Gold black and gold cermet absorbing surfaces

McKenzie, David R.

doi:10.1007/bf03215450

Cited by 8 publications

(2 citation statements)

References 21 publications

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“…Bottom-up approaches include gold smoke deposits, [7] femtosecond laser ablation of metals, [8] and plasmonic colloidosomes. [9] The strong and broad absorption in these systems is due to the interparticle near-field interaction between NP aggregates with random size distribution.…”

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confidence: 99%

Tunable Black Gold: Controlling the Near‐Field Coupling of Immobilized Au Nanoparticles Embedded in Mesoporous Silica Capsules

ElKabbash

Sousa‐Castillo

Nguyen

et al. 2017

Advanced Optical Materials

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Increasing the efficiency and cost effectiveness of solar energy generators allowed them to compete with traditional carbonbased energy sources in many energy markets worldwide. However, a major problem facing the proliferation of solar energy generation is energy storage. On one hand, photovoltaic generators enjoy relatively high efficiency but suffer from high electric energy storage costs. On the other hand, concentrated solar power plants collect and store heat and dispatch electricity at lower storage costs but with less efficiency compared to photovoltaics. To address these problems, hybrid solar converters were proposed to optimally exploit the high efficiency of photovoltaics and low costs of solar energy storage. [1] To realize such Efficient light-to-heat conversion is central for various applications such as thermo-photovoltaics and solar steam generation. Although metals can strongly absorb light and generate heat, their free electrons shield the electric field before any substantial penetration in the metal. Excitation of surface plasmons can suppress metal reflection and convert it into a black metal, for example, black gold. In this work, mesoporous silica capsules grafted with immobilized Au nanoparticles (NPs) with different sizes via controlled chemical synthesis are synthesized. It is shown that changing the size of immobilized NPs modifies the interparticle coupling strength, thus, modifying the NPs absorption. The broadness of the plasmon resonance is tuned across the visible, near-infrared, and short wavelength infrared regions. The ability to control the broadness of black gold absorption is not possible in other systems based on bottom-up synthesis. The proposed approach broadens the possibilities of utilizing black gold in many applications such as thermo-photovoltaics, and solar energy harvesting especially in hybrid solar converters.

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confidence: 99%

Tunable Black Gold: Controlling the Near‐Field Coupling of Immobilized Au Nanoparticles Embedded in Mesoporous Silica Capsules

ElKabbash

Sousa‐Castillo

Nguyen

et al. 2017

Advanced Optical Materials

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“…In presence of Au 3+ , the newly formed metallic gold coalesces into colloidal dark particles with a wide range of sizes, resulting in light absorption throughout the whole optical spectrum [30].…”

Section: Spot Test For Gold In Solutionmentioning

confidence: 99%

Recovery of gold from e-waste via food waste byproducts

Cecchi¹,

Gao²,

Clément³

et al. 2022

Nanotechnology

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Global materials’ and energy constraints and environmental issues call for a holistic approach to waste upcycling. We propose a chemically rational, cost-effective and environmentally friendly recovery of non-leaching gold from e-waste using aqueous chemistry with hydrogen peroxide, an environmentally benign oxidant, and lactic acid, a food chain byproduct. The oxidation of the base metals enables the release of gold in its metallic state in the form of flakes subsequently separated via filtration. Our main byproduct is a precursor of Cu2O, a relevant metal oxide for solar energy conversion applications. The recovered gold was characterized by scanning electron microscopy, energy dispersive spectroscopy and X-ray photoelectron spectroscopy to gain insight into the morphology of the flakes and their chemical composition. Furthermore, recovered gold was used to successfully fabricate the source and drain electrodes in organic field-effect transistors.

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