Seminár z fyziky kondenzovaných látok - Viktor Šroba (21.5.2026)

vo štvrtok 21.5.2026 o 14:00 v posluchárni F1 108

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Prednášajúci: Viktor Šroba (Linköping University, Švédsko)

Názov: Goldene - Single-atom Layer Gold: Prospects for Novel Noble Metallenes

Termín: 21.5.2026, 14:00 hod., F1/108

Abstrakt:
Synthesis of monolayer gold has been limited to a few atomic layers stabilized on or inside another material. The bonding nature of metals is the root cause to gold’s tendency to take 3D shapes during all kinds of synthesis, like vapor-phase deposition or precipitation from solutions.

However, in 2024, it was demonstrated that free-standing atomically thin 2D sheets of gold, named goldene, can be exfoliated by wet-chemically etching away Ti₃C₂ layers from Ti₃AuC₂ nano-laminated MAX-phase. [1] Ti₃AuC₂ is realized by substituting the Si layer in Ti3SiC2 thin films with Au during high temperature annealing, intercalation, due to eutectic nature of the Au-Si phase diagram. [2] Goldene sheets are then obtained by etching utilizing diluted form of the Murakami’s reagent with surfactant schemes are applied to prevent goldene sheets from coalescing with each other in water suspension.

So far only few analytical techniques were used to investigate the properties of goldene. Free-standing goldene sheets observed scanning transmission electron microscopy showed a tendency for curling and agglomeration of goldene, However, ab initio molecular dynamics simulation shows that flat atomic goldene layers are inherently stable. Other than that X-ray photoelectron spectroscopy reveals an Au 4f binding energy increase of 0.88 eV. [1]

Proposed applications for goldene include sensors and photocatalyst for water splitting during solar energy harvesting. The use of Au resources would be minimized due to the ultimate surface-area-to-volume ratio for goldene.

Isolated three-atomic-layer Au sheets – trilayer goldene – was recently reported by us by selectively removing the Ti₄C₃ sheets from Ti₄Au₃C₃, formed by Au-intercalated Ti₄SiC₃ thin films. [3] Moreover, efforts to isolate other noble metals as for example Ir, Pd, Pt, Rh etc. are well on the way.

[1] Kashiwaya, S., Shi, Y., Lu, J. et al. Synthesis of goldene comprising single-atom layer gold. Nat. Synth 3, 744–751 (2024)

[2] Fashandi, H., Dahlqvist, M., Lu, J. et al. Synthesis of Ti₃AuC₂, Ti₃Au₂C₂ and Ti₃IrC₂ by noble metal substitution reaction in Ti₃SiC₂ for high-temperature-stable Ohmic contacts to SiC. Nature Mater 16, 814–818 (2017)

[3] Shi, Y et al., Synthesis of Ti₄Au₃C₃ and its derivative trilayer goldene through chemical exfoliation.Sci. Adv.11, eadt7999 (2025)

 

 

 

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