The concept of accumulation-mediated concentration is translated to the nano-/ microscale to achieve in situ unified synthesis and structuring of immiscible nanoalloys. The confinement effect, high fluid flow, and site-specific heating at a laser-induced microbubble trap (MBT) results in one-shot RhAu alloying and structuring. Random walk simulations reveal enhanced millisecond-timescale concentration of ions in the MBT. The synthesized and structured RhAu nanoalloys demonstrate enhanced catalytic activity. Our generic strategy can be easily scaled up toward various catalytic and optoelectronic applications.

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