Patchy nanoparticles by atomic stencilling

Chemicals

All chemicals were used without further purification after purchase: gold(III) chloride trihydrate (≥99.9% trace metals basis, HAuCl₄·3H₂O, Sigma-Aldrich), sodium borohydride (99%, NaBH₄, Sigma-Aldrich), sodium iodide (99.999%, NaI,…