on fractals was confirmed with significantly improved efficiency.

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“…A comprehensive experimental and theoretical investigation of the geometric effect in photocatalytic performance is important for the mechanism understanding and structure design [16][17][18]. Herein, we applied photocurrent response from microscale reaction region to evaluate the influence of plasmonic morphology on photocatalysis.…”

Section: Introductionmentioning

confidence: 99%