Adsorption-conversion synthesis of ultrathin intermetallics and high-entropy alloys.

Adsorption-conversion growth yields diverse Fe-, Co-, Ni-, Cu-, and Pd-based ultrathin single-crystal IMCs and HEMAs, reaching conductivity up to 3×10^7 S m^-1.

• Why it matters: Two-dimensional single crystals of IMCs and HEMAs are hard to synthesize because they are thermodynamically unstable and kinetically difficult to control.
• What they did: The authors use an adsorption-conversion strategy where decomposed surface adsorbates supply metal atoms, while residual Cl atoms promote two-dimensional facet formation.
• The result: The ultrathin materials show conductivity up to 3×10^7 S m^-1 and an ultralow temperature coefficient of resistance of 2 ppm K^-1, enabling a platform to study emergent properties.

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