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Using scanning tunneling microscopy, we show that Si deposition on Pt(111) at300K leads to a network of one-dimensional Si chains. On the bare Pt(111)surface, the chains, embedded into the Pt surface, are orientated along the<112>-direction. They disappear within a few hours in ultrahigh vacuum due tothe presence of residual gas. Exposing the chains to different gasesdeliberately reveals that CO is largely responsible for the disappearance ofthe chains. The chains can be stabilized by a monolayer of hexagonal boronnitride, which is deposited prior to the Si deposition. The resulting Si chainsare rotated by 30{\deg} with respect to the chains on the bare Pt(111) surfaceand survive even an exposure to air for 10 minutes.

One-dimensional Si chains embedded in Pt(111)and protected by a hexagonal boron-nitride monolayer