Tailoring the Morphology and Fractal Dimension of 2D Mesh‐like Gold Gels

Hiekel, Karl; Jungblut, Swetlana; Georgi, Maximilian; Eychmüller, Alexander

doi:10.1002/anie.202002951

Cited by 23 publications

(35 citation statements)

References 46 publications

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“…Moreover, the 2D mesh-like Au hydrogels were synthesized via the phase boundary gelation method (Figure 6c). 51 Here, the aqueous solution with Au NPs was mixed with another organic solution mixture (ethanol/ toluene). Ethanol acts as a media that conveys the Au NPs into another phase, because the ethanol is soluble in both solvents.…”

Section: Gelation Mechanisms Investigationmentioning

confidence: 99%

Noble Metal Aerogels

Wang

Fang

et al. 2020

ACS Appl. Mater. Interfaces

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Noble metal-based nanomaterials have been a hot research topic during the past few decades. Particularly, self-assembled porous architectures have triggered tremendous interest. At the forefront of porous nanostructures, there exists a research endeavor of noble metal aerogels (NMAs), which are unique in terms of macroscopic assembly systems and three-dimensional (3D) porous network nanostructures. Combining excellent features of noble metals and the unique structural traits of porous nanostructures, NMAs are of high interest in diverse fields, such as catalysis, sensors, and self-propulsion devices. Regardless of these achievements, it is still challenging to rationally design well-tailored NMAs in terms of ligament sizes, morphologies, and compositions and profoundly investigate the underlying gelation mechanisms. Herein, an elaborate overview of the recent progress on NMAs is given. First, a simple description of typical synthetic methods and some advanced design engineering are provided, and then, the gelation mechanism models of NMAs are discussed in detail. Furthermore, promising applications particularly focusing on electrocatalysis and biosensors are highlighted. In the final section, brief conclusions and an outlook on the existing challenges and future chances of NMAs are also proposed.

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Section: Gelation Mechanisms Investigationmentioning

confidence: 99%

Noble Metal Aerogels

Wang

Fang

et al. 2020

ACS Appl. Mater. Interfaces

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“…We therefore attribute the suppression of LSPs in these networks also to a (de-structive) wave interference effect ultimately canceling the dominant dipolar coupling between various hot spots above a certain frequency (determined by the previously noted increasing "intrinsic" impact of disorder in this plasmonic AL system). This disappearance of localized modes above the threshold at the lower end of the optical spectrum explains the exceptionally large transparencies up to 97 % (in optical frequency range 443 THz -635 THz) of the Au networks [20].…”

Section: Anderson Localizationmentioning

confidence: 85%

“…2D Au networks of varying fractal dimension and coverage (0.310 -0.544) have been synthesized following the procedures described in Ref. [20]. Following the initial synthesis step and after the evaporation of the organic solvent the networks were transferred to a TEM-grid by carefully pressing the substrate onto the aqueous solution.…”

Section: Methodsmentioning

confidence: 99%

“…S1 for an example) is analogous to the literature. [20] At first, the Au NPs were synthesized. Therefore, 0.1 mmol HAuCl 4 •3H 2 O (Sigma-Aldrich > 99.9 % trace metal basis) was dissolved in 492 ml water and solutions (volumes 2 till 4 ml) of 0.143 mmol/ml NaBH 4 (Sigma-Aldrich, > 96 %) were swiftly added and everything was stirred for 30 min.…”

Section: Fig S1 Transmission Electron Microscopy Image Of An Exemplar...mentioning

confidence: 99%

“…Very recently, the development of a novel synthesis route allowed for the synthesis of large scale 2D Au networks with significantly reduced mass thickness (compared to the semicontinuous metal films), deliberately tunable coverage and fractal dimension [20], thereby overcoming some of the above limitations. In the following, we experimentally demonstrate the emergence of disorder-driven LSP resonances in this novel type of Au networks.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Maximal Anderson Localization and Suppression of Surface Plasmons in Two-Dimensional Random Au Networks

Schultz¹,

Hiekel²,

Potapov³

et al. 2021

Preprint

Self Cite

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2D random metal networks possess unique electrical and optical properties, such as almost hundred percent optical transparencies and low sheet resistance, which are closely related to their disordered structure and may be exploited in various applications. Here we present a detailed experimental and theoretical investigation of their plasmonic properties, revealing Anderson (disorder-driven) localized surface plasmon (LSP) resonances of very large quality factors and spatial localization close to the theoretical maximum. The LSPs typically consist of multiple field hotspots with a welldefined correlation distance and couple to electromagnetic plane waves. Moreover, they disappear above a geometry-dependent threshold at ca. 1.6 eV in the investigated networks, explaining their large transparencies in the optical spectrum.

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Fractal Growth of 2D NbSe₂ for Broadband Nonlinear Optical Limiting

Wang,

Ma,

Wang

et al. 2024

Adv Funct Materials

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The compelling demand for laser protection both for civil and defense use calls for new‐generation nonlinear optical materials. Chemical vapor deposition (CVD) techniques provide extra tricks to modulate crystal optical nonlinearity through fractal growth. The synthesized 2D NbSe2 and its fractal structures exhibit giant, broadband laser attenuation behaviors extending into the near Infrared (NIR) range. Particularly, the optical limiting performance generally correlates with the fractal dimension, where Fractal NbSe2 demonstrates enhanced third‐order optical nonlinearity at a huge nonlinear absorption coefficient of 9.7 × 10−4 m W−1 and an ultralow starting threshold of 5 mJ cm−2 at 532 nm. Various techniques include femtosecond spectroscopy, Density functional theory (DFT) calculation and Kelvin probe force microscopy disclose the origin of the strong nonlinearity of the 2D NbSe2 crystals, and suggest the formation of edge states and overall faster carrier dynamics, larger surface contact potential difference NbSe2 fractals contribute to their even augmented nonlinear responses. Fractal engineering thus opens new avenues to fabricate highly efficient laser protection materials, and the blocking of intense beam (a large attenuation factor over 13.3 dB at 532 nm) while allowing transmission of weak one (a high linear optical transmittance over 80%) fulfills the much desired “smart” defense.

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Tailoring the Morphology and Fractal Dimension of 2D Mesh‐like Gold Gels

Cited by 23 publications

References 46 publications

Noble Metal Aerogels

Noble Metal Aerogels

Maximal Anderson Localization and Suppression of Surface Plasmons in Two-Dimensional Random Au Networks

Fractal Growth of 2D NbSe₂ for Broadband Nonlinear Optical Limiting

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Tailoring the Morphology and Fractal Dimension of 2D Mesh‐like Gold Gels

Cited by 23 publications

References 46 publications

Noble Metal Aerogels

Noble Metal Aerogels

Maximal Anderson Localization and Suppression of Surface Plasmons in Two-Dimensional Random Au Networks

Fractal Growth of 2D NbSe2 for Broadband Nonlinear Optical Limiting

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Fractal Growth of 2D NbSe₂ for Broadband Nonlinear Optical Limiting